diff --git a/.github/workflows/build_test_deploy.yml b/.github/workflows/build_test_deploy.yml
index 51d848de12dc9..3d5dce3de6011 100644
--- a/.github/workflows/build_test_deploy.yml
+++ b/.github/workflows/build_test_deploy.yml
@@ -70,10 +70,29 @@ jobs:
 
       - run: node run-tests.js --timings -g ${{ matrix.group }}/6 -c 3
 
+  testYarnPnP:
+    runs-on: ubuntu-latest
+    env:
+      NODE_OPTIONS: '--unhandled-rejections=strict'
+    steps:
+      - uses: actions/checkout@v2
+
+      - run: yarn install --frozen-lockfile --check-files
+
+      - run: |
+          mkdir -p ./e2e-tests/next-pnp
+          cp -r ./examples/with-typescript/. ./e2e-tests/next-pnp
+          cd ./e2e-tests/next-pnp
+          touch yarn.lock
+          yarn set version berry
+          yarn config set pnpFallbackMode none
+          yarn link --all --private ../..
+          yarn build
+
   testsPass:
     name: thank you, next
     runs-on: ubuntu-latest
-    needs: [lint, checkPrecompiled, testAll]
+    needs: [lint, checkPrecompiled, testAll, testYarnPnP]
     steps:
       - run: exit 0
 
diff --git a/.gitignore b/.gitignore
index faedbe2adbdd3..df46d328e8bc4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,6 +21,7 @@ coverage
 test/**/out*
 test/**/next-env.d.ts
 .DS_Store
+/e2e-tests
 
 # Editors
 **/.idea
diff --git a/docs/advanced-features/codemods.md b/docs/advanced-features/codemods.md
new file mode 100644
index 0000000000000..be387fc827f67
--- /dev/null
+++ b/docs/advanced-features/codemods.md
@@ -0,0 +1,149 @@
+---
+description: Use codemods to update your codebase when upgrading Next.js to the latest version
+---
+
+# Next.js Codemods
+
+Next.js provides Codemod transformations to help upgrade your Next.js codebase when a feature is deprecated.
+
+Codemods are transformations that run on your codebase programmatically. This allows for a large amount of changes to be applied without having to manually go through every file.
+
+## Usage
+
+`npx @next/codemod <transform> <path>`
+
+- `transform` - name of transform, see available transforms below.
+- `path` - files or directory to transform
+- `--dry` Do a dry-run, no code will be edited
+- `--print` Prints the changed output for comparison
+
+## Next.js 9
+
+### `name-default-component`
+
+Transforms anonymous components into named components to make sure they work with [Fast Refresh](https://nextjs.org/blog/next-9-4#fast-refresh).
+
+For example
+
+```jsx
+// my-component.js
+export default function () {
+  return <div>Hello World</div>
+}
+```
+
+Transforms into:
+
+```jsx
+// my-component.js
+export default function MyComponent() {
+  return <div>Hello World</div>
+}
+```
+
+The component will have a camel cased name based on the name of the file, and it also works with arrow functions.
+
+#### Usage
+
+Go to your project
+
+```
+cd path-to-your-project/
+```
+
+Run the codemod:
+
+```
+npx @next/codemod name-default-component
+```
+
+### `withamp-to-config`
+
+Transforms the `withAmp` HOC into Next.js 9 page configuration.
+
+For example:
+
+```js
+// Before
+import { withAmp } from 'next/amp'
+
+function Home() {
+  return <h1>My AMP Page</h1>
+}
+
+export default withAmp(Home)
+```
+
+```js
+// After
+export default function Home() {
+  return <h1>My AMP Page</h1>
+}
+
+export const config = {
+  amp: true,
+}
+```
+
+#### Usage
+
+Go to your project
+
+```
+cd path-to-your-project/
+```
+
+Run the codemod:
+
+```
+npx @next/codemod withamp-to-config
+```
+
+## Next.js 6
+
+### `url-to-withrouter`
+
+Transforms the deprecated automatically injected `url` property on top level pages to using `withRouter` and the `router` property it injects. Read more here: [err.sh/next.js/url-deprecated](https://err.sh/next.js/url-deprecated)
+
+For example:
+
+```js
+// From
+import React from 'react'
+export default class extends React.Component {
+  render() {
+    const { pathname } = this.props.url
+    return <div>Current pathname: {pathname}</div>
+  }
+}
+```
+
+```js
+// To
+import React from 'react'
+import { withRouter } from 'next/router'
+export default withRouter(
+  class extends React.Component {
+    render() {
+      const { pathname } = this.props.router
+      return <div>Current pathname: {pathname}</div>
+    }
+  }
+)
+```
+
+This is just one case. All the cases that are transformed (and tested) can be found in the [`__testfixtures__` directory](./transforms/__testfixtures__/url-to-withrouter).
+
+#### Usage
+
+Go to your project
+
+```
+cd path-to-your-project/
+```
+
+Run the codemod:
+
+```
+npx @next/codemod url-to-withrouter
+```
diff --git a/docs/advanced-features/preview-mode.md b/docs/advanced-features/preview-mode.md
index dd4065482248c..1e8467620cf3b 100644
--- a/docs/advanced-features/preview-mode.md
+++ b/docs/advanced-features/preview-mode.md
@@ -28,7 +28,7 @@ In the [Pages documentation](/docs/basic-features/pages.md) and the [Data Fetchi
 
 Static Generation is useful when your pages fetch data from a headless CMS. However, it’s not ideal when you’re writing a draft on your headless CMS and want to **preview** the draft immediately on your page. You’d want Next.js to render these pages at **request time** instead of build time and fetch the draft content instead of the published content. You’d want Next.js to bypass Static Generation only for this specific case.
 
-Next.js has the feature called **Preview Mode** which solves this problem. Here’s an instruction on how to use it.
+Next.js has a feature called **Preview Mode** which solves this problem. Here are instructions on how to use it.
 
 ## Step 1. Create and access a preview API route
 
diff --git a/docs/create-next-app.md b/docs/api-reference/create-next-app.md
similarity index 100%
rename from docs/create-next-app.md
rename to docs/api-reference/create-next-app.md
diff --git a/docs/api-reference/next.config.js/headers.md b/docs/api-reference/next.config.js/headers.md
index 4b854562e08e0..c066afeaf1a38 100644
--- a/docs/api-reference/next.config.js/headers.md
+++ b/docs/api-reference/next.config.js/headers.md
@@ -27,7 +27,6 @@ module.exports = {
           },
         ],
       },
-      ,
     ]
   },
 }
@@ -38,6 +37,37 @@ module.exports = {
 - `source` is the incoming request path pattern.
 - `headers` is an array of header objects with the `key` and `value` properties.
 
+## Header Overriding Behavior
+
+If two headers match the same path and set the same header key, the last header key will override the first. Using the below headers, the path `/hello` will result in the header `x-hello` being `world` due to the last header value set being `world`.
+
+```js
+module.exports = {
+  async headers() {
+    return [
+      {
+        source: '/:path*',
+        headers: [
+          {
+            key: 'x-hello',
+            value: 'there',
+          },
+        ],
+      },
+      {
+        source: '/hello',
+        headers: [
+          {
+            key: 'x-hello',
+            value: 'world',
+          },
+        ],
+      },
+    ],
+  },
+}
+```
+
 ## Path Matching
 
 Path matches are allowed, for example `/blog/:slug` will match `/blog/hello-world` (no nested paths):
@@ -59,8 +89,7 @@ module.exports = {
           },
         ],
       },
-      ,
-    ]
+    ],
   },
 }
 ```
@@ -86,8 +115,7 @@ module.exports = {
           },
         ],
       },
-      ,
-    ]
+    ],
   },
 }
 ```
@@ -109,7 +137,7 @@ module.exports = {
           },
         ],
       },
-    ]
+    ],
   },
 }
 ```
diff --git a/docs/basic-features/data-fetching.md b/docs/basic-features/data-fetching.md
index 7192803696704..e30ad46ddc251 100644
--- a/docs/basic-features/data-fetching.md
+++ b/docs/basic-features/data-fetching.md
@@ -60,7 +60,17 @@ The `context` parameter is an object containing the following keys:
 - `revalidate` - An **optional** amount in seconds after which a page re-generation can occur. More on [Incremental Static Regeneration](#incremental-static-regeneration)
 
 > **Note**: You can import modules in top-level scope for use in `getStaticProps`.
-> Imports used in `getStaticProps` will not be bundled for the client-side, as [explained below](#write-server-side-code-directly).
+> Imports used in `getStaticProps` will [not be bundled for the client-side](#write-server-side-code-directly).
+>
+> This means you can write **server-side code directly in `getStaticProps`**.
+> This includes reading from the filesystem or a database.
+
+> **Note**: You should not use [`fetch()`](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API) to
+> call an API route in your application.
+> Instead, directly import the API route and call its function yourself.
+> You may need to slightly refactor your code for this approach.
+>
+> Fetching from an external API is fine!
 
 ### Simple Example
 
@@ -534,7 +544,17 @@ The `context` parameter is an object containing the following keys:
 - `previewData`: The preview data set by `setPreviewData`. See the [Preview Mode documentation](/docs/advanced-features/preview-mode.md).
 
 > **Note**: You can import modules in top-level scope for use in `getServerSideProps`.
-> Imports used in `getServerSideProps` will not be bundled for the client-side, as [explained below](#only-runs-on-server-side).
+> Imports used in `getServerSideProps` will not be bundled for the client-side.
+>
+> This means you can write **server-side code directly in `getServerSideProps`**.
+> This includes reading from the filesystem or a database.
+
+> **Note**: You should not use [`fetch()`](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API) to
+> call an API route in your application.
+> Instead, directly import the API route and call its function yourself.
+> You may need to slightly refactor your code for this approach.
+>
+> Fetching from an external API is fine!
 
 ### Simple example
 
diff --git a/docs/basic-features/fast-refresh.md b/docs/basic-features/fast-refresh.md
index a9be9cbcb6e50..0d6040eb9050b 100644
--- a/docs/basic-features/fast-refresh.md
+++ b/docs/basic-features/fast-refresh.md
@@ -107,6 +107,6 @@ Sometimes, this can lead to unexpected results. For example, even a `useEffect`
 with an empty array of dependencies would still re-run once during Fast Refresh.
 
 However, writing code resilient to occasional re-running of `useEffect` is a good practice even
-without Fash Refresh. It will make it easier for you to introduce new dependencies to it later on
+without Fast Refresh. It will make it easier for you to introduce new dependencies to it later on
 and it's enforced by [React Strict Mode](/docs/api-reference/next.config.js/react-strict-mode),
 which we highly recommend enabling.
diff --git a/docs/getting-started.md b/docs/getting-started.md
index e07f4282363b3..77e3b7a00f05e 100644
--- a/docs/getting-started.md
+++ b/docs/getting-started.md
@@ -29,7 +29,7 @@ yarn create next-app
 
 After the installation is complete, follow the instructions to start the development server. Try editing `pages/index.js` and see the result on your browser.
 
-For more information on how to use `create-next-app`, you can review the [`create-next-app` documentation](/docs/create-next-app.md)
+For more information on how to use `create-next-app`, you can review the [`create-next-app` documentation](/docs/api-reference/create-next-app.md)
 
 ## Manual Setup
 
diff --git a/docs/manifest.json b/docs/manifest.json
index e4ff3d7a01605..0fedfb30c20b1 100644
--- a/docs/manifest.json
+++ b/docs/manifest.json
@@ -176,6 +176,10 @@
             {
               "title": "Debugging",
               "path": "/docs/advanced-features/debugging.md"
+            },
+            {
+              "title": "Codemods",
+              "path": "/docs/advanced-features/codemods.md"
             }
           ]
         },
@@ -191,6 +195,10 @@
       "heading": true,
       "routes": [
         { "title": "CLI", "path": "/docs/api-reference/cli.md" },
+        {
+          "title": "Create Next App",
+          "path": "/docs/api-reference/create-next-app.md"
+        },
         {
           "title": "next/router",
           "path": "/docs/api-reference/next/router.md"
diff --git a/errors/invalid-page-config.md b/errors/invalid-page-config.md
index 327e40d8212a9..6984a9bb1b9e5 100644
--- a/errors/invalid-page-config.md
+++ b/errors/invalid-page-config.md
@@ -6,7 +6,7 @@ In one of your pages you did `export const config` with an invalid value.
 
 #### Possible Ways to Fix It
 
-The page's config must be an object initialized directly when being exported.
+The page's config must be an object initialized directly when being exported and not modified dynamically.
 
 This is not allowed
 
@@ -14,6 +14,19 @@ This is not allowed
 export const config = 'hello world'
 ```
 
+This is not allowed
+
+```js
+const config = {}
+config.amp = true
+```
+
+This is not allowed
+
+```js
+export { config } from '../config'
+```
+
 This is allowed
 
 ```js
diff --git a/examples/blog-starter-typescript/components/cover-image.tsx b/examples/blog-starter-typescript/components/cover-image.tsx
index 7a4f635dfb521..6497d4c1bb85a 100644
--- a/examples/blog-starter-typescript/components/cover-image.tsx
+++ b/examples/blog-starter-typescript/components/cover-image.tsx
@@ -18,7 +18,7 @@ const CoverImage = ({ title, src, slug }: Props) => {
     />
   )
   return (
-    <div className="-mx-5 sm:mx-0">
+    <div className="sm:mx-0">
       {slug ? (
         <Link as={`/posts/${slug}`} href="/posts/[slug]">
           <a aria-label={title}>{image}</a>
diff --git a/examples/blog-starter-typescript/components/post-header.tsx b/examples/blog-starter-typescript/components/post-header.tsx
index 376e3860ecbac..d91161ad0cd52 100644
--- a/examples/blog-starter-typescript/components/post-header.tsx
+++ b/examples/blog-starter-typescript/components/post-header.tsx
@@ -18,7 +18,7 @@ const PostHeader = ({ title, coverImage, date, author }: Props) => {
       <div className="hidden md:block md:mb-12">
         <Avatar name={author.name} picture={author.picture} />
       </div>
-      <div className="mb-8 md:mb-16 -mx-5 sm:mx-0">
+      <div className="mb-8 md:mb-16 sm:mx-0">
         <CoverImage title={title} src={coverImage} />
       </div>
       <div className="max-w-2xl mx-auto">
diff --git a/examples/blog-starter/components/cover-image.js b/examples/blog-starter/components/cover-image.js
index b9df0f27e2354..d06a95b55ce4f 100644
--- a/examples/blog-starter/components/cover-image.js
+++ b/examples/blog-starter/components/cover-image.js
@@ -12,7 +12,7 @@ export default function CoverImage({ title, src, slug }) {
     />
   )
   return (
-    <div className="-mx-5 sm:mx-0">
+    <div className="sm:mx-0">
       {slug ? (
         <Link as={`/posts/${slug}`} href="/posts/[slug]">
           <a aria-label={title}>{image}</a>
diff --git a/examples/blog-starter/components/post-header.js b/examples/blog-starter/components/post-header.js
index 4a832420cbd27..299600d6bcd2a 100644
--- a/examples/blog-starter/components/post-header.js
+++ b/examples/blog-starter/components/post-header.js
@@ -10,7 +10,7 @@ export default function PostHeader({ title, coverImage, date, author }) {
       <div className="hidden md:block md:mb-12">
         <Avatar name={author.name} picture={author.picture} />
       </div>
-      <div className="mb-8 md:mb-16 -mx-5 sm:mx-0">
+      <div className="mb-8 md:mb-16 sm:mx-0">
         <CoverImage title={title} src={coverImage} />
       </div>
       <div className="max-w-2xl mx-auto">
diff --git a/examples/cms-agilitycms/components/cover-image.js b/examples/cms-agilitycms/components/cover-image.js
index 9bb01798efb4d..50b4bbc0922d2 100644
--- a/examples/cms-agilitycms/components/cover-image.js
+++ b/examples/cms-agilitycms/components/cover-image.js
@@ -15,7 +15,7 @@ export default function CoverImage({ title, responsiveImage, slug }) {
     />
   )
   return (
-    <div className="-mx-5 sm:mx-0">
+    <div className="sm:mx-0">
       {slug ? (
         <Link href="/[...slug]" as={`/posts/${slug}`}>
           <a aria-label={title}>{image}</a>
diff --git a/examples/cms-buttercms/components/cover-image.js b/examples/cms-buttercms/components/cover-image.js
index 7230d824f2d47..22a4852faa340 100644
--- a/examples/cms-buttercms/components/cover-image.js
+++ b/examples/cms-buttercms/components/cover-image.js
@@ -2,7 +2,7 @@ import Link from 'next/link'
 
 export default function CoverImage({ title, url, slug }) {
   return (
-    <div className="-mx-5 sm:mx-0">
+    <div className="sm:mx-0">
       {slug ? (
         <Link as={`/posts/${slug}`} href="/posts/[slug]">
           <a aria-label={title}>
diff --git a/examples/cms-contentful/components/cover-image.js b/examples/cms-contentful/components/cover-image.js
index 3263aaa0eed82..9f52f4e51c199 100644
--- a/examples/cms-contentful/components/cover-image.js
+++ b/examples/cms-contentful/components/cover-image.js
@@ -12,7 +12,7 @@ export default function CoverImage({ title, url, slug }) {
     />
   )
   return (
-    <div className="-mx-5 sm:mx-0">
+    <div className="sm:mx-0">
       {slug ? (
         <Link as={`/posts/${slug}`} href="/posts/[slug]">
           <a aria-label={title}>{image}</a>
diff --git a/examples/cms-cosmic/components/cover-image.js b/examples/cms-cosmic/components/cover-image.js
index 02f176a7851e2..a75776a691266 100644
--- a/examples/cms-cosmic/components/cover-image.js
+++ b/examples/cms-cosmic/components/cover-image.js
@@ -22,7 +22,7 @@ export default function CoverImage({ title, url, slug }) {
     />
   )
   return (
-    <div className="-mx-5 sm:mx-0">
+    <div className="sm:mx-0">
       {slug ? (
         <Link as={`/posts/${slug}`} href="/posts/[slug]">
           <a aria-label={title}>{image}</a>
diff --git a/examples/cms-datocms/components/cover-image.js b/examples/cms-datocms/components/cover-image.js
index d9f54beb0ab73..9c48efc6b9199 100644
--- a/examples/cms-datocms/components/cover-image.js
+++ b/examples/cms-datocms/components/cover-image.js
@@ -15,7 +15,7 @@ export default function CoverImage({ title, responsiveImage, slug }) {
     />
   )
   return (
-    <div className="-mx-5 sm:mx-0">
+    <div className="sm:mx-0">
       {slug ? (
         <Link as={`/posts/${slug}`} href="/posts/[slug]">
           <a aria-label={title}>{image}</a>
diff --git a/examples/cms-graphcms/components/cover-image.js b/examples/cms-graphcms/components/cover-image.js
index e1830c8286bc7..560c40d4c711b 100644
--- a/examples/cms-graphcms/components/cover-image.js
+++ b/examples/cms-graphcms/components/cover-image.js
@@ -15,7 +15,7 @@ export default function CoverImage({ title, url, slug }) {
   )
 
   return (
-    <div className="-mx-5 sm:mx-0">
+    <div className="sm:mx-0">
       {slug ? (
         <Link as={`/posts/${slug}`} href="/posts/[slug]">
           <a aria-label={title}>{image}</a>
diff --git a/examples/cms-prismic/components/cover-image.js b/examples/cms-prismic/components/cover-image.js
index 3263aaa0eed82..9f52f4e51c199 100644
--- a/examples/cms-prismic/components/cover-image.js
+++ b/examples/cms-prismic/components/cover-image.js
@@ -12,7 +12,7 @@ export default function CoverImage({ title, url, slug }) {
     />
   )
   return (
-    <div className="-mx-5 sm:mx-0">
+    <div className="sm:mx-0">
       {slug ? (
         <Link as={`/posts/${slug}`} href="/posts/[slug]">
           <a aria-label={title}>{image}</a>
diff --git a/examples/cms-sanity/components/cover-image.js b/examples/cms-sanity/components/cover-image.js
index 14a5c12342424..b92487bf39cf9 100644
--- a/examples/cms-sanity/components/cover-image.js
+++ b/examples/cms-sanity/components/cover-image.js
@@ -16,7 +16,7 @@ export default function CoverImage({ title, url, slug }) {
   )
 
   return (
-    <div className="-mx-5 sm:mx-0">
+    <div className="sm:mx-0">
       {slug ? (
         <Link as={`/posts/${slug}`} href="/posts/[slug]">
           <a aria-label={title}>{image}</a>
diff --git a/examples/cms-storyblok/components/cover-image.js b/examples/cms-storyblok/components/cover-image.js
index 7230d824f2d47..22a4852faa340 100644
--- a/examples/cms-storyblok/components/cover-image.js
+++ b/examples/cms-storyblok/components/cover-image.js
@@ -2,7 +2,7 @@ import Link from 'next/link'
 
 export default function CoverImage({ title, url, slug }) {
   return (
-    <div className="-mx-5 sm:mx-0">
+    <div className="sm:mx-0">
       {slug ? (
         <Link as={`/posts/${slug}`} href="/posts/[slug]">
           <a aria-label={title}>
diff --git a/examples/cms-strapi/components/cover-image.js b/examples/cms-strapi/components/cover-image.js
index a93d0c9c7cbd2..e59d8c7f04c94 100644
--- a/examples/cms-strapi/components/cover-image.js
+++ b/examples/cms-strapi/components/cover-image.js
@@ -5,7 +5,7 @@ export default function CoverImage({ title, url, slug }) {
     url.startsWith('/') ? process.env.NEXT_PUBLIC_STRAPI_API_URL : ''
   }${url}`
   return (
-    <div className="-mx-5 sm:mx-0">
+    <div className="sm:mx-0">
       {slug ? (
         <Link as={`/posts/${slug}`} href="/posts/[slug]">
           <a aria-label={title}>
diff --git a/examples/cms-takeshape/components/cover-image.js b/examples/cms-takeshape/components/cover-image.js
index b048c0e20ebda..dfe43d8914b02 100644
--- a/examples/cms-takeshape/components/cover-image.js
+++ b/examples/cms-takeshape/components/cover-image.js
@@ -17,7 +17,7 @@ export default function CoverImage({ title, coverImage, slug }) {
     />
   )
   return (
-    <div className="-mx-5 sm:mx-0">
+    <div className="sm:mx-0">
       {slug ? (
         <Link as={`/posts/${slug}`} href="/posts/[slug]">
           <a aria-label={title}>{image}</a>
diff --git a/examples/cms-wordpress/components/cover-image.js b/examples/cms-wordpress/components/cover-image.js
index c0d33b15f166a..9b4e781c4bcc0 100644
--- a/examples/cms-wordpress/components/cover-image.js
+++ b/examples/cms-wordpress/components/cover-image.js
@@ -11,7 +11,7 @@ export default function CoverImage({ title, coverImage, slug }) {
     />
   )
   return (
-    <div className="-mx-5 sm:mx-0">
+    <div className="sm:mx-0">
       {slug ? (
         <Link as={`/posts/${slug}`} href="/posts/[slug]">
           <a aria-label={title}>{image}</a>
diff --git a/examples/custom-server-hapi/next-wrapper.js b/examples/custom-server-hapi/next-wrapper.js
index 34040bae437cd..b178e9a6088d1 100644
--- a/examples/custom-server-hapi/next-wrapper.js
+++ b/examples/custom-server-hapi/next-wrapper.js
@@ -10,7 +10,7 @@ const pathWrapper = (app, pathName, opts) => async (
   { raw, query, params },
   h
 ) => {
-  const html = await app.renderToHTML(
+  const html = await app.render(
     raw.req,
     raw.res,
     pathName,
diff --git a/examples/ssr-caching/server.js b/examples/ssr-caching/server.js
index 333aca98bbcc0..50f67faf8487a 100644
--- a/examples/ssr-caching/server.js
+++ b/examples/ssr-caching/server.js
@@ -11,7 +11,7 @@ const handle = app.getRequestHandler()
 const ssrCache = cacheableResponse({
   ttl: 1000 * 60 * 60, // 1hour
   get: async ({ req, res }) => {
-    const data = await app.renderToHTML(req, res, req.path, {
+    const data = await app.render(req, res, req.path, {
       ...req.query,
       ...req.params,
     })
diff --git a/examples/with-filbert/.babelrc b/examples/with-filbert/.babelrc
new file mode 100644
index 0000000000000..9cc7017fb9b6c
--- /dev/null
+++ b/examples/with-filbert/.babelrc
@@ -0,0 +1,4 @@
+{
+    "presets": ["next/babel"],
+    "plugins": ["macros"]
+  }
\ No newline at end of file
diff --git a/examples/with-filbert/package.json b/examples/with-filbert/package.json
index b13949c0159cd..6acc42079e3a2 100644
--- a/examples/with-filbert/package.json
+++ b/examples/with-filbert/package.json
@@ -12,8 +12,9 @@
   "author": "Kuldeep Keshwar",
   "license": "ISC",
   "dependencies": {
-    "@filbert-js/core": "^0.0.4",
-    "@filbert-js/server-stylesheet": "^0.0.4",
+    "@filbert-js/core": "latest",
+    "@filbert-js/macro": "latest",
+    "@filbert-js/server-stylesheet": "latest",
     "next": "latest",
     "react": "^16.7.0",
     "react-dom": "^16.7.0"
diff --git a/examples/with-filbert/pages/index.js b/examples/with-filbert/pages/index.js
index aeabe9d3b618b..fb4f6eaea4901 100644
--- a/examples/with-filbert/pages/index.js
+++ b/examples/with-filbert/pages/index.js
@@ -1,11 +1,8 @@
-import { Global, styled } from '@filbert-js/core'
+import { Global, css, styled } from '@filbert-js/macro'
 
 import React from 'react'
 
-const Text = styled('div')`
-  color: hotpink;
-`
-const Heading = styled('h1')`
+const Heading = styled.h1`
   outline: none;
   text-decoration: none;
   font-weight: 300;
@@ -14,7 +11,6 @@ const Heading = styled('h1')`
   text-shadow: 0 1px 0 rgba(0, 0, 0, 0.01);
   padding: 0.4125em 1.25em;
   color: #3793e0;
-
   &:hover {
     border-bottom-color: #4682b4;
     border-bottom: 1px solid;
@@ -24,10 +20,10 @@ const Heading = styled('h1')`
     text-decoration: none;
   }
 `
-const Small = styled('div')`
+const Small = styled.div`
   color: black;
 `
-const Container = styled('div')`
+const Container = styled.div`
   display: flex;
   flex-direction: column;
   justify-content: center;
@@ -57,7 +53,11 @@ export default function Home() {
           
         `}
       />
-      <img src="/filbert.png" width="150" alt="filbert" />
+      <img
+        src="https://raw.githubusercontent.com/kuldeepkeshwar/filbert-js/master/filbert.png"
+        width="150"
+        alt="filbert"
+      />
       <Heading>
         <a target="_black" href="https://filbert-js.vercel.app/">
           {' '}
@@ -65,7 +65,13 @@ export default function Home() {
         </a>
       </Heading>
       <Small>A light weight(~1KB) css-in-js solution(framework)🎨</Small>
-      <Text>Next JS is awesome</Text>
+      <div
+        css={css`
+          color: hotpink;
+        `}
+      >
+        Nextjs is awesome
+      </div>
     </Container>
   )
 }
diff --git a/examples/with-firebase-authentication/utils/auth/useUser.js b/examples/with-firebase-authentication/utils/auth/useUser.js
index cbd58d301e342..f300fc1bbf241 100644
--- a/examples/with-firebase-authentication/utils/auth/useUser.js
+++ b/examples/with-firebase-authentication/utils/auth/useUser.js
@@ -33,7 +33,7 @@ const useUser = () => {
     // Firebase updates the id token every hour, this
     // makes sure the react state and the cookie are
     // both kept up to date
-    firebase.auth().onIdTokenChanged((user) => {
+    const cancelAuthListener = firebase.auth().onIdTokenChanged((user) => {
       if (user) {
         const userData = mapUserData(user)
         setUserCookie(userData)
@@ -50,6 +50,10 @@ const useUser = () => {
       return
     }
     setUser(userFromCookie)
+
+    return () => {
+      cancelAuthListener()
+    }
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [])
 
diff --git a/examples/with-flow/flow-typed/next.js.flow b/examples/with-flow/flow-typed/next.js.flow
index 102b81a5d5010..e5b2756d88722 100644
--- a/examples/with-flow/flow-typed/next.js.flow
+++ b/examples/with-flow/flow-typed/next.js.flow
@@ -5,9 +5,6 @@ declare module "next" {
     prepare(): Promise<void>;
     getRequestHandler(): any;
     render(req: any, res: any, pathname: string, query: any): any;
-    renderToHTML(req: any, res: any, pathname: string, query: string): string;
-    renderError(err: Error, req: any, res: any, pathname: any, query: any): any;
-    renderErrorToHTML(err: Error, req: any, res: any, pathname: string, query: any): string;
   };
   declare module.exports: (...opts: any) => NextApp
 }
diff --git a/examples/with-msw/.env b/examples/with-msw/.env
new file mode 100644
index 0000000000000..f2f2baa1e38dd
--- /dev/null
+++ b/examples/with-msw/.env
@@ -0,0 +1,4 @@
+# Enable API mocking in all environments, this is only for the sake of the example.
+# In a real app you should move this variable to `.env.development`, as mocking the
+# API should only be done for development.
+NEXT_PUBLIC_API_MOCKING="enabled"
\ No newline at end of file
diff --git a/examples/with-msw/.gitignore b/examples/with-msw/.gitignore
new file mode 100644
index 0000000000000..e3b3fe7726885
--- /dev/null
+++ b/examples/with-msw/.gitignore
@@ -0,0 +1,34 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# vercel
+.vercel
\ No newline at end of file
diff --git a/examples/with-msw/README.md b/examples/with-msw/README.md
new file mode 100644
index 0000000000000..d7c1368e462c7
--- /dev/null
+++ b/examples/with-msw/README.md
@@ -0,0 +1,29 @@
+# Mock Service Worker Example
+
+[Mock Service Worker](https://github.com/mswjs/msw) is an API mocking library for browser and Node. It provides seamless mocking by interception of actual requests on the network level using Service Worker API. This makes your application unaware of any mocking being at place.
+
+In this example we integrate Mock Service Worker with Next by following the next steps:
+
+1. Define a set of [request handlers](./mocks/handlers.js) shared between client and server.
+1. Setup a [Service Worker instance](./mocks/browser.js) that would intercept all runtime client-side requests via `setupWorker` function.
+1. Setup a ["server" instance](./mocks/server.js) to intercept any server/build time requests (e.g. the one happening in `getServerSideProps`) via `setupServer` function.
+
+Mocking is enabled using the `NEXT_PUBLIC_API_MOCKING` environment variable, which for the sake of the example is saved inside `.env` instead of `.env.development`. In a real app you should move the variable to `.env.development` because mocking should only be done for development.
+
+## Deploy your own
+
+Deploy the example using [Vercel](https://vercel.com):
+
+[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/import/project?template=https://github.com/vercel/next.js/tree/canary/examples/with-msw)
+
+## How to use
+
+Execute [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app) with [npm](https://docs.npmjs.com/cli/init) or [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/) to bootstrap the example:
+
+```bash
+npx create-next-app --example with-msw with-msw-app
+# or
+yarn create next-app --example with-msw with-msw-app
+```
+
+Deploy it to the cloud with [Vercel](https://vercel.com/import?filter=next.js&utm_source=github&utm_medium=readme&utm_campaign=next-example) ([Documentation](https://nextjs.org/docs/deployment)).
diff --git a/examples/with-msw/mocks/browser.js b/examples/with-msw/mocks/browser.js
new file mode 100644
index 0000000000000..b234fdae487ba
--- /dev/null
+++ b/examples/with-msw/mocks/browser.js
@@ -0,0 +1,4 @@
+import { setupWorker } from 'msw'
+import { handlers } from './handlers'
+
+export const worker = setupWorker(...handlers)
diff --git a/examples/with-msw/mocks/handlers.js b/examples/with-msw/mocks/handlers.js
new file mode 100644
index 0000000000000..45db9ab201b84
--- /dev/null
+++ b/examples/with-msw/mocks/handlers.js
@@ -0,0 +1,26 @@
+import { rest } from 'msw'
+
+export const handlers = [
+  rest.get('https://my.backend/book', (req, res, ctx) => {
+    return res(
+      ctx.json({
+        title: 'Lord of the Rings',
+        imageUrl: '/book-cover.jpg',
+        description:
+          'The Lord of the Rings is an epic high-fantasy novel written by English author and scholar J. R. R. Tolkien.',
+      })
+    )
+  }),
+  rest.get('/reviews', (req, res, ctx) => {
+    return res(
+      ctx.json([
+        {
+          id: '60333292-7ca1-4361-bf38-b6b43b90cb16',
+          author: 'John Maverick',
+          text:
+            'Lord of The Rings, is with no absolute hesitation, my most favored and adored book by‑far. The triology is wonderful‑ and I really consider this a legendary fantasy series. It will always keep you at the edge of your seat‑ and the characters you will grow and fall in love with!',
+        },
+      ])
+    )
+  }),
+]
diff --git a/examples/with-msw/mocks/index.js b/examples/with-msw/mocks/index.js
new file mode 100644
index 0000000000000..4ccbd9ef0e5f7
--- /dev/null
+++ b/examples/with-msw/mocks/index.js
@@ -0,0 +1,7 @@
+if (typeof window === 'undefined') {
+  const { server } = require('./server')
+  server.listen()
+} else {
+  const { worker } = require('./browser')
+  worker.start()
+}
diff --git a/examples/with-msw/mocks/server.js b/examples/with-msw/mocks/server.js
new file mode 100644
index 0000000000000..86f7d6154ac75
--- /dev/null
+++ b/examples/with-msw/mocks/server.js
@@ -0,0 +1,4 @@
+import { setupServer } from 'msw/node'
+import { handlers } from './handlers'
+
+export const server = setupServer(...handlers)
diff --git a/examples/with-msw/package.json b/examples/with-msw/package.json
new file mode 100644
index 0000000000000..4af39232c3046
--- /dev/null
+++ b/examples/with-msw/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "with-msw",
+  "version": "1.0.0",
+  "scripts": {
+    "dev": "next",
+    "build": "next build",
+    "start": "next start"
+  },
+  "license": "MIT",
+  "dependencies": {
+    "msw": "^0.20.4",
+    "next": "latest",
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1"
+  }
+}
diff --git a/examples/with-msw/pages/_app.js b/examples/with-msw/pages/_app.js
new file mode 100644
index 0000000000000..b20c39be7b767
--- /dev/null
+++ b/examples/with-msw/pages/_app.js
@@ -0,0 +1,7 @@
+if (process.env.NEXT_PUBLIC_API_MOCKING === 'enabled') {
+  require('../mocks')
+}
+
+export default function App({ Component, pageProps }) {
+  return <Component {...pageProps} />
+}
diff --git a/examples/with-msw/pages/index.js b/examples/with-msw/pages/index.js
new file mode 100644
index 0000000000000..f22c03b0b41f4
--- /dev/null
+++ b/examples/with-msw/pages/index.js
@@ -0,0 +1,43 @@
+import { useState } from 'react'
+
+export default function Home({ book }) {
+  const [reviews, setReviews] = useState(null)
+
+  const handleGetReviews = () => {
+    // Client-side request are mocked by `mocks/browser.js`.
+    fetch('/reviews')
+      .then((res) => res.json())
+      .then(setReviews)
+  }
+
+  return (
+    <div>
+      <img src={book.imageUrl} alt={book.title} width="250" />
+      <h1>{book.title}</h1>
+      <p>{book.description}</p>
+      <button onClick={handleGetReviews}>Load reviews</button>
+      {reviews && (
+        <ul>
+          {reviews.map((review) => (
+            <li key={review.id}>
+              <p>{review.text}</p>
+              <p>{review.author}</p>
+            </li>
+          ))}
+        </ul>
+      )}
+    </div>
+  )
+}
+
+export async function getServerSideProps() {
+  // Server-side requests are mocked by `mocks/server.js`.
+  const res = await fetch('https://my.backend/book')
+  const book = await res.json()
+
+  return {
+    props: {
+      book,
+    },
+  }
+}
diff --git a/examples/with-msw/public/book-cover.jpg b/examples/with-msw/public/book-cover.jpg
new file mode 100644
index 0000000000000..563fe321267e6
Binary files /dev/null and b/examples/with-msw/public/book-cover.jpg differ
diff --git a/examples/with-msw/public/mockServiceWorker.js b/examples/with-msw/public/mockServiceWorker.js
new file mode 100644
index 0000000000000..fb1c0774bf493
--- /dev/null
+++ b/examples/with-msw/public/mockServiceWorker.js
@@ -0,0 +1,228 @@
+/**
+ * Mock Service Worker.
+ * @see https://github.com/mswjs/msw
+ * - Please do NOT modify this file.
+ * - Please do NOT serve this file on production.
+ */
+/* eslint-disable */
+/* tslint:disable */
+
+const INTEGRITY_CHECKSUM = 'ca2c3cd7453d8c614e2c19db63ede1a1'
+const bypassHeaderName = 'x-msw-bypass'
+
+let clients = {}
+
+self.addEventListener('install', function () {
+  return self.skipWaiting()
+})
+
+self.addEventListener('activate', async function (event) {
+  return self.clients.claim()
+})
+
+self.addEventListener('message', async function (event) {
+  const clientId = event.source.id
+  const client = await event.currentTarget.clients.get(clientId)
+  const allClients = await self.clients.matchAll()
+  const allClientIds = allClients.map((client) => client.id)
+
+  switch (event.data) {
+    case 'INTEGRITY_CHECK_REQUEST': {
+      sendToClient(client, {
+        type: 'INTEGRITY_CHECK_RESPONSE',
+        payload: INTEGRITY_CHECKSUM,
+      })
+      break
+    }
+
+    case 'MOCK_ACTIVATE': {
+      clients = ensureKeys(allClientIds, clients)
+      clients[clientId] = true
+
+      sendToClient(client, {
+        type: 'MOCKING_ENABLED',
+        payload: true,
+      })
+      break
+    }
+
+    case 'MOCK_DEACTIVATE': {
+      clients = ensureKeys(allClientIds, clients)
+      clients[clientId] = false
+      break
+    }
+
+    case 'CLIENT_CLOSED': {
+      const remainingClients = allClients.filter((client) => {
+        return client.id !== clientId
+      })
+
+      // Unregister itself when there are no more clients
+      if (remainingClients.length === 0) {
+        self.registration.unregister()
+      }
+
+      break
+    }
+  }
+})
+
+self.addEventListener('fetch', async function (event) {
+  const { clientId, request } = event
+  const requestClone = request.clone()
+  const getOriginalResponse = () => fetch(requestClone)
+
+  // Opening the DevTools triggers the "only-if-cached" request
+  // that cannot be handled by the worker. Bypass such requests.
+  if (request.cache === 'only-if-cached' && request.mode !== 'same-origin') {
+    return
+  }
+
+  event.respondWith(
+    new Promise(async (resolve, reject) => {
+      const client = await event.target.clients.get(clientId)
+
+      if (
+        // Bypass mocking when no clients active
+        !client ||
+        // Bypass mocking if the current client has mocking disabled
+        !clients[clientId] ||
+        // Bypass mocking for navigation requests
+        request.mode === 'navigate'
+      ) {
+        return resolve(getOriginalResponse())
+      }
+
+      // Bypass requests with the explicit bypass header
+      if (requestClone.headers.get(bypassHeaderName) === 'true') {
+        const modifiedHeaders = serializeHeaders(requestClone.headers)
+        // Remove the bypass header to comply with the CORS preflight check
+        delete modifiedHeaders[bypassHeaderName]
+
+        const originalRequest = new Request(requestClone, {
+          headers: new Headers(modifiedHeaders),
+        })
+
+        return resolve(fetch(originalRequest))
+      }
+
+      const reqHeaders = serializeHeaders(request.headers)
+      const body = await request.text()
+
+      const rawClientMessage = await sendToClient(client, {
+        type: 'REQUEST',
+        payload: {
+          url: request.url,
+          method: request.method,
+          headers: reqHeaders,
+          cache: request.cache,
+          mode: request.mode,
+          credentials: request.credentials,
+          destination: request.destination,
+          integrity: request.integrity,
+          redirect: request.redirect,
+          referrer: request.referrer,
+          referrerPolicy: request.referrerPolicy,
+          body,
+          bodyUsed: request.bodyUsed,
+          keepalive: request.keepalive,
+        },
+      })
+
+      const clientMessage = rawClientMessage
+
+      switch (clientMessage.type) {
+        case 'MOCK_SUCCESS': {
+          setTimeout(
+            resolve.bind(this, createResponse(clientMessage)),
+            clientMessage.payload.delay
+          )
+          break
+        }
+
+        case 'MOCK_NOT_FOUND': {
+          return resolve(getOriginalResponse())
+        }
+
+        case 'NETWORK_ERROR': {
+          const { name, message } = clientMessage.payload
+          const networkError = new Error(message)
+          networkError.name = name
+
+          // Rejecting a request Promise emulates a network error.
+          return reject(networkError)
+        }
+
+        case 'INTERNAL_ERROR': {
+          const parsedBody = JSON.parse(clientMessage.payload.body)
+
+          console.error(
+            `\
+[MSW] Request handler function for "%s %s" has thrown the following exception:
+
+${parsedBody.errorType}: ${parsedBody.message}
+(see more detailed error stack trace in the mocked response body)
+
+This exception has been gracefully handled as a 500 response, however, it's strongly recommended to resolve this error.
+If you wish to mock an error response, please refer to this guide: https://mswjs.io/docs/recipes/mocking-error-responses\
+  `,
+            request.method,
+            request.url
+          )
+
+          return resolve(createResponse(clientMessage))
+        }
+      }
+    }).catch((error) => {
+      console.error(
+        '[MSW] Failed to mock a "%s" request to "%s": %s',
+        request.method,
+        request.url,
+        error
+      )
+    })
+  )
+})
+
+function serializeHeaders(headers) {
+  const reqHeaders = {}
+  headers.forEach((value, name) => {
+    reqHeaders[name] = reqHeaders[name]
+      ? [].concat(reqHeaders[name]).concat(value)
+      : value
+  })
+  return reqHeaders
+}
+
+function sendToClient(client, message) {
+  return new Promise((resolve, reject) => {
+    const channel = new MessageChannel()
+
+    channel.port1.onmessage = (event) => {
+      if (event.data && event.data.error) {
+        reject(event.data.error)
+      } else {
+        resolve(event.data)
+      }
+    }
+
+    client.postMessage(JSON.stringify(message), [channel.port2])
+  })
+}
+
+function createResponse(clientMessage) {
+  return new Response(clientMessage.payload.body, {
+    ...clientMessage.payload,
+    headers: clientMessage.payload.headers,
+  })
+}
+
+function ensureKeys(keys, obj) {
+  return Object.keys(obj).reduce((acc, key) => {
+    if (keys.includes(key)) {
+      acc[key] = obj[key]
+    }
+
+    return acc
+  }, {})
+}
diff --git a/examples/with-next-sitemap/README.md b/examples/with-next-sitemap/README.md
new file mode 100644
index 0000000000000..7f8bc3274e493
--- /dev/null
+++ b/examples/with-next-sitemap/README.md
@@ -0,0 +1,23 @@
+# next-sitemap example
+
+This example uses [`next-sitemap`](https://github.com/iamvishnusankar/next-sitemap) to generate a sitemap file for all pages (including all pre-rendered/static pages).
+
+`next-sitemap` allows the generation of sitemaps along with `robots.txt` and provides the feature to split large sitemaps into multiple files. Checkout the [`next-sitemap` documentation](https://github.com/iamvishnusankar/next-sitemap) to learn more.
+
+## Deploy your own
+
+Deploy the example using [Vercel](https://vercel.com):
+
+[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/import/project?template=https://github.com/vercel/next.js/tree/canary/examples/with-next-sitemap)
+
+## How to use
+
+Execute [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app) with [npm](https://docs.npmjs.com/cli/init) or [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/) to bootstrap the example:
+
+```bash
+npx create-next-app --example with-next-sitemap with-next-sitemap-app
+# or
+yarn create next-app --example with-next-sitemap with-next-sitemap-app
+```
+
+Deploy it to the cloud with [Vercel](https://vercel.com/import?filter=next.js&utm_source=github&utm_medium=readme&utm_campaign=next-example) ([Documentation](https://nextjs.org/docs/deployment)).
diff --git a/examples/with-storybook-typescript/next-env.d.ts b/examples/with-next-sitemap/next-env.d.ts
similarity index 100%
rename from examples/with-storybook-typescript/next-env.d.ts
rename to examples/with-next-sitemap/next-env.d.ts
diff --git a/examples/with-next-sitemap/next-sitemap.js b/examples/with-next-sitemap/next-sitemap.js
new file mode 100644
index 0000000000000..79a7b9c6f3b77
--- /dev/null
+++ b/examples/with-next-sitemap/next-sitemap.js
@@ -0,0 +1,12 @@
+module.exports = {
+  siteUrl: 'https://example.com',
+  generateRobotsTxt: true,
+  // optional
+  robotsTxtOptions: {
+    additionalSitemaps: [
+      'https://example.com/my-custom-sitemap-1.xml',
+      'https://example.com/my-custom-sitemap-2.xml',
+      'https://example.com/my-custom-sitemap-3.xml',
+    ],
+  },
+}
diff --git a/examples/with-next-sitemap/package.json b/examples/with-next-sitemap/package.json
new file mode 100644
index 0000000000000..3eabaec079718
--- /dev/null
+++ b/examples/with-next-sitemap/package.json
@@ -0,0 +1,21 @@
+{
+  "name": "with-next-sitemap",
+  "version": "1.0.0",
+  "license": "MIT",
+  "scripts": {
+    "dev": "next",
+    "build": "next build",
+    "start": "next start",
+    "postbuild": "next-sitemap"
+  },
+  "dependencies": {
+    "next": "latest",
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1"
+  },
+  "devDependencies": {
+    "@types/node": "14.6.0",
+    "@types/react": "^16.9.45",
+    "next-sitemap": "latest"
+  }
+}
diff --git a/examples/with-next-sitemap/pages/[dynamic].tsx b/examples/with-next-sitemap/pages/[dynamic].tsx
new file mode 100644
index 0000000000000..1847e6aba2de4
--- /dev/null
+++ b/examples/with-next-sitemap/pages/[dynamic].tsx
@@ -0,0 +1,34 @@
+import { GetStaticPaths, GetStaticProps } from 'next'
+import { useRouter } from 'next/router'
+
+const DynamicPage = () => {
+  const { query } = useRouter()
+
+  return (
+    <div>
+      <h1>Dynamic Page</h1>
+      <h2>Query: {query.dynamic}</h2>
+    </div>
+  )
+}
+
+export const getStaticProps: GetStaticProps = async () => {
+  return {
+    props: {
+      dynamic: 'hello',
+    },
+  }
+}
+
+export const getStaticPaths: GetStaticPaths = async () => {
+  return {
+    paths: [...Array(10000)].map((_, index) => ({
+      params: {
+        dynamic: `page-${index}`,
+      },
+    })),
+    fallback: false,
+  }
+}
+
+export default DynamicPage
diff --git a/examples/with-next-sitemap/pages/index.tsx b/examples/with-next-sitemap/pages/index.tsx
new file mode 100644
index 0000000000000..0b46074eb66e1
--- /dev/null
+++ b/examples/with-next-sitemap/pages/index.tsx
@@ -0,0 +1,36 @@
+import Link from 'next/link'
+
+const HelloWorld = () => (
+  <div>
+    <h1>Hello World Page</h1>
+    <ol>
+      <li>
+        <Link href="/[dynamic]" as="/page-1">
+          <a>Link to dynamic page 1</a>
+        </Link>
+      </li>
+      <li>
+        <Link href="/[dynamic]" as="/page-2">
+          <a>Link to dynamic page 2</a>
+        </Link>
+      </li>
+      <li>
+        <Link href="/[dynamic]" as="/page-3">
+          <a>Link to dynamic page 3</a>
+        </Link>
+      </li>
+      <li>
+        <Link href="/[dynamic]" as="/page-4">
+          <a>Link to dynamic page 4</a>
+        </Link>
+      </li>
+      <li>
+        <Link href="/[dynamic]" as="/page-5">
+          <a>Link to dynamic page 5</a>
+        </Link>
+      </li>
+    </ol>
+  </div>
+)
+
+export default HelloWorld
diff --git a/examples/with-storybook-typescript/tsconfig.json b/examples/with-next-sitemap/tsconfig.json
similarity index 82%
rename from examples/with-storybook-typescript/tsconfig.json
rename to examples/with-next-sitemap/tsconfig.json
index c5d53d8983d19..93a83a407c40c 100644
--- a/examples/with-storybook-typescript/tsconfig.json
+++ b/examples/with-next-sitemap/tsconfig.json
@@ -14,6 +14,6 @@
     "isolatedModules": true,
     "jsx": "preserve"
   },
-  "exclude": ["node_modules"],
-  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx"]
+  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx"],
+  "exclude": ["node_modules"]
 }
diff --git a/examples/with-storybook-typescript/.gitignore b/examples/with-reactstrap/.gitignore
similarity index 100%
rename from examples/with-storybook-typescript/.gitignore
rename to examples/with-reactstrap/.gitignore
diff --git a/examples/with-reactstrap/README.md b/examples/with-reactstrap/README.md
new file mode 100644
index 0000000000000..373166b01c1f9
--- /dev/null
+++ b/examples/with-reactstrap/README.md
@@ -0,0 +1,21 @@
+# reactstrap Example
+
+This example shows how to use Next.js with [reactstrap](https://reactstrap.github.io/).
+
+## Deploy your own
+
+Deploy the example using [Vercel](https://vercel.com):
+
+[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/import/git?s=https://github.com/vercel/next.js/tree/canary/examples/with-reactstrap)
+
+## How to use
+
+Execute [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app) with [npm](https://docs.npmjs.com/cli/init) or [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/) to bootstrap the example:
+
+```bash
+npx create-next-app --example with-reactstrap with-reactstrap-app
+# or
+yarn create next-app --example with-reactstrap with-reactstrap-app
+```
+
+Deploy it to the cloud with [Vercel](https://vercel.com/import?filter=next.js&utm_source=github&utm_medium=readme&utm_campaign=next-example) ([Documentation](https://nextjs.org/docs/deployment)).
diff --git a/examples/with-reactstrap/package.json b/examples/with-reactstrap/package.json
new file mode 100644
index 0000000000000..d70af506fdabf
--- /dev/null
+++ b/examples/with-reactstrap/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "with-reactstrap",
+  "version": "0.0.1",
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start"
+  },
+  "dependencies": {
+    "bootstrap": "^4.5.0",
+    "next": "latest",
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1",
+    "reactstrap": "^8.5.1"
+  }
+}
diff --git a/examples/with-reactstrap/pages/_app.jsx b/examples/with-reactstrap/pages/_app.jsx
new file mode 100644
index 0000000000000..bbd8269522fcb
--- /dev/null
+++ b/examples/with-reactstrap/pages/_app.jsx
@@ -0,0 +1,5 @@
+import '../styles/index.css'
+
+export default function MyApp({ Component, pageProps }) {
+  return <Component {...pageProps} />
+}
diff --git a/examples/with-reactstrap/pages/index.jsx b/examples/with-reactstrap/pages/index.jsx
new file mode 100644
index 0000000000000..86ac829e0a04c
--- /dev/null
+++ b/examples/with-reactstrap/pages/index.jsx
@@ -0,0 +1,106 @@
+import Head from 'next/head'
+import {
+  Container,
+  Row,
+  Col,
+  Button,
+  Card,
+  CardText,
+  CardTitle,
+  CardBody,
+} from 'reactstrap'
+
+export default function Home() {
+  return (
+    <Container className="md-container">
+      <Head>
+        <title>ReactJS with reactstrap</title>
+        <link rel="icon" href="/favicon-32x32.png" />
+      </Head>
+      <Container>
+        <h1>
+          Welcome to <a href="https://nextjs.org">Next.js!</a>
+        </h1>
+        <p>
+          Get started by editing <code>pages/index.js</code>
+        </p>
+        <Container>
+          <Row>
+            <Col sm="6">
+              <Card className="my-3">
+                <CardBody>
+                  <CardTitle tag="h5">Documentation</CardTitle>
+                  <CardText>
+                    Find in-depth information about Next.js features and API.
+                  </CardText>
+                  <Button color="primary" href="https://nextjs.org/docs">
+                    More &rarr;
+                  </Button>
+                </CardBody>
+              </Card>
+            </Col>
+            <Col sm="6">
+              <Card className="my-3">
+                <CardBody>
+                  <CardTitle tag="h5">Learn</CardTitle>
+                  <CardText>
+                    Learn about Next.js in an interactive course with quizzes!
+                  </CardText>
+                  <Button color="primary" href="https://nextjs.org/learn">
+                    More &rarr;
+                  </Button>
+                </CardBody>
+              </Card>
+            </Col>
+          </Row>
+          <Row>
+            <Col sm="6">
+              <Card className="my-3">
+                <CardBody>
+                  <CardTitle tag="h5">Examples</CardTitle>
+                  <CardText>
+                    Discover and deploy boilerplate example Next.js projects.
+                  </CardText>
+                  <Button
+                    color="primary"
+                    href="https://github.com/vercel/next.js/tree/master/examples"
+                  >
+                    More &rarr;
+                  </Button>
+                </CardBody>
+              </Card>
+            </Col>
+            <Col sm="6">
+              <Card className="my-3">
+                <CardBody>
+                  <CardTitle tag="h5">Deploy</CardTitle>
+                  <CardText>
+                    Instantly deploy your Next.js site to a public URL with
+                    Vercel.
+                  </CardText>
+                  <Button
+                    color="primary"
+                    href="https://vercel.com/import?filter=next.js&utm_source=github&utm_medium=example&utm_campaign=next-example"
+                  >
+                    More &rarr;
+                  </Button>
+                </CardBody>
+              </Card>
+            </Col>
+          </Row>
+        </Container>
+      </Container>
+
+      <footer className="cntr-footer">
+        <a
+          href="https://vercel.com?filter=next.js&utm_source=github&utm_medium=example&utm_campaign=next-example"
+          target="_blank"
+          rel="noopener noreferrer"
+        >
+          Powered by{' '}
+          <img src="/vercel.svg" alt="Vercel Logo" className="sml-logo" />
+        </a>
+      </footer>
+    </Container>
+  )
+}
diff --git a/examples/with-reactstrap/public/favicon-32x32.png b/examples/with-reactstrap/public/favicon-32x32.png
new file mode 100644
index 0000000000000..e3b4277bf093d
Binary files /dev/null and b/examples/with-reactstrap/public/favicon-32x32.png differ
diff --git a/examples/with-reactstrap/public/favicon.ico b/examples/with-reactstrap/public/favicon.ico
new file mode 100644
index 0000000000000..4965832f2c9b0
Binary files /dev/null and b/examples/with-reactstrap/public/favicon.ico differ
diff --git a/examples/with-reactstrap/public/vercel.svg b/examples/with-reactstrap/public/vercel.svg
new file mode 100644
index 0000000000000..fbf0e25a651c2
--- /dev/null
+++ b/examples/with-reactstrap/public/vercel.svg
@@ -0,0 +1,4 @@
+<svg width="283" height="64" viewBox="0 0 283 64" fill="none" 
+    xmlns="http://www.w3.org/2000/svg">
+    <path d="M141.04 16c-11.04 0-19 7.2-19 18s8.96 18 20 18c6.67 0 12.55-2.64 16.19-7.09l-7.65-4.42c-2.02 2.21-5.09 3.5-8.54 3.5-4.79 0-8.86-2.5-10.37-6.5h28.02c.22-1.12.35-2.28.35-3.5 0-10.79-7.96-17.99-19-17.99zm-9.46 14.5c1.25-3.99 4.67-6.5 9.45-6.5 4.79 0 8.21 2.51 9.45 6.5h-18.9zM248.72 16c-11.04 0-19 7.2-19 18s8.96 18 20 18c6.67 0 12.55-2.64 16.19-7.09l-7.65-4.42c-2.02 2.21-5.09 3.5-8.54 3.5-4.79 0-8.86-2.5-10.37-6.5h28.02c.22-1.12.35-2.28.35-3.5 0-10.79-7.96-17.99-19-17.99zm-9.45 14.5c1.25-3.99 4.67-6.5 9.45-6.5 4.79 0 8.21 2.51 9.45 6.5h-18.9zM200.24 34c0 6 3.92 10 10 10 4.12 0 7.21-1.87 8.8-4.92l7.68 4.43c-3.18 5.3-9.14 8.49-16.48 8.49-11.05 0-19-7.2-19-18s7.96-18 19-18c7.34 0 13.29 3.19 16.48 8.49l-7.68 4.43c-1.59-3.05-4.68-4.92-8.8-4.92-6.07 0-10 4-10 10zm82.48-29v46h-9V5h9zM36.95 0L73.9 64H0L36.95 0zm92.38 5l-27.71 48L73.91 5H84.3l17.32 30 17.32-30h10.39zm58.91 12v9.69c-1-.29-2.06-.49-3.2-.49-5.81 0-10 4-10 10V51h-9V17h9v9.2c0-5.08 5.91-9.2 13.2-9.2z" fill="#000"/>
+</svg>
\ No newline at end of file
diff --git a/examples/with-reactstrap/styles/index.css b/examples/with-reactstrap/styles/index.css
new file mode 100644
index 0000000000000..1583ab2eee329
--- /dev/null
+++ b/examples/with-reactstrap/styles/index.css
@@ -0,0 +1,26 @@
+/* ensure all pages have Bootstrap CSS */
+@import '~bootstrap/dist/css/bootstrap.min.css';
+
+.md-container {
+  max-width: 800px;
+  padding-top: 2rem;
+}
+
+.sml-card {
+  width: 22rem;
+  margin: 1rem 0;
+}
+
+.cntr-footer {
+  height: 80px;
+  margin-top: 20px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border-top: 1px solid #ccc;
+}
+
+.sml-logo {
+  height: 1em;
+  margin-left: 10px;
+}
diff --git a/examples/with-sentry/next.config.js b/examples/with-sentry/next.config.js
index 21f6635917c7f..272fef9c62884 100644
--- a/examples/with-sentry/next.config.js
+++ b/examples/with-sentry/next.config.js
@@ -62,6 +62,7 @@ module.exports = withSourceMaps({
         new SentryWebpackPlugin({
           include: '.next',
           ignore: ['node_modules'],
+          stripPrefix: ['webpack://_N_E/'],
           urlPrefix: '~/_next',
           release: COMMIT_SHA,
         })
diff --git a/examples/with-storybook-typescript/.storybook/addons.js b/examples/with-storybook-typescript/.storybook/addons.js
deleted file mode 100644
index 402ccc13eba33..0000000000000
--- a/examples/with-storybook-typescript/.storybook/addons.js
+++ /dev/null
@@ -1,2 +0,0 @@
-import '@storybook/addon-actions/register'
-import '@storybook/addon-links/register'
diff --git a/examples/with-storybook-typescript/.storybook/config.js b/examples/with-storybook-typescript/.storybook/config.js
deleted file mode 100644
index e01335c2f110a..0000000000000
--- a/examples/with-storybook-typescript/.storybook/config.js
+++ /dev/null
@@ -1,25 +0,0 @@
-import { configure, addParameters } from '@storybook/react'
-
-addParameters({
-  options: {
-    storySort: (a, b) => {
-      // We want the Welcome story at the top
-      if (a[1].kind === 'Welcome') {
-        return -1
-      }
-
-      // Sort the other stories by ID
-      // https://github.com/storybookjs/storybook/issues/548#issuecomment-530305279
-      return a[1].kind === b[1].kind
-        ? 0
-        : a[1].id.localeCompare(b[1].id, { numeric: true })
-    },
-  },
-})
-
-// automatically import all files ending in *.stories.(ts|tsx)
-const req = require.context('../stories', true, /.stories.tsx?$/)
-
-// the first argument can be an array too, so if you want to load from different locations or
-// different extensions, you can do it like this: configure([req1, req2], module)
-configure(req, module)
diff --git a/examples/with-storybook-typescript/.storybook/main.js b/examples/with-storybook-typescript/.storybook/main.js
deleted file mode 100644
index a9f47cffb9cfc..0000000000000
--- a/examples/with-storybook-typescript/.storybook/main.js
+++ /dev/null
@@ -1,3 +0,0 @@
-module.exports = {
-  addons: ['@storybook/preset-typescript'],
-}
diff --git a/examples/with-storybook-typescript/README.md b/examples/with-storybook-typescript/README.md
deleted file mode 100644
index c37520be320b1..0000000000000
--- a/examples/with-storybook-typescript/README.md
+++ /dev/null
@@ -1,52 +0,0 @@
-# Example app with Storybook and TypeScript.
-
-This example shows a default set up of Storybook plus TypeScript, using [@storybook/preset-typescript](https://github.com/storybookjs/presets/tree/master/packages/preset-typescript). Also included in the example is a custom component included in both Storybook and the Next.js application.
-
-## How to use
-
-### Using `create-next-app`
-
-Execute [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app) with [npm](https://docs.npmjs.com/cli/init) or [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/) to bootstrap the example:
-
-```bash
-npx create-next-app --example with-storybook-typescript with-storybook-app
-# or
-yarn create next-app --example with-storybook-typescript with-storybook-app
-```
-
-### Download manually
-
-Download the example:
-
-```bash
-curl https://codeload.github.com/vercel/next.js/tar.gz/canary | tar -xz --strip=2 next.js-canary/examples/with-storybook-typescript
-cd with-storybook-typescript
-```
-
-Install it and run:
-
-```bash
-npm install
-npm run dev
-# or
-yarn
-yarn dev
-```
-
-## Run Storybook
-
-```bash
-npm run storybook
-# or
-yarn storybook
-```
-
-## Build Static Storybook
-
-```bash
-npm run build-storybook
-# or
-yarn build-storybook
-```
-
-You can use [Vercel](https://vercel.com/import?filter=next.js&utm_source=github&utm_medium=readme&utm_campaign=next-example) to deploy Storybook. Specify `storybook-static` as the output directory.
diff --git a/examples/with-storybook-typescript/components/index.tsx b/examples/with-storybook-typescript/components/index.tsx
deleted file mode 100644
index c9eaaf748d055..0000000000000
--- a/examples/with-storybook-typescript/components/index.tsx
+++ /dev/null
@@ -1,4 +0,0 @@
-import React from 'react'
-export default function Home() {
-  return <div>Hello World</div>
-}
diff --git a/examples/with-storybook-typescript/package.json b/examples/with-storybook-typescript/package.json
deleted file mode 100644
index 4aa78f1f1824b..0000000000000
--- a/examples/with-storybook-typescript/package.json
+++ /dev/null
@@ -1,31 +0,0 @@
-{
-  "name": "with-storybook",
-  "version": "1.0.0",
-  "main": "index.js",
-  "scripts": {
-    "dev": "next",
-    "build": "next build",
-    "start": "next start",
-    "storybook": "start-storybook -p 6006",
-    "build-storybook": "build-storybook"
-  },
-  "dependencies": {
-    "next": "latest",
-    "react": "^16.7.0",
-    "react-dom": "^16.7.0"
-  },
-  "license": "ISC",
-  "devDependencies": {
-    "@storybook/addon-actions": "5.3.19",
-    "@storybook/addon-links": "5.3.19",
-    "@storybook/addons": "5.3.19",
-    "@storybook/preset-typescript": "3.0.0",
-    "@storybook/react": "5.3.19",
-    "@types/node": "14.0.13",
-    "@types/react": "16.9.38",
-    "babel-loader": "^8.0.5",
-    "fork-ts-checker-webpack-plugin": "5.0.4",
-    "ts-loader": "7.0.5",
-    "typescript": "3.9.5"
-  }
-}
diff --git a/examples/with-storybook-typescript/pages/index.tsx b/examples/with-storybook-typescript/pages/index.tsx
deleted file mode 100644
index 37e7e01d2c642..0000000000000
--- a/examples/with-storybook-typescript/pages/index.tsx
+++ /dev/null
@@ -1,10 +0,0 @@
-import HelloWorld from '../components'
-
-export default function Home() {
-  return (
-    <div>
-      <h1>Simple Storybook Example</h1>
-      <HelloWorld />
-    </div>
-  )
-}
diff --git a/examples/with-storybook-typescript/stories/button.stories.tsx b/examples/with-storybook-typescript/stories/button.stories.tsx
deleted file mode 100644
index adcd12fa27712..0000000000000
--- a/examples/with-storybook-typescript/stories/button.stories.tsx
+++ /dev/null
@@ -1,17 +0,0 @@
-import React from 'react'
-import { action } from '@storybook/addon-actions'
-import { Button } from '@storybook/react/demo'
-
-export default { title: 'Button' }
-
-export const withText = () => (
-  <Button onClick={action('clicked')}>Hello Button</Button>
-)
-
-export const withSomeEmoji = () => (
-  <Button onClick={action('clicked')}>
-    <span role="img" aria-label="so cool">
-      😀 😎 👍 💯
-    </span>
-  </Button>
-)
diff --git a/examples/with-storybook-typescript/stories/helloWorld.stories.tsx b/examples/with-storybook-typescript/stories/helloWorld.stories.tsx
deleted file mode 100644
index 1c524fc556c66..0000000000000
--- a/examples/with-storybook-typescript/stories/helloWorld.stories.tsx
+++ /dev/null
@@ -1,6 +0,0 @@
-import React from 'react'
-import HelloWorld from '../components'
-
-export default { title: 'Hello World' }
-
-export const simpleComponent = () => <HelloWorld />
diff --git a/examples/with-storybook-typescript/stories/welcome.stories.tsx b/examples/with-storybook-typescript/stories/welcome.stories.tsx
deleted file mode 100644
index 2466b9882ddfc..0000000000000
--- a/examples/with-storybook-typescript/stories/welcome.stories.tsx
+++ /dev/null
@@ -1,7 +0,0 @@
-import React from 'react'
-import { linkTo } from '@storybook/addon-links'
-import { Welcome } from '@storybook/react/demo'
-
-export default { title: 'Welcome' }
-
-export const toStorybook = () => <Welcome showApp={linkTo('Button')} />
diff --git a/examples/with-storybook/.storybook/addons.js b/examples/with-storybook/.storybook/addons.js
deleted file mode 100644
index 402ccc13eba33..0000000000000
--- a/examples/with-storybook/.storybook/addons.js
+++ /dev/null
@@ -1,2 +0,0 @@
-import '@storybook/addon-actions/register'
-import '@storybook/addon-links/register'
diff --git a/examples/with-storybook/.storybook/config.js b/examples/with-storybook/.storybook/config.js
deleted file mode 100644
index 28c65f4e7fca5..0000000000000
--- a/examples/with-storybook/.storybook/config.js
+++ /dev/null
@@ -1,25 +0,0 @@
-import { configure, addParameters } from '@storybook/react'
-
-addParameters({
-  options: {
-    storySort: (a, b) => {
-      // We want the Welcome story at the top
-      if (a[1].kind === 'Welcome') {
-        return -1
-      }
-
-      // Sort the other stories by ID
-      // https://github.com/storybookjs/storybook/issues/548#issuecomment-530305279
-      return a[1].kind === b[1].kind
-        ? 0
-        : a[1].id.localeCompare(b[1].id, { numeric: true })
-    },
-  },
-})
-
-// automatically import all files ending in *.stories.js
-const req = require.context('../stories', true, /.stories.js$/)
-
-// the first argument can be an array too, so if you want to load from different locations or
-// different extensions, you can do it like this: configure([req1, req2], module)
-configure(req, module)
diff --git a/examples/with-storybook/.storybook/main.js b/examples/with-storybook/.storybook/main.js
new file mode 100644
index 0000000000000..bb74a535b057d
--- /dev/null
+++ b/examples/with-storybook/.storybook/main.js
@@ -0,0 +1,4 @@
+module.exports = {
+  stories: ['../stories/*.stories.@(ts|tsx|js|jsx|mdx)'],
+  addons: ['@storybook/addon-actions', '@storybook/addon-links'],
+}
diff --git a/examples/with-storybook/.storybook/preview.js b/examples/with-storybook/.storybook/preview.js
new file mode 100644
index 0000000000000..2108b79403292
--- /dev/null
+++ b/examples/with-storybook/.storybook/preview.js
@@ -0,0 +1,16 @@
+export const parameters = {
+  options: {
+    storySort: (a, b) => {
+      // We want the Welcome story at the top
+      if (b[1].kind === 'Welcome') {
+        return 1
+      }
+
+      // Sort the other stories by ID
+      // https://github.com/storybookjs/storybook/issues/548#issuecomment-530305279
+      return a[1].kind === b[1].kind
+        ? 0
+        : a[1].id.localeCompare(b[1].id, { numeric: true })
+    },
+  },
+}
diff --git a/examples/with-storybook/README.md b/examples/with-storybook/README.md
index 6a3239cb0a15f..451ff3d205e27 100644
--- a/examples/with-storybook/README.md
+++ b/examples/with-storybook/README.md
@@ -2,6 +2,10 @@
 
 This example shows a default set up of Storybook. Also included in the example is a custom component included in both Storybook and the Next.js application.
 
+### TypeScript
+
+As of v6.0, Storybook has built-in TypeScript support, so no configuration is needed. If you want to customize the default configuration, refer to the [TypeScript docs](https://storybook.js.org/docs/react/configure/typescript).
+
 ## How to use
 
 ### Using `create-next-app`
diff --git a/examples/with-storybook/package.json b/examples/with-storybook/package.json
index f44b2f5e06445..276059e139922 100644
--- a/examples/with-storybook/package.json
+++ b/examples/with-storybook/package.json
@@ -16,10 +16,10 @@
   },
   "license": "ISC",
   "devDependencies": {
-    "@storybook/addon-actions": "5.2.3",
-    "@storybook/addon-links": "5.2.3",
-    "@storybook/addons": "5.2.3",
-    "@storybook/react": "5.2.3",
+    "@storybook/addon-actions": "6.0.5",
+    "@storybook/addon-links": "6.0.5",
+    "@storybook/addons": "6.0.5",
+    "@storybook/react": "6.0.5",
     "babel-loader": "^8.0.5"
   }
 }
diff --git a/examples/with-supabase-auth-realtime-db/.env.local.example b/examples/with-supabase-auth-realtime-db/.env.local.example
new file mode 100644
index 0000000000000..b6fedec92e308
--- /dev/null
+++ b/examples/with-supabase-auth-realtime-db/.env.local.example
@@ -0,0 +1,2 @@
+NEXT_PUBLIC_SUPABASE_URL=https://your-project.supabase.co
+NEXT_PUBLIC_SUPABASE_KEY=your-anon-key
\ No newline at end of file
diff --git a/examples/with-supabase-auth-realtime-db/.gitignore b/examples/with-supabase-auth-realtime-db/.gitignore
new file mode 100644
index 0000000000000..1437c53f70bc2
--- /dev/null
+++ b/examples/with-supabase-auth-realtime-db/.gitignore
@@ -0,0 +1,34 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# vercel
+.vercel
diff --git a/examples/with-supabase-auth-realtime-db/README.md b/examples/with-supabase-auth-realtime-db/README.md
new file mode 100644
index 0000000000000..7e944e3f6fa61
--- /dev/null
+++ b/examples/with-supabase-auth-realtime-db/README.md
@@ -0,0 +1,139 @@
+# Realtime chat example using Supabase
+
+This is a full-stack Slack clone example using:
+
+- Frontend:
+  - Next.js.
+  - [Supabase](https://supabase.io/docs/library/getting-started) for user management and realtime data syncing.
+- Backend:
+  - [app.supabase.io](https://app.supabase.io/): hosted Postgres database with restful API for usage with Supabase.js.
+
+![Demo animation gif](./docs/slack-clone-demo.gif)
+
+This example is a clone of the [Slack Clone example](https://github.com/supabase/supabase/tree/master/examples/slack-clone) in the supabase repo, feel free to check it out!
+
+## Deploy your own
+
+Once you have access to [the environment variables you'll need](#step-3-set-up-environment-variables), deploy the example using [Vercel](https://vercel.com?utm_source=github&utm_medium=readme&utm_campaign=next-example):
+
+[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/import/git?c=1&s=https://github.com/vercel/next.js/tree/canary/examples/with-supabase-auth-realtime-db&env=NEXT_PUBLIC_SUPABASE_URL,NEXT_PUBLIC_SUPABASE_KEY&envDescription=Required%20to%20connect%20the%20app%to%Supabase&envLink=https://github.com/vercel/next.js/tree/canary/examples/with-supabase-auth-realtime-db%23step-3-set-up-environment-variables&project-name=supabase-slack-clone&repo-name=supabase-slack-clone)
+
+## How to use
+
+Execute [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app) with [npm](https://docs.npmjs.com/cli/init) or [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/) to bootstrap the example:
+
+```bash
+npx create-next-app --example with-supabase-auth-realtime-db realtime-chat-app
+# or
+yarn create next-app --example with-supabase-auth-realtime-db realtime-chat-app
+```
+
+## Configuration
+
+### Step 1. Create a new Supabase project
+
+Sign up to Supabase - [https://app.supabase.io](https://app.supabase.io) and create a new project. Wait for your database to start.
+
+### Step 2. Run the "Slack Clone" Quickstart
+
+Once your database has started, run the "Slack Clone" quickstart.
+
+![Slack Clone Quick Start](https://user-images.githubusercontent.com/10214025/88916135-1b1d7a00-d298-11ea-82e7-e2c18314e805.png)
+
+### Step 3. Set up environment variables
+
+In your Supabase project, go to Project Settings (the cog icon), open the API tab, and find your **API URL** and **anon** key, you'll need these in the next step.
+
+![image](https://user-images.githubusercontent.com/10214025/88916245-528c2680-d298-11ea-8a71-708f93e1ce4f.png)
+
+Next, copy the `.env.local.example` file in this directory to `.env.local` (which will be ignored by Git):
+
+```bash
+cp .env.local.example .env.local
+```
+
+Then set each variable on `.env.local`:
+
+- `NEXT_PUBLIC_SUPABASE_URL` should be the **API URL**
+- `NEXT_PUBLIC_SUPABASE_KEY` should be the **anon** key
+
+The **anon** key is your client-side API key. It allows "anonymous access" to your database, until the user has logged in. Once they have logged in, the keys will switch to the user's own login token. This enables row level security for your data. Read more about this [below](#postgres-row-level-security).
+
+> **_NOTE_**: The `service_role` key has full access to your data, bypassing any security policies. These keys have to be kept secret and are meant to be used in server environments and never on a client or browser.
+
+### Step 4. Run Next.js in development mode
+
+```bash
+npm install
+npm run dev
+
+# or
+
+yarn install
+yarn dev
+```
+
+Visit [http://localhost:3000](http://localhost:3000) and start chatting! Open a channel across two browser tabs to see everything getting updated in realtime 🥳. If it doesn't work, post on [GitHub discussions](https://github.com/vercel/next.js/discussions).
+
+### Step 5. Deploy on Vercel
+
+You can deploy this app to the cloud with [Vercel](https://vercel.com?utm_source=github&utm_medium=readme&utm_campaign=next-example) ([Documentation](https://nextjs.org/docs/deployment)).
+
+#### Deploy Your Local Project
+
+To deploy your local project to Vercel, push it to GitHub/GitLab/Bitbucket and [import to Vercel](https://vercel.com/import/git?utm_source=github&utm_medium=readme&utm_campaign=next-example).
+
+**Important**: When you import your project on Vercel, make sure to click on **Environment Variables** and set them to match your `.env.local` file.
+
+#### Deploy from Our Template
+
+Alternatively, you can deploy using our template by clicking on the Deploy button below.
+
+[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/import/git?c=1&s=https://github.com/vercel/next.js/tree/canary/examples/with-supabase-auth-realtime-db&env=NEXT_PUBLIC_SUPABASE_URL,NEXT_PUBLIC_SUPABASE_KEY&envDescription=Required%20to%20connect%20the%20app%to%Supabase&envLink=https://github.com/vercel/next.js/tree/canary/examples/with-supabase-auth-realtime-db%23step-3-set-up-environment-variables&project-name=supabase-slack-clone&repo-name=supabase-slack-clone)
+
+## Supabase details
+
+### Postgres Row level security
+
+This project uses very high-level Authorization using Postgres' Role Level Security.
+When you start a Postgres database on Supabase, we populate it with an `auth` schema, and some helper functions.
+When a user logs in, they are issued a JWT with the role `authenticated` and thier UUID.
+We can use these details to provide fine-grained control over what each user can and cannot do.
+
+This is a trimmed-down schema, with the policies:
+
+```sql
+-- USER PROFILES
+CREATE TYPE public.user_status AS ENUM ('ONLINE', 'OFFLINE');
+CREATE TABLE public.users (
+  id uuid NOT NULL PRIMARY KEY, -- UUID from auth.users (Supabase)
+  username text,
+  status user_status DEFAULT 'OFFLINE'::public.user_status
+);
+ALTER TABLE public.users ENABLE ROW LEVEL SECURITY;
+CREATE POLICY "Allow logged-in read access" on public.users FOR SELECT USING ( auth.role() = 'authenticated' );
+CREATE POLICY "Allow individual insert access" on public.users FOR INSERT WITH CHECK ( auth.uid() = id );
+CREATE POLICY "Allow individual update access" on public.users FOR UPDATE USING ( auth.uid() = id );
+
+-- CHANNELS
+CREATE TABLE public.channels (
+  id bigint GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+  inserted_at timestamp with time zone DEFAULT timezone('utc'::text, now()) NOT NULL,
+  slug text NOT NULL UNIQUE
+);
+ALTER TABLE public.channels ENABLE ROW LEVEL SECURITY;
+CREATE POLICY "Allow logged-in full access" on public.channels FOR ALL USING ( auth.role() = 'authenticated' );
+
+-- MESSAGES
+CREATE TABLE public.messages (
+  id bigint GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+  inserted_at timestamp with time zone DEFAULT timezone('utc'::text, now()) NOT NULL,
+  message text,
+  user_id uuid REFERENCES public.users NOT NULL,
+  channel_id bigint REFERENCES public.channels NOT NULL
+);
+ALTER TABLE public.messages ENABLE ROW LEVEL SECURITY;
+CREATE POLICY "Allow logged-in read access" on public.messages USING ( auth.role() = 'authenticated' );
+CREATE POLICY "Allow individual insert access" on public.messages FOR INSERT WITH CHECK ( auth.uid() = user_id );
+CREATE POLICY "Allow individual update access" on public.messages FOR UPDATE USING ( auth.uid() = user_id );
+```
diff --git a/examples/with-supabase-auth-realtime-db/components/Layout.js b/examples/with-supabase-auth-realtime-db/components/Layout.js
new file mode 100644
index 0000000000000..1b94dea575aa5
--- /dev/null
+++ b/examples/with-supabase-auth-realtime-db/components/Layout.js
@@ -0,0 +1,80 @@
+import Link from 'next/link'
+import { useContext } from 'react'
+import UserContext from '~/lib/UserContext'
+import { addChannel } from '~/lib/Store'
+
+export default function Layout(props) {
+  const { signOut } = useContext(UserContext)
+
+  const slugify = (text) => {
+    return text
+      .toString()
+      .toLowerCase()
+      .replace(/\s+/g, '-') // Replace spaces with -
+      .replace(/[^\w-]+/g, '') // Remove all non-word chars
+      .replace(/--+/g, '-') // Replace multiple - with single -
+      .replace(/^-+/, '') // Trim - from start of text
+      .replace(/-+$/, '') // Trim - from end of text
+  }
+
+  const newChannel = async () => {
+    const slug = prompt('Please enter your name')
+    if (slug) {
+      addChannel(slugify(slug))
+    }
+  }
+
+  return (
+    <main className="main flex h-screen w-screen absolute overflow-hidden">
+      {/* Sidebar */}
+      <nav
+        className="w-64 bg-gray-900 text-gray-100 h-screen"
+        style={{ maxWidth: '20%', minWidth: 150 }}
+      >
+        <div className="p-2">
+          <h4 className="font-bold">Channels</h4>
+          <ul className="channel-list">
+            {props.channels.map((x) => (
+              <SidebarItem
+                channel={x}
+                key={x.id}
+                isActiveChannel={x.id === props.activeChannelId}
+              />
+            ))}
+          </ul>
+        </div>
+        <hr className="m-2" />
+        <div className="p-2">
+          <button
+            className="bg-blue-900 hover:bg-blue-800 text-white py-2 px-4 rounded w-full transition duration-150"
+            onClick={() => newChannel()}
+          >
+            New Channel
+          </button>
+        </div>
+        <hr className="m-2" />
+        <div className="p-2">
+          <button
+            className="bg-blue-900 hover:bg-blue-800 text-white py-2 px-4 rounded w-full transition duration-150"
+            onClick={() => signOut()}
+          >
+            Log out
+          </button>
+        </div>
+      </nav>
+
+      {/* Messages */}
+      <div className="flex-1 bg-gray-800 h-screen">{props.children}</div>
+    </main>
+  )
+}
+
+const SidebarItem = ({ channel, isActiveChannel }) => (
+  <>
+    <li>
+      <Link href="/channels/[id]" as={`/channels/${channel.id}`}>
+        <a className={isActiveChannel ? 'font-bold' : ''}>{channel.slug}</a>
+      </Link>
+    </li>
+  </>
+)
diff --git a/examples/with-supabase-auth-realtime-db/components/Message.js b/examples/with-supabase-auth-realtime-db/components/Message.js
new file mode 100644
index 0000000000000..1590a0ab9c095
--- /dev/null
+++ b/examples/with-supabase-auth-realtime-db/components/Message.js
@@ -0,0 +1,10 @@
+const Message = ({ message }) => (
+  <>
+    <div className="py-1">
+      <p className="text-blue-700 font-bold">{message.author.username}</p>
+      <p className="text-white">{message.message}</p>
+    </div>
+  </>
+)
+
+export default Message
diff --git a/examples/with-supabase-auth-realtime-db/components/MessageInput.js b/examples/with-supabase-auth-realtime-db/components/MessageInput.js
new file mode 100644
index 0000000000000..1c0e3501beb57
--- /dev/null
+++ b/examples/with-supabase-auth-realtime-db/components/MessageInput.js
@@ -0,0 +1,28 @@
+import { useState } from 'react'
+
+const MessageInput = ({ onSubmit }) => {
+  const [messageText, setMessageText] = useState('')
+
+  const submitOnEnter = (event) => {
+    // Watch for enter key
+    if (event.keyCode === 13) {
+      onSubmit(messageText)
+      setMessageText('')
+    }
+  }
+
+  return (
+    <>
+      <input
+        className="shadow appearance-none border rounded w-full py-2 px-3 text-gray-700 leading-tight focus:outline-none focus:shadow-outline"
+        type="text"
+        placeholder="Send a message"
+        value={messageText}
+        onChange={(e) => setMessageText(e.target.value)}
+        onKeyDown={(e) => submitOnEnter(e)}
+      />
+    </>
+  )
+}
+
+export default MessageInput
diff --git a/examples/with-supabase-auth-realtime-db/docs/slack-clone-demo.gif b/examples/with-supabase-auth-realtime-db/docs/slack-clone-demo.gif
new file mode 100644
index 0000000000000..8dff9b017beae
Binary files /dev/null and b/examples/with-supabase-auth-realtime-db/docs/slack-clone-demo.gif differ
diff --git a/examples/with-supabase-auth-realtime-db/jsconfig.json b/examples/with-supabase-auth-realtime-db/jsconfig.json
new file mode 100644
index 0000000000000..7af8f6e0edda1
--- /dev/null
+++ b/examples/with-supabase-auth-realtime-db/jsconfig.json
@@ -0,0 +1,8 @@
+{
+  "compilerOptions": {
+    "baseUrl": ".",
+    "paths": {
+      "~/*": ["./*"]
+    }
+  }
+}
diff --git a/examples/with-supabase-auth-realtime-db/lib/Store.js b/examples/with-supabase-auth-realtime-db/lib/Store.js
new file mode 100644
index 0000000000000..b22779c735a08
--- /dev/null
+++ b/examples/with-supabase-auth-realtime-db/lib/Store.js
@@ -0,0 +1,169 @@
+import { useState, useEffect } from 'react'
+import { createClient } from '@supabase/supabase-js'
+
+const supabase = createClient(
+  process.env.NEXT_PUBLIC_SUPABASE_URL,
+  process.env.NEXT_PUBLIC_SUPABASE_KEY
+)
+
+/**
+ * @param {number} channelId the currently selected Channel
+ */
+export const useStore = (props) => {
+  const [channels, setChannels] = useState([])
+  const [messages, setMessages] = useState([])
+  const [users] = useState(new Map())
+  const [newMessage, handleNewMessage] = useState(null)
+  const [newChannel, handleNewChannel] = useState(null)
+  const [newOrUpdatedUser, handleNewOrUpdatedUser] = useState(null)
+
+  // Load initial data and set up listeners
+  useEffect(() => {
+    // Get Channels
+    fetchChannels(setChannels)
+    // Listen for new messages
+    const messageListener = supabase
+      .from('messages')
+      .on('INSERT', (payload) => handleNewMessage(payload.new))
+      .subscribe()
+    // Listen for changes to our users
+    const userListener = supabase
+      .from('users')
+      .on('*', (payload) => handleNewOrUpdatedUser(payload.new))
+      .subscribe()
+    // Listen for new channels
+    const channelListener = supabase
+      .from('channels')
+      .on('INSERT', (payload) => handleNewChannel(payload.new))
+      .subscribe()
+    // Cleanup on unmount
+    return () => {
+      messageListener.unsubscribe()
+      userListener.unsubscribe()
+      channelListener.unsubscribe()
+    }
+  }, [])
+
+  // Update when the route changes
+  useEffect(() => {
+    if (props?.channelId > 0) {
+      fetchMessages(props.channelId, (messages) => {
+        messages.forEach((x) => users.set(x.user_id, x.author))
+        setMessages(messages)
+      })
+    }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [props.channelId])
+
+  // New message recieved from Postgres
+  useEffect(() => {
+    if (newMessage && newMessage.channel_id === Number(props.channelId)) {
+      const handleAsync = async () => {
+        let authorId = newMessage.user_id
+        if (!users.get(authorId))
+          await fetchUser(authorId, (user) => handleNewOrUpdatedUser(user))
+        setMessages(messages.concat(newMessage))
+      }
+      handleAsync()
+    }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [newMessage])
+
+  // New channel recieved from Postgres
+  useEffect(() => {
+    if (newChannel) setChannels(channels.concat(newChannel))
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [newChannel])
+
+  // New or updated user recieved from Postgres
+  useEffect(() => {
+    if (newOrUpdatedUser) users.set(newOrUpdatedUser.id, newOrUpdatedUser)
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [newOrUpdatedUser])
+
+  return {
+    // We can export computed values here to map the authors to each message
+    messages: messages.map((x) => ({ ...x, author: users.get(x.user_id) })),
+    channels: channels.sort((a, b) => a.slug.localeCompare(b.slug)),
+    users,
+  }
+}
+
+/**
+ * Fetch all channels
+ * @param {function} setState Optionally pass in a hook or callback to set the state
+ */
+export const fetchChannels = async (setState) => {
+  try {
+    let { body } = await supabase.from('channels').select('*')
+    if (setState) setState(body)
+    return body
+  } catch (error) {
+    console.log('error', error)
+  }
+}
+
+/**
+ * Fetch a single user
+ * @param {number} userId
+ * @param {function} setState Optionally pass in a hook or callback to set the state
+ */
+export const fetchUser = async (userId, setState) => {
+  try {
+    let { body } = await supabase.from('users').eq('id', userId).select(`*`)
+    let user = body[0]
+    if (setState) setState(user)
+    return user
+  } catch (error) {
+    console.log('error', error)
+  }
+}
+
+/**
+ * Fetch all messages and their authors
+ * @param {number} channelId
+ * @param {function} setState Optionally pass in a hook or callback to set the state
+ */
+export const fetchMessages = async (channelId, setState) => {
+  try {
+    let { body } = await supabase
+      .from('messages')
+      .eq('channel_id', channelId)
+      .select(`*, author:user_id(*)`)
+      .order('inserted_at', true)
+    if (setState) setState(body)
+    return body
+  } catch (error) {
+    console.log('error', error)
+  }
+}
+
+/**
+ * Insert a new channel into the DB
+ * @param {string} slug The channel name
+ */
+export const addChannel = async (slug) => {
+  try {
+    let { body } = await supabase.from('channels').insert([{ slug }])
+    return body
+  } catch (error) {
+    console.log('error', error)
+  }
+}
+
+/**
+ * Insert a new message into the DB
+ * @param {string} message The message text
+ * @param {number} channel_id
+ * @param {number} user_id The author
+ */
+export const addMessage = async (message, channel_id, user_id) => {
+  try {
+    let { body } = await supabase
+      .from('messages')
+      .insert([{ message, channel_id, user_id }])
+    return body
+  } catch (error) {
+    console.log('error', error)
+  }
+}
diff --git a/examples/with-supabase-auth-realtime-db/lib/UserContext.js b/examples/with-supabase-auth-realtime-db/lib/UserContext.js
new file mode 100644
index 0000000000000..ee09678f5089b
--- /dev/null
+++ b/examples/with-supabase-auth-realtime-db/lib/UserContext.js
@@ -0,0 +1,5 @@
+import { createContext } from 'react'
+
+const UserContext = createContext()
+
+export default UserContext
diff --git a/examples/with-supabase-auth-realtime-db/package.json b/examples/with-supabase-auth-realtime-db/package.json
new file mode 100644
index 0000000000000..5b33e3198609d
--- /dev/null
+++ b/examples/with-supabase-auth-realtime-db/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "realtime-chat-app",
+  "version": "0.1.0",
+  "license": "MIT",
+  "scripts": {
+    "dev": "next",
+    "build": "next build",
+    "start": "next start"
+  },
+  "dependencies": {
+    "@supabase/supabase-js": "^0.35.9",
+    "next": "latest",
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1",
+    "sass": "^1.26.2",
+    "tailwindcss": "^1.1.4"
+  }
+}
diff --git a/examples/with-supabase-auth-realtime-db/pages/_app.js b/examples/with-supabase-auth-realtime-db/pages/_app.js
new file mode 100644
index 0000000000000..8bd38f78bcc7a
--- /dev/null
+++ b/examples/with-supabase-auth-realtime-db/pages/_app.js
@@ -0,0 +1,71 @@
+import '~/styles/style.scss'
+import React from 'react'
+import App from 'next/app'
+import Router from 'next/router'
+import UserContext from 'lib/UserContext'
+import { createClient } from '@supabase/supabase-js'
+
+const supabase = createClient(
+  process.env.NEXT_PUBLIC_SUPABASE_URL,
+  process.env.NEXT_PUBLIC_SUPABASE_KEY
+)
+
+export default class SupabaseSlackClone extends App {
+  state = {
+    authLoaded: false,
+    user: null,
+  }
+
+  componentDidMount = () => {
+    const user = localStorage.getItem('supabase-slack-clone')
+    if (user) this.setState({ user, authLoaded: true })
+    else Router.push('/')
+  }
+
+  signIn = async (id, username) => {
+    try {
+      let { body } = await supabase
+        .from('users')
+        .match({ username })
+        .select('id, username')
+      const existing = body[0]
+      const { body: user } = existing?.id
+        ? await supabase
+            .from('users')
+            .update({ id, username })
+            .match({ id })
+            .single()
+        : await supabase.from('users').insert([{ id, username }]).single()
+
+      localStorage.setItem('supabase-slack-clone', user.id)
+      this.setState({ user: user.id }, () => {
+        Router.push('/channels/[id]', '/channels/1')
+      })
+    } catch (error) {
+      console.log('error', error)
+    }
+  }
+
+  signOut = () => {
+    supabase.auth.logout()
+    localStorage.removeItem('supabase-slack-clone')
+    this.setState({ user: null })
+    Router.push('/')
+  }
+
+  render() {
+    const { Component, pageProps } = this.props
+    return (
+      <UserContext.Provider
+        value={{
+          authLoaded: this.state.authLoaded,
+          user: this.state.user,
+          signIn: this.signIn,
+          signOut: this.signOut,
+        }}
+      >
+        <Component {...pageProps} />
+      </UserContext.Provider>
+    )
+  }
+}
diff --git a/examples/with-supabase-auth-realtime-db/pages/channels/[id].js b/examples/with-supabase-auth-realtime-db/pages/channels/[id].js
new file mode 100644
index 0000000000000..7e9bd5f808ebd
--- /dev/null
+++ b/examples/with-supabase-auth-realtime-db/pages/channels/[id].js
@@ -0,0 +1,53 @@
+import Layout from '~/components/Layout'
+import Message from '~/components/Message'
+import MessageInput from '~/components/MessageInput'
+import { useRouter } from 'next/router'
+import { useStore, addMessage } from '~/lib/Store'
+import { useContext, useEffect, useRef } from 'react'
+import UserContext from '~/lib/UserContext'
+
+const ChannelsPage = (props) => {
+  const router = useRouter()
+  const { user, authLoaded, signOut } = useContext(UserContext)
+  const messagesEndRef = useRef(null)
+
+  // Redirect if not signed in.
+  useEffect(() => {
+    if (authLoaded && !user) signOut()
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [user, router])
+
+  // Else load up the page
+  const { id: channelId } = router.query
+  const { messages, channels } = useStore({ channelId })
+
+  useEffect(() => {
+    messagesEndRef.current.scrollIntoView({
+      block: 'start',
+      behavior: 'smooth',
+    })
+  }, [messages])
+
+  // Render the channels and messages
+  return (
+    <Layout channels={channels} activeChannelId={channelId}>
+      <div className="relative h-screen">
+        <div className="Messages h-full pb-16">
+          <div className="p-2 overflow-y-auto">
+            {messages.map((x) => (
+              <Message key={x.id} message={x} />
+            ))}
+            <div ref={messagesEndRef} style={{ height: 0 }} />
+          </div>
+        </div>
+        <div className="p-2 absolute bottom-0 left-0 w-full">
+          <MessageInput
+            onSubmit={async (text) => addMessage(text, channelId, user)}
+          />
+        </div>
+      </div>
+    </Layout>
+  )
+}
+
+export default ChannelsPage
diff --git a/examples/with-supabase-auth-realtime-db/pages/index.js b/examples/with-supabase-auth-realtime-db/pages/index.js
new file mode 100644
index 0000000000000..7585c0be47dd7
--- /dev/null
+++ b/examples/with-supabase-auth-realtime-db/pages/index.js
@@ -0,0 +1,87 @@
+import { useState, useContext } from 'react'
+import UserContext from 'lib/UserContext'
+import { createClient } from '@supabase/supabase-js'
+
+const supabase = createClient(
+  process.env.NEXT_PUBLIC_SUPABASE_URL,
+  process.env.NEXT_PUBLIC_SUPABASE_KEY
+)
+
+const Home = () => {
+  const { signIn } = useContext(UserContext)
+  const [username, setUsername] = useState('')
+  const [password, setPassword] = useState('')
+
+  const handleLogin = async (type, username, password) => {
+    try {
+      const {
+        body: { user },
+      } =
+        type === 'LOGIN'
+          ? await supabase.auth.login(username, password)
+          : await supabase.auth.signup(username, password)
+      if (!!user) signIn(user.id, user.email)
+    } catch (error) {
+      console.log('error', error)
+      alert(error.error_description || error)
+    }
+  }
+
+  return (
+    <div className="w-full h-full flex justify-center items-center p-4 bg-gray-300">
+      <div className="w-full sm:w-1/2 xl:w-1/3">
+        <div className="border-teal p-8 border-t-12 bg-white mb-6 rounded-lg shadow-lg bg-white">
+          <div className="mb-4">
+            <label className="font-bold text-grey-darker block mb-2">
+              Email
+            </label>
+            <input
+              type="text"
+              className="block appearance-none w-full bg-white border border-grey-light hover:border-grey px-2 py-2 rounded shadow"
+              placeholder="Your Username"
+              value={username}
+              onChange={(e) => setUsername(e.target.value)}
+            />
+          </div>
+          <div className="mb-4">
+            <label className="font-bold text-grey-darker block mb-2">
+              Password
+            </label>
+            <input
+              type="password"
+              className="block appearance-none w-full bg-white border border-grey-light hover:border-grey px-2 py-2 rounded shadow"
+              placeholder="Your password"
+              value={password}
+              onChange={(e) => setPassword(e.target.value)}
+            />
+          </div>
+
+          <div className="flex flex-col gap-2">
+            <a
+              onClick={(e) => {
+                e.preventDefault()
+                handleLogin('SIGNUP', username, password)
+              }}
+              href={'/channels'}
+              className="bg-indigo-700 hover:bg-teal text-white py-2 px-4 rounded text-center transition duration-150 hover:bg-indigo-600 hover:text-white"
+            >
+              Sign up
+            </a>
+            <a
+              onClick={(e) => {
+                e.preventDefault()
+                handleLogin('LOGIN', username, password)
+              }}
+              href={'/channels'}
+              className="border border-indigo-700 text-indigo-700 py-2 px-4 rounded w-full text-center transition duration-150 hover:bg-indigo-700 hover:text-white"
+            >
+              Login
+            </a>
+          </div>
+        </div>
+      </div>
+    </div>
+  )
+}
+
+export default Home
diff --git a/examples/with-supabase-auth-realtime-db/styles/style.scss b/examples/with-supabase-auth-realtime-db/styles/style.scss
new file mode 100644
index 0000000000000..e6f0385abc078
--- /dev/null
+++ b/examples/with-supabase-auth-realtime-db/styles/style.scss
@@ -0,0 +1,28 @@
+@import '~tailwindcss/dist/base.css';
+@import '~tailwindcss/dist/components.css';
+@import '~tailwindcss/dist/utilities.css';
+
+html,
+body,
+#__next,
+.main {
+  max-height: 100vh;
+  height: 100vh;
+  margin: 0;
+  padding: 0;
+  overflow: hidden;
+}
+.channel-list {
+  li a:before {
+    content: '# ';
+    opacity: 0.5;
+  }
+  li a:hover {
+    opacity: 0.9;
+  }
+}
+.Messages {
+  overflow: auto;
+  display: flex;
+  flex-direction: column-reverse;
+}
diff --git a/examples/with-typescript/package.json b/examples/with-typescript/package.json
index fc269dba461ba..e871704c247cf 100644
--- a/examples/with-typescript/package.json
+++ b/examples/with-typescript/package.json
@@ -16,7 +16,7 @@
     "@types/node": "^12.12.21",
     "@types/react": "^16.9.16",
     "@types/react-dom": "^16.9.4",
-    "typescript": "3.7.3"
+    "typescript": "3.9.7"
   },
   "license": "ISC"
 }
diff --git a/lerna.json b/lerna.json
index caa39c09d031b..4f5c7ea0951a7 100644
--- a/lerna.json
+++ b/lerna.json
@@ -17,5 +17,5 @@
       "registry": "https://registry.npmjs.org/"
     }
   },
-  "version": "9.5.2"
+  "version": "9.5.3-canary.13"
 }
diff --git a/packages/create-next-app/create-app.ts b/packages/create-next-app/create-app.ts
index a180c9f631ec5..2db10c89c0756 100644
--- a/packages/create-next-app/create-app.ts
+++ b/packages/create-next-app/create-app.ts
@@ -19,6 +19,7 @@ import { install } from './helpers/install'
 import { isFolderEmpty } from './helpers/is-folder-empty'
 import { getOnline } from './helpers/is-online'
 import { shouldUseYarn } from './helpers/should-use-yarn'
+import { isWriteable } from './helpers/is-writeable'
 
 export class DownloadError extends Error {}
 
@@ -93,6 +94,17 @@ export async function createApp({
   }
 
   const root = path.resolve(appPath)
+
+  if (!(await isWriteable(path.dirname(root)))) {
+    console.error(
+      'The application path is not writable, please check folder permissions and try again.'
+    )
+    console.error(
+      'It is likely you do not have write permissions for this folder.'
+    )
+    process.exit(1)
+  }
+
   const appName = path.basename(root)
 
   await makeDir(root)
diff --git a/packages/create-next-app/helpers/is-writeable.ts b/packages/create-next-app/helpers/is-writeable.ts
new file mode 100644
index 0000000000000..0b9e9abb4f0fe
--- /dev/null
+++ b/packages/create-next-app/helpers/is-writeable.ts
@@ -0,0 +1,10 @@
+import fs from 'fs'
+
+export async function isWriteable(directory: string): Promise<boolean> {
+  try {
+    await fs.promises.access(directory, (fs.constants || fs).W_OK)
+    return true
+  } catch (err) {
+    return false
+  }
+}
diff --git a/packages/create-next-app/package.json b/packages/create-next-app/package.json
index ab96be9e3bbea..eaba0d3c4d013 100644
--- a/packages/create-next-app/package.json
+++ b/packages/create-next-app/package.json
@@ -1,6 +1,6 @@
 {
   "name": "create-next-app",
-  "version": "9.5.2",
+  "version": "9.5.3-canary.13",
   "keywords": [
     "react",
     "next",
diff --git a/packages/eslint-plugin-next/package.json b/packages/eslint-plugin-next/package.json
index 69c4731b12479..de2304e6568e0 100644
--- a/packages/eslint-plugin-next/package.json
+++ b/packages/eslint-plugin-next/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/eslint-plugin-next",
-  "version": "9.5.2",
+  "version": "9.5.3-canary.13",
   "description": "ESLint plugin for NextJS.",
   "main": "lib/index.js",
   "license": "MIT",
diff --git a/packages/next-bundle-analyzer/package.json b/packages/next-bundle-analyzer/package.json
index cfd66a8ae0011..570c1066fa8a2 100644
--- a/packages/next-bundle-analyzer/package.json
+++ b/packages/next-bundle-analyzer/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/bundle-analyzer",
-  "version": "9.5.2",
+  "version": "9.5.3-canary.13",
   "main": "index.js",
   "license": "MIT",
   "repository": {
diff --git a/packages/next-bundle-analyzer/readme.md b/packages/next-bundle-analyzer/readme.md
index 5ddf2b8f08275..1436cb23c8030 100644
--- a/packages/next-bundle-analyzer/readme.md
+++ b/packages/next-bundle-analyzer/readme.md
@@ -41,3 +41,18 @@ ANALYZE=true yarn build
 ```
 
 When enabled two HTML files (client.html and server.html) will be outputted to `<distDir>/analyze/`. One will be for the server bundle, one for the browser bundle.
+
+### Usage with next-compose-plugins
+
+From version 2.0.0 of next-compose-plugins you need to call bundle-analyzer in this way to work
+
+```js
+const withPlugins = require('next-compose-plugins')
+const withBundleAnalyzer = require('@next/bundle-analyzer')({
+  enabled: process.env.ANALYZE === 'true',
+})
+module.exports = withPlugins([
+  [withBundleAnalyzer({})],
+  // your other plugins here
+])
+```
diff --git a/packages/next-codemod/README.md b/packages/next-codemod/README.md
index 7aa721c899503..ce458da7e90c7 100644
--- a/packages/next-codemod/README.md
+++ b/packages/next-codemod/README.md
@@ -1,171 +1,9 @@
-# Next.js Codemod
+# Next.js Codemods
 
-This repository contains Codemod transformations to help upgrade Next.js codebases.
+Next.js provides Codemod transformations to help upgrade your Next.js codebase when a feature is deprecated.
 
-## v9
+Codemods are transformations that run on your codebase programmatically. This allows for a large amount of changes to be applied without having to manually go through every file.
 
-### `name-default-component`
+## Documentation
 
-Transforms anonymous components into named components to make sure they work with [Fast Refresh](https://nextjs.org/blog/next-9-4#fast-refresh).
-
-For example
-
-```jsx
-// my-component.js
-export default function () {
-  return <div>Hello World</div>
-}
-```
-
-Transforms into:
-
-```jsx
-// my-component.js
-export default function MyComponent() {
-  return <div>Hello World</div>
-}
-```
-
-The component will have a camel cased name based on the name of the file, and it also works with arrow functions.
-
-#### Usage
-
-Go to your project
-
-```
-cd path-to-your-project/
-```
-
-Download the codemod:
-
-```
-curl -L https://github.com/zeit/next-codemod/archive/master.tar.gz | tar -xz --strip=2 next-codemod-master/transforms/name-default-component.js
-```
-
-Run the transformation:
-
-```
-npx jscodeshift -t ./name-default-component.js components/**/*.js
-```
-
-TypeScript files can use this codemod too:
-
-```
-npx jscodeshift -t ./name-default-component.js --parser=tsx components/**/*.tsx
-```
-
-If you have components in multiple folders, change the path to `**/*.js` and add `--ignore-pattern="**/node_modules/**"`.
-
-After the transformation is done the `name-default-component.js` file in the root of your project can be removed.
-
-### `withamp-to-config`
-
-Transforms the `withAmp` HOC into Next.js 9 page configuration.
-
-For example:
-
-```js
-// Before
-import { withAmp } from 'next/amp'
-
-function Home() {
-  return <h1>My AMP Page</h1>
-}
-
-export default withAmp(Home)
-```
-
-```js
-// After
-export default function Home() {
-  return <h1>My AMP Page</h1>
-}
-
-export const config = {
-  amp: true,
-}
-```
-
-#### Usage
-
-Go to your project
-
-```
-cd path-to-your-project/
-```
-
-Download the codemod:
-
-```
-curl -L https://github.com/zeit/next-codemod/archive/master.tar.gz | tar -xz --strip=2 next-codemod-master/transforms/withamp-to-config.js
-```
-
-Run the transformation:
-
-```
-npx jscodeshift -t ./withamp-to-config.js pages/**/*.js
-```
-
-After the transformation is done the `withamp-to-config.js` file in the root of your project can be removed.
-
-## v6
-
-### `url-to-withrouter`
-
-Tranforms the deprecated automatically injected `url` property on top level pages to using `withRouter` and the `router` property it injects. Read more here: [err.sh/next.js/url-deprecated](https://err.sh/next.js/url-deprecated)
-
-For example:
-
-```js
-// From
-import React from 'react'
-export default class extends React.Component {
-  render() {
-    const { pathname } = this.props.url
-    return <div>Current pathname: {pathname}</div>
-  }
-}
-```
-
-```js
-// To
-import React from 'react'
-import { withRouter } from 'next/router'
-export default withRouter(
-  class extends React.Component {
-    render() {
-      const { pathname } = this.props.router
-      return <div>Current pathname: {pathname}</div>
-    }
-  }
-)
-```
-
-This is just one case. All the cases that are transformed (and tested) can be found in the [`__testfixtures__` directory](./transforms/__testfixtures__/url-to-withrouter).
-
-#### Usage
-
-Go to your project
-
-```
-cd path-to-your-project/
-```
-
-Download the codemod:
-
-```
-curl -L https://github.com/zeit/next-codemod/archive/master.tar.gz | tar -xz --strip=2 next-codemod-master/transforms/url-to-withrouter.js
-```
-
-Run the transformation:
-
-```
-npx jscodeshift -t ./url-to-withrouter.js pages/**/*.js
-```
-
-After the transformation is done the `url-to-withrouter.js` file in the root of your project can be removed.
-
-## Authors
-
-- Tim Neutkens ([@timneutkens](https://twitter.com/timneutkens)) – [ZEIT](https://zeit.co)
-- Joe Haddad ([@timer150](https://twitter.com/timer150)) - [ZEIT](https://zeit.co)
+Visit [nextjs.org/docs/advanced-features/codemods](https://nextjs.org/docs/advanced-features/codemods) to view the documentation for this package.
diff --git a/packages/next-codemod/package.json b/packages/next-codemod/package.json
index dcd2814e87436..31ddef3d8b79c 100644
--- a/packages/next-codemod/package.json
+++ b/packages/next-codemod/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/codemod",
-  "version": "9.5.2",
+  "version": "9.5.3-canary.13",
   "license": "MIT",
   "dependencies": {
     "chalk": "4.1.0",
diff --git a/packages/next-mdx/package.json b/packages/next-mdx/package.json
index 4735e836a26ca..3f9a7ab91939b 100644
--- a/packages/next-mdx/package.json
+++ b/packages/next-mdx/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/mdx",
-  "version": "9.5.2",
+  "version": "9.5.3-canary.13",
   "main": "index.js",
   "license": "MIT",
   "repository": {
diff --git a/packages/next-plugin-google-analytics/package.json b/packages/next-plugin-google-analytics/package.json
index c373f43f91c62..13d6030f4d3c0 100644
--- a/packages/next-plugin-google-analytics/package.json
+++ b/packages/next-plugin-google-analytics/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/plugin-google-analytics",
-  "version": "9.5.2",
+  "version": "9.5.3-canary.13",
   "repository": {
     "url": "vercel/next.js",
     "directory": "packages/next-plugin-google-analytics"
diff --git a/packages/next-plugin-sentry/package.json b/packages/next-plugin-sentry/package.json
index e514ccad950eb..8a6735b3f29e9 100644
--- a/packages/next-plugin-sentry/package.json
+++ b/packages/next-plugin-sentry/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/plugin-sentry",
-  "version": "9.5.2",
+  "version": "9.5.3-canary.13",
   "repository": {
     "url": "vercel/next.js",
     "directory": "packages/next-plugin-sentry"
diff --git a/packages/next-plugin-storybook/package.json b/packages/next-plugin-storybook/package.json
index f92f9bb549335..d1f146e096d18 100644
--- a/packages/next-plugin-storybook/package.json
+++ b/packages/next-plugin-storybook/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/plugin-storybook",
-  "version": "9.5.2",
+  "version": "9.5.3-canary.13",
   "repository": {
     "url": "vercel/next.js",
     "directory": "packages/next-plugin-storybook"
diff --git a/packages/next-polyfill-nomodule/package.json b/packages/next-polyfill-nomodule/package.json
index 2809c592db080..bce2bda4b0d6d 100644
--- a/packages/next-polyfill-nomodule/package.json
+++ b/packages/next-polyfill-nomodule/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/polyfill-nomodule",
-  "version": "9.5.2",
+  "version": "9.5.3-canary.13",
   "description": "A polyfill for non-dead, nomodule browsers.",
   "main": "dist/polyfill-nomodule.js",
   "license": "MIT",
diff --git a/packages/next/bin/next.ts b/packages/next/bin/next.ts
index 6e8ee0429b4bd..5c4cc27f6795c 100755
--- a/packages/next/bin/next.ts
+++ b/packages/next/bin/next.ts
@@ -7,7 +7,6 @@ import { NON_STANDARD_NODE_ENV } from '../lib/constants'
     // When 'npm link' is used it checks the clone location. Not the project.
     require.resolve(dependency)
   } catch (err) {
-    // tslint:disable-next-line
     console.warn(
       `The module '${dependency}' was not found. Next.js requires that you include it in 'dependencies' of your 'package.json'. To add it, run 'npm install ${dependency}'`
     )
@@ -44,7 +43,6 @@ const args = arg(
 
 // Version is inlined into the file using taskr build pipeline
 if (args['--version']) {
-  // tslint:disable-next-line
   console.log(`Next.js v${process.env.__NEXT_VERSION}`)
   process.exit(0)
 }
@@ -55,7 +53,6 @@ const foundCommand = Boolean(commands[args._[0]])
 // Makes sure the `next <subcommand> --help` case is covered
 // This help message is only showed for `next --help`
 if (!foundCommand && args['--help']) {
-  // tslint:disable-next-line
   console.log(`
     Usage
       $ next <command>
@@ -113,7 +110,6 @@ if (command === 'dev') {
   const { watchFile } = require('fs')
   watchFile(`${process.cwd()}/${CONFIG_FILE}`, (cur: any, prev: any) => {
     if (cur.size > 0 || prev.size > 0) {
-      // tslint:disable-next-line
       console.log(
         `\n> Found a change in ${CONFIG_FILE}. Restart the server to see the changes in effect.`
       )
diff --git a/packages/next/build/babel/plugins/next-page-config.ts b/packages/next/build/babel/plugins/next-page-config.ts
index adf724d854913..1e836f23dddb3 100644
--- a/packages/next/build/babel/plugins/next-page-config.ts
+++ b/packages/next/build/babel/plugins/next-page-config.ts
@@ -2,6 +2,8 @@ import { NodePath, PluginObj, types as BabelTypes } from '@babel/core'
 import { PageConfig } from 'next/types'
 import { STRING_LITERAL_DROP_BUNDLE } from '../../../next-server/lib/constants'
 
+const CONFIG_KEY = 'config'
+
 // replace program path with just a variable with the drop identifier
 function replaceBundle(path: any, t: typeof BabelTypes): void {
   path.parentPath.replaceWith(
@@ -41,27 +43,59 @@ export default function nextPageConfig({
         enter(path, state: ConfigState) {
           path.traverse(
             {
+              ExportDeclaration(exportPath, exportState) {
+                if (
+                  BabelTypes.isExportNamedDeclaration(exportPath) &&
+                  (exportPath.node as BabelTypes.ExportNamedDeclaration).specifiers?.some(
+                    (specifier) => {
+                      return specifier.exported.name === CONFIG_KEY
+                    }
+                  ) &&
+                  BabelTypes.isStringLiteral(
+                    (exportPath.node as BabelTypes.ExportNamedDeclaration)
+                      .source
+                  )
+                ) {
+                  throw new Error(
+                    errorMessage(
+                      exportState,
+                      'Expected object but got export from'
+                    )
+                  )
+                }
+              },
               ExportNamedDeclaration(
                 exportPath: NodePath<BabelTypes.ExportNamedDeclaration>,
                 exportState: any
               ) {
-                if (exportState.bundleDropped || !exportPath.node.declaration) {
-                  return
-                }
-
                 if (
-                  !BabelTypes.isVariableDeclaration(exportPath.node.declaration)
+                  exportState.bundleDropped ||
+                  (!exportPath.node.declaration &&
+                    exportPath.node.specifiers.length === 0)
                 ) {
                   return
                 }
 
-                const { declarations } = exportPath.node.declaration
                 const config: PageConfig = {}
+                const declarations = [
+                  ...(exportPath.node.declaration?.declarations || []),
+                  exportPath.scope.getBinding(CONFIG_KEY)?.path.node,
+                ].filter(Boolean)
 
                 for (const declaration of declarations) {
                   if (
-                    !BabelTypes.isIdentifier(declaration.id, { name: 'config' })
+                    !BabelTypes.isIdentifier(declaration.id, {
+                      name: CONFIG_KEY,
+                    })
                   ) {
+                    if (BabelTypes.isImportSpecifier(declaration)) {
+                      throw new Error(
+                        errorMessage(
+                          exportState,
+                          `Expected object but got import`
+                        )
+                      )
+                    }
                     continue
                   }
 
diff --git a/packages/next/build/index.ts b/packages/next/build/index.ts
index abb020b18f66f..40b44eddadd1e 100644
--- a/packages/next/build/index.ts
+++ b/packages/next/build/index.ts
@@ -286,7 +286,26 @@ export default async function build(
   }
 
   const routesManifestPath = path.join(distDir, ROUTES_MANIFEST)
-  const routesManifest: any = {
+  const routesManifest: {
+    version: number
+    pages404: boolean
+    basePath: string
+    redirects: Array<ReturnType<typeof buildCustomRoute>>
+    rewrites: Array<ReturnType<typeof buildCustomRoute>>
+    headers: Array<ReturnType<typeof buildCustomRoute>>
+    dynamicRoutes: Array<{
+      page: string
+      regex: string
+      namedRegex?: string
+      routeKeys?: { [key: string]: string }
+    }>
+    dataRoutes: Array<{
+      page: string
+      routeKeys?: { [key: string]: string }
+      dataRouteRegex: string
+      namedDataRouteRegex?: string
+    }>
+  } = {
     version: 3,
     pages404: true,
     basePath: config.basePath,
@@ -304,6 +323,7 @@ export default async function build(
           namedRegex: routeRegex.namedRegex,
         }
       }),
+    dataRoutes: [],
   }
 
   await promises.mkdir(distDir, { recursive: true })
@@ -325,6 +345,7 @@ export default async function build(
       target,
       pagesDir,
       entrypoints: entrypoints.client,
+      rewrites,
     }),
     getBaseWebpackConfig(dir, {
       tracer,
@@ -335,6 +356,7 @@ export default async function build(
       target,
       pagesDir,
       entrypoints: entrypoints.server,
+      rewrites,
     }),
   ])
 
@@ -654,6 +676,7 @@ export default async function build(
       'utf8'
     )
   }
+
   // Since custom _app.js can wrap the 404 page we have to opt-out of static optimization if it has getInitialProps
   // Only export the static 404 when there is no /_error present
   const useStatic404 =
@@ -1064,6 +1087,8 @@ export default async function build(
   await telemetry.flush()
 }
 
+export type ClientSsgManifest = Set<string>
+
 function generateClientSsgManifest(
   prerenderManifest: PrerenderManifest,
   {
@@ -1072,7 +1097,7 @@ function generateClientSsgManifest(
     isModern,
   }: { buildId: string; distDir: string; isModern: boolean }
 ) {
-  const ssgPages: Set<string> = new Set<string>([
+  const ssgPages: ClientSsgManifest = new Set<string>([
     ...Object.entries(prerenderManifest.routes)
       // Filter out dynamic routes
       .filter(([, { srcRoute }]) => srcRoute == null)
diff --git a/packages/next/build/webpack-config.ts b/packages/next/build/webpack-config.ts
index 7daa2d689af66..7b0a95aa220c2 100644
--- a/packages/next/build/webpack-config.ts
+++ b/packages/next/build/webpack-config.ts
@@ -54,6 +54,7 @@ import WebpackConformancePlugin, {
   ReactSyncScriptsConformanceCheck,
 } from './webpack/plugins/webpack-conformance-plugin'
 import { WellKnownErrorsPlugin } from './webpack/plugins/wellknown-errors-plugin'
+import { Rewrite } from '../lib/load-custom-routes'
 type ExcludesFalse = <T>(x: T | false) => x is T
 
 const isWebpack5 = parseInt(webpack.version!) === 5
@@ -190,6 +191,7 @@ export default async function getBaseWebpackConfig(
     target = 'server',
     reactProductionProfiling = false,
     entrypoints,
+    rewrites,
   }: {
     buildId: string
     config: any
@@ -200,6 +202,7 @@ export default async function getBaseWebpackConfig(
     tracer?: any
     reactProductionProfiling?: boolean
     entrypoints: WebpackEntrypoints
+    rewrites: Rewrite[]
   }
 ): Promise<webpack.Configuration> {
   const productionBrowserSourceMaps =
@@ -207,6 +210,8 @@ export default async function getBaseWebpackConfig(
   let plugins: PluginMetaData[] = []
   let babelPresetPlugins: { dir: string; config: any }[] = []
 
+  const hasRewrites = rewrites.length > 0 || dev
+
   if (config.experimental.plugins) {
     plugins = await collectPlugins(dir, config.env, config.plugins)
     pluginLoaderOptions.plugins = plugins
@@ -232,7 +237,8 @@ export default async function getBaseWebpackConfig(
         distDir,
         pagesDir,
         cwd: dir,
-        cache: true,
+        // Webpack 5 has a built-in loader cache
+        cache: !config.experimental.unstable_webpack5cache,
         babelPresetPlugins,
         hasModern: !!config.experimental.modern,
         development: dev,
@@ -326,6 +332,10 @@ export default async function getBaseWebpackConfig(
     }
   }
 
+  const clientResolveRewrites = require.resolve(
+    'next/dist/next-server/lib/router/utils/resolve-rewrites'
+  )
+
   const resolveConfig = {
     // Disable .mjs for node_modules bundling
     extensions: isServer
@@ -370,6 +380,9 @@ export default async function getBaseWebpackConfig(
       [DOT_NEXT_ALIAS]: distDir,
       ...getOptimizedAliases(isServer),
       ...getReactProfilingInProduction(),
+      [clientResolveRewrites]: hasRewrites
+        ? clientResolveRewrites
+        : require.resolve('next/dist/client/dev/noop.js'),
     },
     mainFields: isServer ? ['main', 'module'] : ['browser', 'module', 'main'],
     plugins: isWebpack5
@@ -938,6 +951,7 @@ export default async function getBaseWebpackConfig(
           config.experimental.scrollRestoration
         ),
         'process.env.__NEXT_ROUTER_BASEPATH': JSON.stringify(config.basePath),
+        'process.env.__NEXT_HAS_REWRITES': JSON.stringify(hasRewrites),
         ...(isServer
           ? {
               // Fix bad-actors in the npm ecosystem (e.g. `node-formidable`)
@@ -1010,6 +1024,7 @@ export default async function getBaseWebpackConfig(
       !isServer &&
         new BuildManifestPlugin({
           buildId,
+          rewrites,
           modern: config.experimental.modern,
         }),
       tracer &&
@@ -1103,6 +1118,14 @@ export default async function getBaseWebpackConfig(
       }
       webpackConfig.optimization.usedExports = false
     }
+
+    // Enable webpack 5 caching
+    if (config.experimental.unstable_webpack5cache) {
+      webpackConfig.cache = {
+        type: 'filesystem',
+        cacheDirectory: path.join(dir, '.next', 'cache', 'webpack'),
+      }
+    }
   }
 
   webpackConfig = await buildConfiguration(webpackConfig, {
diff --git a/packages/next/build/webpack/loaders/next-serverless-loader.ts b/packages/next/build/webpack/loaders/next-serverless-loader.ts
index da5a2182c6e7c..69885cff071c4 100644
--- a/packages/next/build/webpack/loaders/next-serverless-loader.ts
+++ b/packages/next/build/webpack/loaders/next-serverless-loader.ts
@@ -147,7 +147,7 @@ const nextServerlessLoader: loader.Loader = function () {
 
   const handleRewrites = `
     const getCustomRouteMatcher = pathMatch(true)
-    const {prepareDestination} = require('next/dist/next-server/server/router')
+    const prepareDestination = require('next/dist/next-server/lib/router/utils/prepare-destination').default
 
     function handleRewrites(parsedUrl) {
       for (const rewrite of rewrites) {
@@ -163,7 +163,7 @@ const nextServerlessLoader: loader.Loader = function () {
             "${basePath}"
           )
 
-          Object.assign(parsedUrl.query, parsedDestination.query, params)
+          Object.assign(parsedUrl.query, parsedDestination.query)
           delete parsedDestination.query
 
           Object.assign(parsedUrl, parsedDestination)
@@ -455,6 +455,29 @@ const nextServerlessLoader: loader.Loader = function () {
             : ''
         }
 
+        // normalize request URL/asPath for fallback pages since the proxy
+        // sets the request URL to the output's path for fallback pages
+        ${
+          pageIsDynamicRoute
+            ? `
+            if (nowParams) {
+              const _parsedUrl = parseUrl(req.url)
+
+              for (const param of Object.keys(defaultRouteRegex.groups)) {
+                const paramIdx = _parsedUrl.pathname.indexOf(\`[\${param}]\`)
+
+                if (paramIdx > -1) {
+                  _parsedUrl.pathname = _parsedUrl.pathname.substr(0, paramIdx) +
+                    encodeURI(nowParams[param]) +
+                    _parsedUrl.pathname.substr(paramIdx + param.length + 2)
+                }
+              }
+              req.url = formatUrl(_parsedUrl)
+            }
+          `
+            : ``
+        }
+
         const isFallback = parsedUrl.query.__nextFallback
 
         const previewData = tryGetPreviewData(req, res, options.previewProps)
diff --git a/packages/next/build/webpack/plugins/build-manifest-plugin.ts b/packages/next/build/webpack/plugins/build-manifest-plugin.ts
index c530823acca42..54401f2ea9c25 100644
--- a/packages/next/build/webpack/plugins/build-manifest-plugin.ts
+++ b/packages/next/build/webpack/plugins/build-manifest-plugin.ts
@@ -12,19 +12,32 @@ import {
 import { BuildManifest } from '../../../next-server/server/get-page-files'
 import getRouteFromEntrypoint from '../../../next-server/server/get-route-from-entrypoint'
 import { ampFirstEntryNamesMap } from './next-drop-client-page-plugin'
+import { Rewrite } from '../../../lib/load-custom-routes'
+import { getSortedRoutes } from '../../../next-server/lib/router/utils'
 
 const isWebpack5 = parseInt(webpack.version!) === 5
 
+type DeepMutable<T> = { -readonly [P in keyof T]: DeepMutable<T[P]> }
+
+export type ClientBuildManifest = Record<string, string[]>
+
 // This function takes the asset map generated in BuildManifestPlugin and creates a
 // reduced version to send to the client.
 function generateClientManifest(
   assetMap: BuildManifest,
-  isModern: boolean
+  isModern: boolean,
+  rewrites: Rewrite[]
 ): string {
-  const clientManifest: { [s: string]: string[] } = {}
+  const clientManifest: ClientBuildManifest = {
+    // TODO: update manifest type to include rewrites
+    __rewrites: rewrites as any,
+  }
   const appDependencies = new Set(assetMap.pages['/_app'])
+  const sortedPageKeys = getSortedRoutes(Object.keys(assetMap.pages))
+
+  sortedPageKeys.forEach((page) => {
+    const dependencies = assetMap.pages[page]
 
-  Object.entries(assetMap.pages).forEach(([page, dependencies]) => {
     if (page === '/_app') return
     // Filter out dependencies in the _app entry, because those will have already
     // been loaded by the client prior to a navigation event
@@ -39,6 +52,10 @@ function generateClientManifest(
       clientManifest[page] = filteredDeps
     }
   })
+  // provide the sorted pages as an array so we don't rely on the object's keys
+  // being in order and we don't slow down look-up time for page assets
+  clientManifest.sortedPages = sortedPageKeys
+
   return devalue(clientManifest)
 }
 
@@ -63,16 +80,31 @@ function getFilesArray(files: any) {
 export default class BuildManifestPlugin {
   private buildId: string
   private modern: boolean
+  private rewrites: Rewrite[]
 
-  constructor(options: { buildId: string; modern: boolean }) {
+  constructor(options: {
+    buildId: string
+    modern: boolean
+    rewrites: Rewrite[]
+  }) {
     this.buildId = options.buildId
     this.modern = options.modern
+    this.rewrites = options.rewrites.map((r) => {
+      const rewrite = { ...r }
+
+      // omit external rewrite destinations since these aren't
+      // handled client-side
+      if (!rewrite.destination.startsWith('/')) {
+        delete rewrite.destination
+      }
+      return rewrite
+    })
   }
 
   createAssets(compilation: any, assets: any) {
     const namedChunks: Map<string, CompilationType.Chunk> =
       compilation.namedChunks
-    const assetMap: BuildManifest = {
+    const assetMap: DeepMutable<BuildManifest> = {
       polyfillFiles: [],
       devFiles: [],
       ampDevFiles: [],
@@ -183,7 +215,8 @@ export default class BuildManifestPlugin {
     assets[clientManifestPath] = new RawSource(
       `self.__BUILD_MANIFEST = ${generateClientManifest(
         assetMap,
-        false
+        false,
+        this.rewrites
       )};self.__BUILD_MANIFEST_CB && self.__BUILD_MANIFEST_CB()`
     )
 
@@ -193,7 +226,8 @@ export default class BuildManifestPlugin {
       assets[modernClientManifestPath] = new RawSource(
         `self.__BUILD_MANIFEST = ${generateClientManifest(
           assetMap,
-          true
+          true,
+          this.rewrites
         )};self.__BUILD_MANIFEST_CB && self.__BUILD_MANIFEST_CB()`
       )
     }
diff --git a/packages/next/build/webpack/plugins/css-minimizer-plugin.ts b/packages/next/build/webpack/plugins/css-minimizer-plugin.ts
index 1cd2c75fa287a..f9c0c4cea7b37 100644
--- a/packages/next/build/webpack/plugins/css-minimizer-plugin.ts
+++ b/packages/next/build/webpack/plugins/css-minimizer-plugin.ts
@@ -11,6 +11,8 @@ type CssMinimizerPluginOptions = {
   }
 }
 
+const isWebpack5 = parseInt(webpack.version!) === 5
+
 export class CssMinimizerPlugin {
   __next_css_remove = true
 
@@ -20,8 +22,55 @@ export class CssMinimizerPlugin {
     this.options = options
   }
 
+  optimizeAsset(file: string, asset: any) {
+    const postcssOptions = {
+      ...this.options.postcssOptions,
+      to: file,
+      from: file,
+    }
+
+    let input: string
+    if (postcssOptions.map && asset.sourceAndMap) {
+      const { source, map } = asset.sourceAndMap()
+      input = source
+      postcssOptions.map.prev = map ? map : false
+    } else {
+      input = asset.source()
+    }
+
+    return minify(input, postcssOptions).then((res) => {
+      if (res.map) {
+        return new SourceMapSource(res.css, file, res.map.toJSON())
+      } else {
+        return new RawSource(res.css)
+      }
+    })
+  }
+
   apply(compiler: webpack.Compiler) {
     compiler.hooks.compilation.tap('CssMinimizerPlugin', (compilation: any) => {
+      if (isWebpack5) {
+        compilation.hooks.processAssets.tapPromise(
+          {
+            name: 'CssMinimizerPlugin',
+            // @ts-ignore TODO: Remove ignore when webpack 5 is stable
+            stage: webpack.Compilation.PROCESS_ASSETS_STAGE_OPTIMIZE_SIZE,
+          },
+          async (assets: any) => {
+            const files = Object.keys(assets)
+            await Promise.all(
+              files
+                .filter((file) => CSS_REGEX.test(file))
+                .map(async (file) => {
+                  const asset = compilation.assets[file]
+
+                  assets[file] = await this.optimizeAsset(file, asset)
+                })
+            )
+          }
+        )
+        return
+      }
       compilation.hooks.optimizeChunkAssets.tapPromise(
         'CssMinimizerPlugin',
         (chunks: webpack.compilation.Chunk[]) =>
@@ -32,35 +81,10 @@ export class CssMinimizerPlugin {
                 [] as string[]
               )
               .filter((entry) => CSS_REGEX.test(entry))
-              .map((file) => {
-                const postcssOptions = {
-                  ...this.options.postcssOptions,
-                  to: file,
-                  from: file,
-                }
-
+              .map(async (file) => {
                 const asset = compilation.assets[file]
 
-                let input: string
-                if (postcssOptions.map && asset.sourceAndMap) {
-                  const { source, map } = asset.sourceAndMap()
-                  input = source
-                  postcssOptions.map.prev = map ? map : false
-                } else {
-                  input = asset.source()
-                }
-
-                return minify(input, postcssOptions).then((res) => {
-                  if (res.map) {
-                    compilation.assets[file] = new SourceMapSource(
-                      res.css,
-                      file,
-                      res.map.toJSON()
-                    )
-                  } else {
-                    compilation.assets[file] = new RawSource(res.css)
-                  }
-                })
+                compilation.assets[file] = await this.optimizeAsset(file, asset)
               })
           )
       )
diff --git a/packages/next/cli/next-dev.ts b/packages/next/cli/next-dev.ts
index 88bc9fbf7cb34..ed044bbd1b521 100755
--- a/packages/next/cli/next-dev.ts
+++ b/packages/next/cli/next-dev.ts
@@ -30,7 +30,6 @@ const nextDev: cliCommand = (argv) => {
     throw error
   }
   if (args['--help']) {
-    // tslint:disable-next-line
     console.log(`
       Description
         Starts the application in development mode (hot-code reloading, error
@@ -67,7 +66,11 @@ const nextDev: cliCommand = (argv) => {
       cwd: dir,
       name: 'react',
     })
-    if (reactVersion && semver.lt(reactVersion, '16.10.0')) {
+    if (
+      reactVersion &&
+      semver.lt(reactVersion, '16.10.0') &&
+      semver.coerce(reactVersion)?.version !== '0.0.0'
+    ) {
       Log.warn(
         'Fast Refresh is disabled in your application due to an outdated `react` version. Please upgrade 16.10 or newer!' +
           ' Read more: https://err.sh/next.js/react-version'
@@ -77,7 +80,11 @@ const nextDev: cliCommand = (argv) => {
         cwd: dir,
         name: 'react-dom',
       })
-      if (reactDomVersion && semver.lt(reactDomVersion, '16.10.0')) {
+      if (
+        reactDomVersion &&
+        semver.lt(reactDomVersion, '16.10.0') &&
+        semver.coerce(reactDomVersion)?.version !== '0.0.0'
+      ) {
         Log.warn(
           'Fast Refresh is disabled in your application due to an outdated `react-dom` version. Please upgrade 16.10 or newer!' +
             ' Read more: https://err.sh/next.js/react-version'
@@ -119,10 +126,8 @@ const nextDev: cliCommand = (argv) => {
             errorMessage += `\nUse \`npm run ${nextScript[0]} -- -p <some other port>\`.`
           }
         }
-        // tslint:disable-next-line
         console.error(errorMessage)
       } else {
-        // tslint:disable-next-line
         console.error(err)
       }
       process.nextTick(() => process.exit(1))
diff --git a/packages/next/cli/next-export.ts b/packages/next/cli/next-export.ts
index 55a959892ceb1..f13533bd26095 100755
--- a/packages/next/cli/next-export.ts
+++ b/packages/next/cli/next-export.ts
@@ -29,7 +29,6 @@ const nextExport: cliCommand = (argv) => {
     throw error
   }
   if (args['--help']) {
-    // tslint:disable-next-line
     console.log(`
       Description
         Exports the application for production deployment
diff --git a/packages/next/cli/next-start.ts b/packages/next/cli/next-start.ts
index 78a71bb95dc9f..d84e04ebada2e 100755
--- a/packages/next/cli/next-start.ts
+++ b/packages/next/cli/next-start.ts
@@ -29,7 +29,6 @@ const nextStart: cliCommand = (argv) => {
     throw error
   }
   if (args['--help']) {
-    // tslint:disable-next-line
     console.log(`
       Description
         Starts the application in production mode.
@@ -53,14 +52,12 @@ const nextStart: cliCommand = (argv) => {
   const port = args['--port'] || 3000
   startServer({ dir }, port, args['--hostname'])
     .then(async (app) => {
-      // tslint:disable-next-line
       Log.ready(
         `started server on http://${args['--hostname'] || 'localhost'}:${port}`
       )
       await app.prepare()
     })
     .catch((err) => {
-      // tslint:disable-next-line
       console.error(err)
       process.exit(1)
     })
diff --git a/packages/next/client/dev/error-overlay/eventsource.js b/packages/next/client/dev/error-overlay/eventsource.js
index dd87e84a64064..163cffc98e0b2 100644
--- a/packages/next/client/dev/error-overlay/eventsource.js
+++ b/packages/next/client/dev/error-overlay/eventsource.js
@@ -33,9 +33,11 @@ function EventSourceWrapper(options) {
     for (var i = 0; i < listeners.length; i++) {
       listeners[i](event)
     }
-    if (event.data.indexOf('action') !== -1) {
-      eventCallbacks.forEach((cb) => cb(event))
-    }
+
+    eventCallbacks.forEach((cb) => {
+      if (!cb.unfiltered && event.data.indexOf('action') === -1) return
+      cb(event)
+    })
   }
 
   function handleDisconnect() {
diff --git a/packages/next/client/head-manager.js b/packages/next/client/head-manager.ts
similarity index 69%
rename from packages/next/client/head-manager.js
rename to packages/next/client/head-manager.ts
index eccf2fc1a4aa9..424613f75db21 100644
--- a/packages/next/client/head-manager.js
+++ b/packages/next/client/head-manager.ts
@@ -1,11 +1,11 @@
-const DOMAttributeNames = {
+const DOMAttributeNames: Record<string, string> = {
   acceptCharset: 'accept-charset',
   className: 'class',
   htmlFor: 'for',
   httpEquiv: 'http-equiv',
 }
 
-function reactElementToDOM({ type, props }) {
+function reactElementToDOM({ type, props }: JSX.Element): HTMLElement {
   const el = document.createElement(type)
   for (const p in props) {
     if (!props.hasOwnProperty(p)) continue
@@ -27,9 +27,11 @@ function reactElementToDOM({ type, props }) {
   return el
 }
 
-function updateElements(type, components) {
+function updateElements(type: string, components: JSX.Element[]) {
   const headEl = document.getElementsByTagName('head')[0]
-  const headCountEl = headEl.querySelector('meta[name=next-head-count]')
+  const headCountEl: HTMLMetaElement = headEl.querySelector(
+    'meta[name=next-head-count]'
+  ) as HTMLMetaElement
   if (process.env.NODE_ENV !== 'production') {
     if (!headCountEl) {
       console.error(
@@ -40,44 +42,46 @@ function updateElements(type, components) {
   }
 
   const headCount = Number(headCountEl.content)
-  const oldTags = []
+  const oldTags: Element[] = []
 
   for (
     let i = 0, j = headCountEl.previousElementSibling;
     i < headCount;
-    i++, j = j.previousElementSibling
+    i++, j = j!.previousElementSibling
   ) {
-    if (j.tagName.toLowerCase() === type) {
-      oldTags.push(j)
+    if (j!.tagName.toLowerCase() === type) {
+      oldTags.push(j!)
     }
   }
-  const newTags = components.map(reactElementToDOM).filter((newTag) => {
-    for (let k = 0, len = oldTags.length; k < len; k++) {
-      const oldTag = oldTags[k]
-      if (oldTag.isEqualNode(newTag)) {
-        oldTags.splice(k, 1)
-        return false
+  const newTags = (components.map(reactElementToDOM) as HTMLElement[]).filter(
+    (newTag) => {
+      for (let k = 0, len = oldTags.length; k < len; k++) {
+        const oldTag = oldTags[k]
+        if (oldTag.isEqualNode(newTag)) {
+          oldTags.splice(k, 1)
+          return false
+        }
       }
+      return true
     }
-    return true
-  })
+  )
 
-  oldTags.forEach((t) => t.parentNode.removeChild(t))
+  oldTags.forEach((t) => t.parentNode!.removeChild(t))
   newTags.forEach((t) => headEl.insertBefore(t, headCountEl))
   headCountEl.content = (headCount - oldTags.length + newTags.length).toString()
 }
 
 export default function initHeadManager() {
-  let updatePromise = null
+  let updatePromise: Promise<void> | null = null
 
   return {
     mountedInstances: new Set(),
-    updateHead: (head) => {
+    updateHead: (head: JSX.Element[]) => {
       const promise = (updatePromise = Promise.resolve().then(() => {
         if (promise !== updatePromise) return
 
         updatePromise = null
-        const tags = {}
+        const tags: Record<string, JSX.Element[]> = {}
 
         head.forEach((h) => {
           const components = tags[h.type] || []
diff --git a/packages/next/client/index.js b/packages/next/client/index.tsx
similarity index 60%
rename from packages/next/client/index.js
rename to packages/next/client/index.tsx
index 4314dead73b79..aee6099798718 100644
--- a/packages/next/client/index.js
+++ b/packages/next/client/index.tsx
@@ -1,27 +1,53 @@
 /* global location */
-import { createRouter, makePublicRouterInstance } from 'next/router'
-import * as querystring from '../next-server/lib/router/utils/querystring'
 import React from 'react'
 import ReactDOM from 'react-dom'
 import { HeadManagerContext } from '../next-server/lib/head-manager-context'
 import mitt from '../next-server/lib/mitt'
 import { RouterContext } from '../next-server/lib/router-context'
+import { delBasePath, hasBasePath } from '../next-server/lib/router/router'
+import type Router from '../next-server/lib/router/router'
+import type {
+  AppComponent,
+  AppProps,
+  PrivateRouteInfo,
+} from '../next-server/lib/router/router'
 import { isDynamicRoute } from '../next-server/lib/router/utils/is-dynamic'
+import * as querystring from '../next-server/lib/router/utils/querystring'
 import * as envConfig from '../next-server/lib/runtime-config'
 import { getURL, loadGetInitialProps, ST } from '../next-server/lib/utils'
-import { hasBasePath, delBasePath } from '../next-server/lib/router/router'
+import type { NEXT_DATA } from '../next-server/lib/utils'
 import initHeadManager from './head-manager'
-import PageLoader from './page-loader'
+import PageLoader, { createLink } from './page-loader'
 import measureWebVitals from './performance-relayer'
+import { createRouter, makePublicRouterInstance } from './router'
 
 /// <reference types="react-dom/experimental" />
 
+declare let __webpack_public_path__: string
+
+declare global {
+  interface Window {
+    /* test fns */
+    __NEXT_HYDRATED?: boolean
+    __NEXT_HYDRATED_CB?: () => void
+
+    /* prod */
+    __NEXT_PRELOADREADY?: (ids?: string[]) => void
+    __NEXT_DATA__: NEXT_DATA
+    __NEXT_P: any[]
+  }
+}
+
+type RenderRouteInfo = PrivateRouteInfo & { App: AppComponent }
+type RenderErrorProps = Omit<RenderRouteInfo, 'Component' | 'styleSheets'>
+
 if (!('finally' in Promise.prototype)) {
-  // eslint-disable-next-line no-extend-native
-  Promise.prototype.finally = require('next/dist/build/polyfills/finally-polyfill.min')
+  ;(Promise.prototype as PromiseConstructor['prototype']).finally = require('next/dist/build/polyfills/finally-polyfill.min')
 }
 
-const data = JSON.parse(document.getElementById('__NEXT_DATA__').textContent)
+const data: typeof window['__NEXT_DATA__'] = JSON.parse(
+  document.getElementById('__NEXT_DATA__')!.textContent!
+)
 window.__NEXT_DATA__ = data
 
 export const version = process.env.__NEXT_VERSION
@@ -56,28 +82,40 @@ if (hasBasePath(asPath)) {
   asPath = delBasePath(asPath)
 }
 
-const pageLoader = new PageLoader(buildId, prefix, page)
-const register = ([r, f]) => pageLoader.registerPage(r, f)
+type RegisterFn = (input: [string, () => void]) => void
+
+const pageLoader = new PageLoader(
+  buildId,
+  prefix,
+  page,
+  [].slice
+    .call(document.querySelectorAll('link[rel=stylesheet][data-n-p]'))
+    .map((e: HTMLLinkElement) => e.getAttribute('href')!)
+)
+const register: RegisterFn = ([r, f]) => pageLoader.registerPage(r, f)
 if (window.__NEXT_P) {
   // Defer page registration for another tick. This will increase the overall
   // latency in hydrating the page, but reduce the total blocking time.
   window.__NEXT_P.map((p) => setTimeout(() => register(p), 0))
 }
 window.__NEXT_P = []
-window.__NEXT_P.push = register
+;(window.__NEXT_P as any).push = register
 
 const headManager = initHeadManager()
 const appElement = document.getElementById('__next')
 
-let lastAppProps
-let lastRenderReject
-let webpackHMR
-export let router
-let CachedComponent
-let CachedApp, onPerfEntry
-
-class Container extends React.Component {
-  componentDidCatch(componentErr, info) {
+let lastAppProps: AppProps
+let lastRenderReject: (() => void) | null
+let webpackHMR: any
+export let router: Router
+let CachedComponent: React.ComponentType
+let cachedStyleSheets: string[]
+let CachedApp: AppComponent, onPerfEntry: (metric: any) => void
+
+class Container extends React.Component<{
+  fn: (err: Error, info?: any) => void
+}> {
+  componentDidCatch(componentErr: Error, info: any) {
     this.props.fn(componentErr, info)
   }
 
@@ -107,6 +145,7 @@ class Container extends React.Component {
           ),
         asPath,
         {
+          // @ts-ignore
           // WARNING: `_h` is an internal option for handing Next.js
           // client-side hydration. Your app should _never_ use this property.
           // It may change at any time without notice.
@@ -149,8 +188,7 @@ class Container extends React.Component {
   render() {
     if (process.env.NODE_ENV === 'production') {
       return this.props.children
-    }
-    if (process.env.NODE_ENV !== 'production') {
+    } else {
       const { ReactDevOverlay } = require('@next/react-dev-overlay/lib/client')
       return <ReactDevOverlay>{this.props.children}</ReactDevOverlay>
     }
@@ -159,13 +197,13 @@ class Container extends React.Component {
 
 export const emitter = mitt()
 
-export default async ({ webpackHMR: passedWebpackHMR } = {}) => {
+export default async (opts: { webpackHMR?: any } = {}) => {
   // This makes sure this specific lines are removed in production
   if (process.env.NODE_ENV === 'development') {
-    webpackHMR = passedWebpackHMR
+    webpackHMR = opts.webpackHMR
   }
   const { page: app, mod } = await pageLoader.loadPage('/_app')
-  CachedApp = app
+  CachedApp = app as AppComponent
 
   if (mod && mod.reportWebVitals) {
     onPerfEntry = ({
@@ -203,7 +241,10 @@ export default async ({ webpackHMR: passedWebpackHMR } = {}) => {
   let initialErr = hydrateErr
 
   try {
-    ;({ page: CachedComponent } = await pageLoader.loadPage(page))
+    ;({
+      page: CachedComponent,
+      styleSheets: cachedStyleSheets,
+    } = await pageLoader.loadPage(page))
 
     if (process.env.NODE_ENV !== 'production') {
       const { isValidElementType } = require('react-is')
@@ -230,13 +271,13 @@ export default async ({ webpackHMR: passedWebpackHMR } = {}) => {
             // Generate a new error object. We `throw` it because some browsers
             // will set the `stack` when thrown, and we want to ensure ours is
             // not overridden when we re-throw it below.
-            throw new Error(initialErr.message)
+            throw new Error(initialErr!.message)
           } catch (e) {
             error = e
           }
 
-          error.name = initialErr.name
-          error.stack = initialErr.stack
+          error.name = initialErr!.name
+          error.stack = initialErr!.stack
 
           const node = getNodeError(error)
           throw node
@@ -261,15 +302,17 @@ export default async ({ webpackHMR: passedWebpackHMR } = {}) => {
     pageLoader,
     App: CachedApp,
     Component: CachedComponent,
+    initialStyleSheets: cachedStyleSheets,
     wrapApp,
     err: initialErr,
-    isFallback,
-    subscription: ({ Component, props, err }, App) =>
-      render({ App, Component, props, err }),
+    isFallback: Boolean(isFallback),
+    subscription: ({ Component, styleSheets, props, err }, App) =>
+      render({ App, Component, styleSheets, props, err }),
   })
 
   // call init-client middleware
   if (process.env.__NEXT_PLUGINS) {
+    // @ts-ignore
     // eslint-disable-next-line
     import('next-plugin-loader?middleware=on-init-client!')
       .then((initClientModule) => {
@@ -283,6 +326,7 @@ export default async ({ webpackHMR: passedWebpackHMR } = {}) => {
   const renderCtx = {
     App: CachedApp,
     Component: CachedComponent,
+    styleSheets: cachedStyleSheets,
     props: hydrateProps,
     err: initialErr,
   }
@@ -290,14 +334,12 @@ export default async ({ webpackHMR: passedWebpackHMR } = {}) => {
   if (process.env.NODE_ENV === 'production') {
     render(renderCtx)
     return emitter
-  }
-
-  if (process.env.NODE_ENV !== 'production') {
+  } else {
     return { emitter, render, renderCtx }
   }
 }
 
-export async function render(renderingProps) {
+export async function render(renderingProps: RenderRouteInfo) {
   if (renderingProps.err) {
     await renderError(renderingProps)
     return
@@ -319,7 +361,7 @@ export async function render(renderingProps) {
 // This method handles all runtime and debug errors.
 // 404 and 500 errors are special kind of errors
 // and they are still handle via the main render method.
-export function renderError(renderErrorProps) {
+export function renderError(renderErrorProps: RenderErrorProps) {
   const { App, err } = renderErrorProps
 
   // In development runtime errors are caught by our overlay
@@ -335,10 +377,11 @@ export function renderError(renderErrorProps) {
       App: () => null,
       props: {},
       Component: () => null,
-      err: null,
+      styleSheets: [],
     })
   }
   if (process.env.__NEXT_PLUGINS) {
+    // @ts-ignore
     // eslint-disable-next-line
     import('next-plugin-loader?middleware=on-error-client!')
       .then((onClientErrorModule) => {
@@ -354,43 +397,46 @@ export function renderError(renderErrorProps) {
 
   // Make sure we log the error to the console, otherwise users can't track down issues.
   console.error(err)
-  return pageLoader.loadPage('/_error').then(({ page: ErrorComponent }) => {
-    // In production we do a normal render with the `ErrorComponent` as component.
-    // If we've gotten here upon initial render, we can use the props from the server.
-    // Otherwise, we need to call `getInitialProps` on `App` before mounting.
-    const AppTree = wrapApp(App)
-    const appCtx = {
-      Component: ErrorComponent,
-      AppTree,
-      router,
-      ctx: { err, pathname: page, query, asPath, AppTree },
-    }
-    return Promise.resolve(
-      renderErrorProps.props
-        ? renderErrorProps.props
-        : loadGetInitialProps(App, appCtx)
-    ).then((initProps) =>
-      doRender({
-        ...renderErrorProps,
-        err,
+  return pageLoader
+    .loadPage('/_error')
+    .then(({ page: ErrorComponent, styleSheets }) => {
+      // In production we do a normal render with the `ErrorComponent` as component.
+      // If we've gotten here upon initial render, we can use the props from the server.
+      // Otherwise, we need to call `getInitialProps` on `App` before mounting.
+      const AppTree = wrapApp(App)
+      const appCtx = {
         Component: ErrorComponent,
-        props: initProps,
-      })
-    )
-  })
+        AppTree,
+        router,
+        ctx: { err, pathname: page, query, asPath, AppTree },
+      }
+      return Promise.resolve(
+        renderErrorProps.props
+          ? renderErrorProps.props
+          : loadGetInitialProps(App, appCtx)
+      ).then((initProps) =>
+        doRender({
+          ...renderErrorProps,
+          err,
+          Component: ErrorComponent,
+          styleSheets,
+          props: initProps,
+        })
+      )
+    })
 }
 
 // If hydrate does not exist, eg in preact.
 let isInitialRender = typeof ReactDOM.hydrate === 'function'
-let reactRoot = null
-function renderReactElement(reactEl, domEl) {
+let reactRoot: any = null
+function renderReactElement(reactEl: JSX.Element, domEl: HTMLElement) {
   if (process.env.__NEXT_REACT_MODE !== 'legacy') {
     if (!reactRoot) {
       const opts = { hydrate: true }
       reactRoot =
         process.env.__NEXT_REACT_MODE === 'concurrent'
-          ? ReactDOM.unstable_createRoot(domEl, opts)
-          : ReactDOM.unstable_createBlockingRoot(domEl, opts)
+          ? (ReactDOM as any).unstable_createRoot(domEl, opts)
+          : (ReactDOM as any).unstable_createBlockingRoot(domEl, opts)
     }
     reactRoot.render(reactEl)
   } else {
@@ -468,7 +514,9 @@ function clearMarks() {
   ].forEach((mark) => performance.clearMarks(mark))
 }
 
-function AppContainer({ children }) {
+function AppContainer({
+  children,
+}: React.PropsWithChildren<{}>): React.ReactElement {
   return (
     <Container
       fn={(error) =>
@@ -486,8 +534,10 @@ function AppContainer({ children }) {
   )
 }
 
-const wrapApp = (App) => (wrappedAppProps) => {
-  const appProps = {
+const wrapApp = (App: AppComponent) => (
+  wrappedAppProps: Record<string, any>
+) => {
+  const appProps: AppProps = {
     ...wrappedAppProps,
     Component: CachedComponent,
     err: hydrateErr,
@@ -500,15 +550,26 @@ const wrapApp = (App) => (wrappedAppProps) => {
   )
 }
 
-async function doRender({ App, Component, props, err }) {
+async function doRender({
+  App,
+  Component,
+  props,
+  err,
+  styleSheets,
+}: RenderRouteInfo) {
   Component = Component || lastAppProps.Component
   props = props || lastAppProps.props
 
-  const appProps = { ...props, Component, err, router }
+  const appProps: AppProps = {
+    ...props,
+    Component,
+    err,
+    router,
+  }
   // lastAppProps has to be set before ReactDom.render to account for ReactDom throwing an error.
   lastAppProps = appProps
 
-  let resolvePromise
+  let resolvePromise: () => void
   const renderPromise = new Promise((resolve, reject) => {
     if (lastRenderReject) {
       lastRenderReject()
@@ -523,8 +584,111 @@ async function doRender({ App, Component, props, err }) {
     }
   })
 
+  // TODO: consider replacing this with real `<style>` tags that have
+  // plain-text CSS content that's provided by RouteInfo. That'd remove the
+  // need for the staging `<link>`s and the ability for CSS to be missing at
+  // this phase, allowing us to remove the error handling flow that reloads the
+  // page.
+  function onStart(): Promise<void[]> {
+    if (
+      // We can skip this during hydration. Running it wont cause any harm, but
+      // we may as well save the CPU cycles.
+      isInitialRender ||
+      // We use `style-loader` in development, so we don't need to do anything
+      // unless we're in production:
+      process.env.NODE_ENV !== 'production'
+    ) {
+      return Promise.resolve([])
+    }
+
+    let referenceNode: HTMLLinkElement | undefined = ([].slice.call(
+      document.querySelectorAll('link[data-n-g], link[data-n-p]')
+    ) as HTMLLinkElement[]).pop()
+
+    const required: Promise<void>[] = styleSheets.map((href) => {
+      const [link, promise] = createLink(href, 'stylesheet')
+      link.setAttribute('data-n-staging', '')
+      // Media `none` does not work in Firefox, so `print` is more
+      // cross-browser. Since this is so short lived we don't have to worry
+      // about style thrashing in a print view (where no routing is going to be
+      // happening anyway).
+      link.setAttribute('media', 'print')
+      if (referenceNode) {
+        referenceNode.parentNode!.insertBefore(link, referenceNode.nextSibling)
+        referenceNode = link
+      } else {
+        document.head.appendChild(link)
+      }
+      return promise
+    })
+    return Promise.all(required).catch(() => {
+      // This is too late in the rendering lifecycle to use the existing
+      // `PAGE_LOAD_ERROR` flow (via `handleRouteInfoError`).
+      // To match that behavior, we request the page to reload with the current
+      // asPath. This is already set at this phase since we "committed" to the
+      // render.
+      // This handles an edge case where a new deployment is rolled during
+      // client-side transition and the CSS assets are missing.
+
+      // This prevents:
+      //   1. An unstyled page from being rendered (old behavior)
+      //   2. The `/_error` page being rendered (we want to reload for the new
+      //      deployment)
+      window.location.href = router.asPath
+
+      // Instead of rethrowing the CSS loading error, we give a promise that
+      // won't resolve. This pauses the rendering process until the page
+      // reloads. Re-throwing the error could result in a flash of error page.
+      // throw cssLoadingError
+      return new Promise(() => {})
+    })
+  }
+
+  function onAbort() {
+    ;([].slice.call(
+      document.querySelectorAll('link[data-n-staging]')
+    ) as HTMLLinkElement[]).forEach((el) => {
+      el.parentNode!.removeChild(el)
+    })
+  }
+  renderPromise.catch((abortError) => {
+    onAbort()
+    throw abortError
+  })
+
+  function onCommit() {
+    if (
+      // We can skip this during hydration. Running it wont cause any harm, but
+      // we may as well save the CPU cycles.
+      !isInitialRender &&
+      // We use `style-loader` in development, so we don't need to do anything
+      // unless we're in production:
+      process.env.NODE_ENV === 'production'
+    ) {
+      // Remove old stylesheets:
+      ;([].slice.call(
+        document.querySelectorAll('link[data-n-p]')
+      ) as HTMLLinkElement[]).forEach((el) => el.parentNode!.removeChild(el))
+
+      // Activate new stylesheets:
+      ;[].slice
+        .call(document.querySelectorAll('link[data-n-staging]'))
+        .forEach((el: HTMLLinkElement) => {
+          el.removeAttribute('data-n-staging')
+          el.removeAttribute('media')
+          el.setAttribute('data-n-p', '')
+        })
+
+      // Force browser to recompute layout, which prevents a flash of unstyled
+      // content:
+      getComputedStyle(document.body, 'height')
+    }
+
+    resolvePromise()
+  }
+
   const elem = (
-    <Root callback={resolvePromise}>
+    <Root callback={onCommit}>
       <AppContainer>
         <App {...appProps} />
       </AppContainer>
@@ -532,21 +696,27 @@ async function doRender({ App, Component, props, err }) {
   )
 
   // We catch runtime errors using componentDidCatch which will trigger renderError
+  await onStart()
   renderReactElement(
     process.env.__NEXT_STRICT_MODE ? (
       <React.StrictMode>{elem}</React.StrictMode>
     ) : (
       elem
     ),
-    appElement
+    appElement!
   )
 
   await renderPromise
 }
 
-function Root({ callback, children }) {
+function Root({
+  callback,
+  children,
+}: React.PropsWithChildren<{
+  callback: () => void
+}>): React.ReactElement {
   // We use `useLayoutEffect` to guarantee the callback is executed
   // as soon as React flushes the update.
   React.useLayoutEffect(() => callback(), [callback])
-  return children
+  return children as React.ReactElement
 }
diff --git a/packages/next/client/link.tsx b/packages/next/client/link.tsx
index deef50d9abb3d..864edffa955c9 100644
--- a/packages/next/client/link.tsx
+++ b/packages/next/client/link.tsx
@@ -1,15 +1,21 @@
 import React, { Children } from 'react'
 import { UrlObject } from 'url'
 import {
-  PrefetchOptions,
-  NextRouter,
+  addBasePath,
   isLocalURL,
+  NextRouter,
+  PrefetchOptions,
+  resolveHref,
 } from '../next-server/lib/router/router'
-import { execOnce } from '../next-server/lib/utils'
 import { useRouter } from './router'
-import { addBasePath, resolveHref } from '../next-server/lib/router/router'
 
 type Url = string | UrlObject
+type RequiredKeys<T> = {
+  [K in keyof T]-?: {} extends Pick<T, K> ? never : K
+}[keyof T]
+type OptionalKeys<T> = {
+  [K in keyof T]-?: {} extends Pick<T, K> ? K : never
+}[keyof T]
 
 export type LinkProps = {
   href: Url
@@ -20,6 +26,8 @@ export type LinkProps = {
   passHref?: boolean
   prefetch?: boolean
 }
+type LinkPropsRequired = RequiredKeys<LinkProps>
+type LinkPropsOptional = OptionalKeys<LinkProps>
 
 let cachedObserver: IntersectionObserver
 const listeners = new Map<Element, () => void>()
@@ -146,6 +154,91 @@ function linkClicked(
 
 function Link(props: React.PropsWithChildren<LinkProps>) {
   if (process.env.NODE_ENV !== 'production') {
+    function createPropError(args: {
+      key: string
+      expected: string
+      actual: string
+    }) {
+      return new Error(
+        `Failed prop type: The prop \`${args.key}\` expects a ${args.expected} in \`<Link>\`, but got \`${args.actual}\` instead.` +
+          (typeof window !== 'undefined'
+            ? "\nOpen your browser's console to view the Component stack trace."
+            : '')
+      )
+    }
+
+    // TypeScript trick for type-guarding:
+    const requiredPropsGuard: Record<LinkPropsRequired, true> = {
+      href: true,
+    } as const
+    const requiredProps: LinkPropsRequired[] = Object.keys(
+      requiredPropsGuard
+    ) as LinkPropsRequired[]
+    requiredProps.forEach((key: LinkPropsRequired) => {
+      if (key === 'href') {
+        if (
+          props[key] == null ||
+          (typeof props[key] !== 'string' && typeof props[key] !== 'object')
+        ) {
+          throw createPropError({
+            key,
+            expected: '`string` or `object`',
+            actual: props[key] === null ? 'null' : typeof props[key],
+          })
+        }
+      } else {
+        // TypeScript trick for type-guarding:
+        // eslint-disable-next-line @typescript-eslint/no-unused-vars
+        const _: never = key
+      }
+    })
+
+    // TypeScript trick for type-guarding:
+    const optionalPropsGuard: Record<LinkPropsOptional, true> = {
+      as: true,
+      replace: true,
+      scroll: true,
+      shallow: true,
+      passHref: true,
+      prefetch: true,
+    } as const
+    const optionalProps: LinkPropsOptional[] = Object.keys(
+      optionalPropsGuard
+    ) as LinkPropsOptional[]
+    optionalProps.forEach((key: LinkPropsOptional) => {
+      if (key === 'as') {
+        if (
+          props[key] &&
+          typeof props[key] !== 'string' &&
+          typeof props[key] !== 'object'
+        ) {
+          throw createPropError({
+            key,
+            expected: '`string` or `object`',
+            actual: typeof props[key],
+          })
+        }
+      } else if (
+        key === 'replace' ||
+        key === 'scroll' ||
+        key === 'shallow' ||
+        key === 'passHref' ||
+        key === 'prefetch'
+      ) {
+        if (props[key] != null && typeof props[key] !== 'boolean') {
+          throw createPropError({
+            key,
+            expected: '`boolean`',
+            actual: typeof props[key],
+          })
+        }
+      } else {
+        // TypeScript trick for type-guarding:
+        // eslint-disable-next-line @typescript-eslint/no-unused-vars
+        const _: never = key
+      }
+    })
+
     // This hook is in a conditional but that is ok because `process.env.NODE_ENV` never changes
     // eslint-disable-next-line react-hooks/rules-of-hooks
     const hasWarned = React.useRef(false)
@@ -242,36 +335,4 @@ function Link(props: React.PropsWithChildren<LinkProps>) {
   return React.cloneElement(child, childProps)
 }
 
-if (process.env.NODE_ENV === 'development') {
-  const warn = execOnce(console.error)
-
-  // This module gets removed by webpack.IgnorePlugin
-  const PropTypes = require('prop-types')
-  const exact = require('prop-types-exact')
-  // @ts-ignore the property is supported, when declaring it on the class it outputs an extra bit of code which is not needed.
-  Link.propTypes = exact({
-    href: PropTypes.oneOfType([PropTypes.string, PropTypes.object]).isRequired,
-    as: PropTypes.oneOfType([PropTypes.string, PropTypes.object]),
-    prefetch: PropTypes.bool,
-    replace: PropTypes.bool,
-    shallow: PropTypes.bool,
-    passHref: PropTypes.bool,
-    scroll: PropTypes.bool,
-    children: PropTypes.oneOfType([
-      PropTypes.element,
-      (props: any, propName: string) => {
-        const value = props[propName]
-
-        if (typeof value === 'string') {
-          warn(
-            `Warning: You're using a string directly inside <Link>. This usage has been deprecated. Please add an <a> tag as child of <Link>`
-          )
-        }
-
-        return null
-      },
-    ]).isRequired,
-  })
-}
-
 export default Link
diff --git a/packages/next/client/next-dev.js b/packages/next/client/next-dev.js
index ba2d19e35f310..2475c984fd0ad 100644
--- a/packages/next/client/next-dev.js
+++ b/packages/next/client/next-dev.js
@@ -6,6 +6,7 @@ import initWebpackHMR from './dev/webpack-hot-middleware-client'
 import initializeBuildWatcher from './dev/dev-build-watcher'
 import initializePrerenderIndicator from './dev/prerender-indicator'
 import { displayContent } from './dev/fouc'
+import { getEventSourceWrapper } from './dev/error-overlay/eventsource'
 
 // Temporary workaround for the issue described here:
 // https://github.com/vercel/next.js/issues/3775#issuecomment-407438123
@@ -30,6 +31,22 @@ window.next = next
 initNext({ webpackHMR })
   .then(({ renderCtx, render }) => {
     initOnDemandEntries({ assetPrefix: prefix })
+
+    function devPagesManifestListener(event) {
+      if (event.data.indexOf('devPagesManifest') !== -1) {
+        fetch(`${prefix}/_next/static/development/_devPagesManifest.json`)
+          .then((res) => res.json())
+          .then((manifest) => {
+            window.__DEV_PAGES_MANIFEST = manifest
+          })
+          .catch((err) => {
+            console.log(`Failed to fetch devPagesManifest`, err)
+          })
+      }
+    }
+    devPagesManifestListener.unfiltered = true
+    getEventSourceWrapper({}).addMessageListener(devPagesManifestListener)
+
     if (process.env.__NEXT_BUILD_INDICATOR) initializeBuildWatcher()
     if (
       process.env.__NEXT_PRERENDER_INDICATOR &&
diff --git a/packages/next/client/page-loader.js b/packages/next/client/page-loader.js
deleted file mode 100644
index c8d3b1197d97a..0000000000000
--- a/packages/next/client/page-loader.js
+++ /dev/null
@@ -1,377 +0,0 @@
-import mitt from '../next-server/lib/mitt'
-import { addBasePath, markLoadingError } from '../next-server/lib/router/router'
-import escapePathDelimiters from '../next-server/lib/router/utils/escape-path-delimiters'
-import getAssetPathFromRoute from './../next-server/lib/router/utils/get-asset-path-from-route'
-import { isDynamicRoute } from './../next-server/lib/router/utils/is-dynamic'
-import { parseRelativeUrl } from './../next-server/lib/router/utils/parse-relative-url'
-import { searchParamsToUrlQuery } from './../next-server/lib/router/utils/querystring'
-import { getRouteMatcher } from './../next-server/lib/router/utils/route-matcher'
-import { getRouteRegex } from './../next-server/lib/router/utils/route-regex'
-
-function hasRel(rel, link) {
-  try {
-    link = document.createElement('link')
-    return link.relList.supports(rel)
-  } catch {}
-}
-
-function pageLoadError(route) {
-  return markLoadingError(new Error(`Error loading ${route}`))
-}
-
-const relPrefetch =
-  hasRel('preload') && !hasRel('prefetch')
-    ? // https://caniuse.com/#feat=link-rel-preload
-      // macOS and iOS (Safari does not support prefetch)
-      'preload'
-    : // https://caniuse.com/#feat=link-rel-prefetch
-      // IE 11, Edge 12+, nearly all evergreen
-      'prefetch'
-
-const hasNoModule = 'noModule' in document.createElement('script')
-
-const requestIdleCallback =
-  window.requestIdleCallback ||
-  function (cb) {
-    return setTimeout(cb, 1)
-  }
-
-/** @param {string} route */
-function normalizeRoute(route) {
-  if (route[0] !== '/') {
-    throw new Error(`Route name should start with a "/", got "${route}"`)
-  }
-
-  if (route === '/') return route
-  return route.replace(/\/$/, '')
-}
-
-function appendLink(href, rel, as) {
-  return new Promise((res, rej, link) => {
-    link = document.createElement('link')
-    link.crossOrigin = process.env.__NEXT_CROSS_ORIGIN
-    link.href = href
-    link.rel = rel
-    if (as) link.as = as
-
-    link.onload = res
-    link.onerror = rej
-
-    document.head.appendChild(link)
-  })
-}
-
-export default class PageLoader {
-  constructor(buildId, assetPrefix, initialPage) {
-    this.buildId = buildId
-    this.assetPrefix = assetPrefix
-
-    this.pageCache = {}
-    this.pageRegisterEvents = mitt()
-    this.loadingRoutes = {
-      // By default these 2 pages are being loaded in the initial html
-      '/_app': true,
-    }
-
-    // TODO: get rid of this limitation for rendering the error page
-    if (initialPage !== '/_error') {
-      this.loadingRoutes[initialPage] = true
-    }
-
-    if (process.env.NODE_ENV === 'production') {
-      this.promisedBuildManifest = new Promise((resolve) => {
-        if (window.__BUILD_MANIFEST) {
-          resolve(window.__BUILD_MANIFEST)
-        } else {
-          window.__BUILD_MANIFEST_CB = () => {
-            resolve(window.__BUILD_MANIFEST)
-          }
-        }
-      })
-    }
-    /** @type {Promise<Set<string>>} */
-    this.promisedSsgManifest = new Promise((resolve) => {
-      if (window.__SSG_MANIFEST) {
-        resolve(window.__SSG_MANIFEST)
-      } else {
-        window.__SSG_MANIFEST_CB = () => {
-          resolve(window.__SSG_MANIFEST)
-        }
-      }
-    })
-  }
-
-  // Returns a promise for the dependencies for a particular route
-  getDependencies(route) {
-    return this.promisedBuildManifest.then((m) => {
-      return m[route]
-        ? m[route].map((url) => `${this.assetPrefix}/_next/${encodeURI(url)}`)
-        : this.pageRegisterEvents.emit(route, {
-            error: pageLoadError(route),
-          }) ?? []
-    })
-  }
-
-  /**
-   * @param {string} href the route href (file-system path)
-   * @param {string} asPath the URL as shown in browser (virtual path); used for dynamic routes
-   */
-  getDataHref(href, asPath, ssg) {
-    const { pathname: hrefPathname, searchParams, search } = parseRelativeUrl(
-      href
-    )
-    const query = searchParamsToUrlQuery(searchParams)
-    const { pathname: asPathname } = parseRelativeUrl(asPath)
-    const route = normalizeRoute(hrefPathname)
-
-    const getHrefForSlug = (/** @type string */ path) => {
-      const dataRoute = getAssetPathFromRoute(path, '.json')
-      return addBasePath(
-        `/_next/data/${this.buildId}${dataRoute}${ssg ? '' : search}`
-      )
-    }
-
-    let isDynamic = isDynamicRoute(route),
-      interpolatedRoute
-    if (isDynamic) {
-      const dynamicRegex = getRouteRegex(route)
-      const dynamicGroups = dynamicRegex.groups
-      const dynamicMatches =
-        // Try to match the dynamic route against the asPath
-        getRouteMatcher(dynamicRegex)(asPathname) ||
-        // Fall back to reading the values from the href
-        // TODO: should this take priority; also need to change in the router.
-        query
-
-      interpolatedRoute = route
-      if (
-        !Object.keys(dynamicGroups).every((param) => {
-          let value = dynamicMatches[param] || ''
-          const { repeat, optional } = dynamicGroups[param]
-
-          // support single-level catch-all
-          // TODO: more robust handling for user-error (passing `/`)
-          let replaced = `[${repeat ? '...' : ''}${param}]`
-          if (optional) {
-            replaced = `${!value ? '/' : ''}[${replaced}]`
-          }
-          if (repeat && !Array.isArray(value)) value = [value]
-
-          return (
-            (optional || param in dynamicMatches) &&
-            // Interpolate group into data URL if present
-            (interpolatedRoute =
-              interpolatedRoute.replace(
-                replaced,
-                repeat
-                  ? value.map(escapePathDelimiters).join('/')
-                  : escapePathDelimiters(value)
-              ) || '/')
-          )
-        })
-      ) {
-        interpolatedRoute = '' // did not satisfy all requirements
-
-        // n.b. We ignore this error because we handle warning for this case in
-        // development in the `<Link>` component directly.
-      }
-    }
-
-    return isDynamic
-      ? interpolatedRoute && getHrefForSlug(interpolatedRoute)
-      : getHrefForSlug(route)
-  }
-
-  /**
-   * @param {string} href the route href (file-system path)
-   * @param {string} asPath the URL as shown in browser (virtual path); used for dynamic routes
-   */
-  prefetchData(href, asPath) {
-    const { pathname: hrefPathname } = parseRelativeUrl(href)
-    const route = normalizeRoute(hrefPathname)
-    return this.promisedSsgManifest.then((s, _dataHref) => {
-      requestIdleCallback(() => {
-        // Check if the route requires a data file
-        s.has(route) &&
-          // Try to generate data href, noop when falsy
-          (_dataHref = this.getDataHref(href, asPath, true)) &&
-          // noop when data has already been prefetched (dedupe)
-          !document.querySelector(
-            `link[rel="${relPrefetch}"][href^="${_dataHref}"]`
-          ) &&
-          // Inject the `<link rel=prefetch>` tag for above computed `href`.
-          appendLink(_dataHref, relPrefetch, 'fetch')
-      })
-    })
-  }
-
-  loadPage(route) {
-    route = normalizeRoute(route)
-
-    return new Promise((resolve, reject) => {
-      // If there's a cached version of the page, let's use it.
-      const cachedPage = this.pageCache[route]
-      if (cachedPage) {
-        const { error, page, mod } = cachedPage
-        error ? reject(error) : resolve({ page, mod })
-        return
-      }
-
-      const fire = ({ error, page, mod }) => {
-        this.pageRegisterEvents.off(route, fire)
-        delete this.loadingRoutes[route]
-
-        if (error) {
-          reject(error)
-        } else {
-          resolve({ page, mod })
-        }
-      }
-
-      // Register a listener to get the page
-      this.pageRegisterEvents.on(route, fire)
-
-      if (!this.loadingRoutes[route]) {
-        this.loadingRoutes[route] = true
-        if (process.env.NODE_ENV === 'production') {
-          this.getDependencies(route).then((deps) => {
-            deps.forEach((d) => {
-              if (
-                d.endsWith('.js') &&
-                !document.querySelector(`script[src^="${d}"]`)
-              ) {
-                this.loadScript(d, route)
-              }
-              if (
-                d.endsWith('.css') &&
-                !document.querySelector(`link[rel=stylesheet][href^="${d}"]`)
-              ) {
-                appendLink(d, 'stylesheet').catch(() => {
-                  // FIXME: handle failure
-                  // Right now, this is needed to prevent an unhandled rejection.
-                })
-              }
-            })
-          })
-        } else {
-          // Development only. In production the page file is part of the build manifest
-          route = normalizeRoute(route)
-          let scriptRoute = getAssetPathFromRoute(route, '.js')
-
-          const url = `${this.assetPrefix}/_next/static/chunks/pages${encodeURI(
-            scriptRoute
-          )}`
-          this.loadScript(url, route)
-        }
-      }
-    })
-  }
-
-  loadScript(url, route) {
-    const script = document.createElement('script')
-    if (process.env.__NEXT_MODERN_BUILD && hasNoModule) {
-      script.type = 'module'
-    }
-    script.crossOrigin = process.env.__NEXT_CROSS_ORIGIN
-    script.src = url
-    script.onerror = () => {
-      this.pageRegisterEvents.emit(route, { error: pageLoadError(url) })
-    }
-    document.body.appendChild(script)
-  }
-
-  // This method if called by the route code.
-  registerPage(route, regFn) {
-    const register = () => {
-      try {
-        const mod = regFn()
-        const pageData = { page: mod.default || mod, mod }
-        this.pageCache[route] = pageData
-        this.pageRegisterEvents.emit(route, pageData)
-      } catch (error) {
-        this.pageCache[route] = { error }
-        this.pageRegisterEvents.emit(route, { error })
-      }
-    }
-
-    if (process.env.NODE_ENV !== 'production') {
-      // Wait for webpack to become idle if it's not.
-      // More info: https://github.com/vercel/next.js/pull/1511
-      if (module.hot && module.hot.status() !== 'idle') {
-        console.log(
-          `Waiting for webpack to become "idle" to initialize the page: "${route}"`
-        )
-
-        const check = (status) => {
-          if (status === 'idle') {
-            module.hot.removeStatusHandler(check)
-            register()
-          }
-        }
-        module.hot.status(check)
-        return
-      }
-    }
-
-    register()
-  }
-
-  /**
-   * @param {string} route
-   * @param {boolean} [isDependency]
-   */
-  prefetch(route, isDependency) {
-    // https://github.com/GoogleChromeLabs/quicklink/blob/453a661fa1fa940e2d2e044452398e38c67a98fb/src/index.mjs#L115-L118
-    // License: Apache 2.0
-    let cn
-    if ((cn = navigator.connection)) {
-      // Don't prefetch if using 2G or if Save-Data is enabled.
-      if (cn.saveData || /2g/.test(cn.effectiveType)) return Promise.resolve()
-    }
-
-    /** @type {string} */
-    let url
-    if (isDependency) {
-      url = route
-    } else {
-      if (process.env.NODE_ENV !== 'production') {
-        route = normalizeRoute(route)
-
-        const ext =
-          process.env.__NEXT_MODERN_BUILD && hasNoModule ? '.module.js' : '.js'
-        const scriptRoute = getAssetPathFromRoute(route, ext)
-
-        url = `${this.assetPrefix}/_next/static/${encodeURIComponent(
-          this.buildId
-        )}/pages${encodeURI(scriptRoute)}`
-      }
-    }
-
-    return Promise.all(
-      document.querySelector(`link[rel="${relPrefetch}"][href^="${url}"]`)
-        ? []
-        : [
-            url &&
-              appendLink(
-                url,
-                relPrefetch,
-                url.endsWith('.css') ? 'style' : 'script'
-              ),
-            process.env.NODE_ENV === 'production' &&
-              !isDependency &&
-              this.getDependencies(route).then((urls) =>
-                Promise.all(
-                  urls.map((dependencyUrl) =>
-                    this.prefetch(dependencyUrl, true)
-                  )
-                )
-              ),
-          ]
-    ).then(
-      // do not return any data
-      () => {},
-      // swallow prefetch errors
-      () => {}
-    )
-  }
-}
diff --git a/packages/next/client/page-loader.ts b/packages/next/client/page-loader.ts
new file mode 100644
index 0000000000000..a2be22aa68016
--- /dev/null
+++ b/packages/next/client/page-loader.ts
@@ -0,0 +1,500 @@
+import { ComponentType } from 'react'
+import type { ClientSsgManifest } from '../build'
+import type { ClientBuildManifest } from '../build/webpack/plugins/build-manifest-plugin'
+import mitt from '../next-server/lib/mitt'
+import type { MittEmitter } from '../next-server/lib/mitt'
+import { addBasePath, markLoadingError } from '../next-server/lib/router/router'
+import escapePathDelimiters from '../next-server/lib/router/utils/escape-path-delimiters'
+import getAssetPathFromRoute from '../next-server/lib/router/utils/get-asset-path-from-route'
+import { isDynamicRoute } from '../next-server/lib/router/utils/is-dynamic'
+import { parseRelativeUrl } from '../next-server/lib/router/utils/parse-relative-url'
+import { searchParamsToUrlQuery } from '../next-server/lib/router/utils/querystring'
+import { getRouteMatcher } from '../next-server/lib/router/utils/route-matcher'
+import { getRouteRegex } from '../next-server/lib/router/utils/route-regex'
+
+function hasRel(rel: string, link?: HTMLLinkElement) {
+  try {
+    link = document.createElement('link')
+    return link.relList.supports(rel)
+  } catch {}
+}
+
+function pageLoadError(route: string) {
+  return markLoadingError(new Error(`Error loading ${route}`))
+}
+
+const relPrefetch =
+  hasRel('preload') && !hasRel('prefetch')
+    ? // https://caniuse.com/#feat=link-rel-preload
+      // macOS and iOS (Safari does not support prefetch)
+      'preload'
+    : // https://caniuse.com/#feat=link-rel-prefetch
+      // IE 11, Edge 12+, nearly all evergreen
+      'prefetch'
+
+const relPreload = hasRel('preload') ? 'preload' : relPrefetch
+
+const hasNoModule = 'noModule' in document.createElement('script')
+
+const requestIdleCallback: (fn: () => void) => void =
+  (window as any).requestIdleCallback ||
+  function (cb: () => void) {
+    return setTimeout(cb, 1)
+  }
+
+function normalizeRoute(route: string) {
+  if (route[0] !== '/') {
+    throw new Error(`Route name should start with a "/", got "${route}"`)
+  }
+
+  if (route === '/') return route
+  return route.replace(/\/$/, '')
+}
+
+export function createLink(
+  href: string,
+  rel: string,
+  as?: string,
+  link?: HTMLLinkElement
+): [HTMLLinkElement, Promise<any>] {
+  link = document.createElement('link')
+  return [
+    link,
+    new Promise((res, rej) => {
+      // The order of property assignment here is intentional:
+      if (as) link!.as = as
+      link!.rel = rel
+      link!.crossOrigin = process.env.__NEXT_CROSS_ORIGIN!
+      link!.onload = res
+      link!.onerror = rej
+
+      // `href` should always be last:
+      link!.href = href
+    }),
+  ]
+}
+
+function appendLink(href: string, rel: string, as?: string): Promise<any> {
+  const [link, res] = createLink(href, rel, as)
+  document.head.appendChild(link)
+  return res
+}
+
+function loadScript(url: string): Promise<any> {
+  return new Promise((res, rej) => {
+    const script = document.createElement('script')
+    if (process.env.__NEXT_MODERN_BUILD && hasNoModule) {
+      script.type = 'module'
+    }
+    script.crossOrigin = process.env.__NEXT_CROSS_ORIGIN!
+    script.src = url
+    script.onload = res
+    script.onerror = () => rej(pageLoadError(url))
+    document.body.appendChild(script)
+  })
+}
+
+export type GoodPageCache = {
+  page: ComponentType
+  mod: any
+  styleSheets: string[]
+}
+export type PageCacheEntry = { error: any } | GoodPageCache
+
+export default class PageLoader {
+  private initialPage: string
+  private initialStyleSheets: string[]
+  private buildId: string
+  private assetPrefix: string
+  private pageCache: Record<string, PageCacheEntry>
+  private pageRegisterEvents: MittEmitter
+  private loadingRoutes: Record<string, boolean>
+  private promisedBuildManifest?: Promise<ClientBuildManifest>
+  private promisedSsgManifest?: Promise<ClientSsgManifest>
+  private promisedDevPagesManifest?: Promise<any>
+
+  constructor(
+    buildId: string,
+    assetPrefix: string,
+    initialPage: string,
+    initialStyleSheets: string[]
+  ) {
+    this.initialPage = initialPage
+    this.initialStyleSheets = initialStyleSheets
+
+    this.buildId = buildId
+    this.assetPrefix = assetPrefix
+
+    this.pageCache = {}
+    this.pageRegisterEvents = mitt()
+    this.loadingRoutes = {
+      // By default these 2 pages are being loaded in the initial html
+      '/_app': true,
+    }
+
+    // TODO: get rid of this limitation for rendering the error page
+    if (initialPage !== '/_error') {
+      this.loadingRoutes[initialPage] = true
+    }
+
+    this.promisedBuildManifest = new Promise((resolve) => {
+      if ((window as any).__BUILD_MANIFEST) {
+        resolve((window as any).__BUILD_MANIFEST)
+      } else {
+        ;(window as any).__BUILD_MANIFEST_CB = () => {
+          resolve((window as any).__BUILD_MANIFEST)
+        }
+      }
+    })
+
+    /** @type {Promise<Set<string>>} */
+    this.promisedSsgManifest = new Promise((resolve) => {
+      if ((window as any).__SSG_MANIFEST) {
+        resolve((window as any).__SSG_MANIFEST)
+      } else {
+        ;(window as any).__SSG_MANIFEST_CB = () => {
+          resolve((window as any).__SSG_MANIFEST)
+        }
+      }
+    })
+  }
+
+  getPageList() {
+    if (process.env.NODE_ENV === 'production') {
+      return this.promisedBuildManifest!.then(
+        (buildManifest) => buildManifest.sortedPages
+      )
+    } else {
+      if ((window as any).__DEV_PAGES_MANIFEST) {
+        return (window as any).__DEV_PAGES_MANIFEST.pages
+      } else {
+        if (!this.promisedDevPagesManifest) {
+          this.promisedDevPagesManifest = fetch(
+            `${this.assetPrefix}/_next/static/development/_devPagesManifest.json`
+          )
+            .then((res) => res.json())
+            .then((manifest) => {
+              ;(window as any).__DEV_PAGES_MANIFEST = manifest
+              return manifest.pages
+            })
+            .catch((err) => {
+              console.log(`Failed to fetch devPagesManifest`, err)
+            })
+        }
+        return this.promisedDevPagesManifest
+      }
+    }
+  }
+
+  // Returns a promise for the dependencies for a particular route
+  private getDependencies(route: string): Promise<string[]> {
+    return this.promisedBuildManifest!.then((m) => {
+      return m[route]
+        ? m[route].map((url) => `${this.assetPrefix}/_next/${encodeURI(url)}`)
+        : Promise.reject(pageLoadError(route))
+    })
+  }
+
+  /**
+   * @param {string} href the route href (file-system path)
+   * @param {string} asPath the URL as shown in browser (virtual path); used for dynamic routes
+   */
+  getDataHref(href: string, asPath: string, ssg: boolean) {
+    const { pathname: hrefPathname, searchParams, search } = parseRelativeUrl(
+      href
+    )
+    const query = searchParamsToUrlQuery(searchParams)
+    const { pathname: asPathname } = parseRelativeUrl(asPath)
+    const route = normalizeRoute(hrefPathname)
+
+    const getHrefForSlug = (path: string) => {
+      const dataRoute = getAssetPathFromRoute(path, '.json')
+      return addBasePath(
+        `/_next/data/${this.buildId}${dataRoute}${ssg ? '' : search}`
+      )
+    }
+
+    let isDynamic: boolean = isDynamicRoute(route),
+      interpolatedRoute: string | undefined
+    if (isDynamic) {
+      const dynamicRegex = getRouteRegex(route)
+      const dynamicGroups = dynamicRegex.groups
+      const dynamicMatches =
+        // Try to match the dynamic route against the asPath
+        getRouteMatcher(dynamicRegex)(asPathname) ||
+        // Fall back to reading the values from the href
+        // TODO: should this take priority; also need to change in the router.
+        query
+
+      interpolatedRoute = route
+      if (
+        !Object.keys(dynamicGroups).every((param) => {
+          let value = dynamicMatches[param] || ''
+          const { repeat, optional } = dynamicGroups[param]
+
+          // support single-level catch-all
+          // TODO: more robust handling for user-error (passing `/`)
+          let replaced = `[${repeat ? '...' : ''}${param}]`
+          if (optional) {
+            replaced = `${!value ? '/' : ''}[${replaced}]`
+          }
+          if (repeat && !Array.isArray(value)) value = [value]
+
+          return (
+            (optional || param in dynamicMatches) &&
+            // Interpolate group into data URL if present
+            (interpolatedRoute =
+              interpolatedRoute!.replace(
+                replaced,
+                repeat
+                  ? (value as string[]).map(escapePathDelimiters).join('/')
+                  : escapePathDelimiters(value as string)
+              ) || '/')
+          )
+        })
+      ) {
+        interpolatedRoute = '' // did not satisfy all requirements
+
+        // n.b. We ignore this error because we handle warning for this case in
+        // development in the `<Link>` component directly.
+      }
+    }
+
+    return isDynamic
+      ? interpolatedRoute && getHrefForSlug(interpolatedRoute)
+      : getHrefForSlug(route)
+  }
+
+  /**
+   * @param {string} href the route href (file-system path)
+   * @param {string} asPath the URL as shown in browser (virtual path); used for dynamic routes
+   */
+  prefetchData(href: string, asPath: string) {
+    const { pathname: hrefPathname } = parseRelativeUrl(href)
+    const route = normalizeRoute(hrefPathname)
+    return this.promisedSsgManifest!.then(
+      (s: ClientSsgManifest, _dataHref?: string) => {
+        requestIdleCallback(() => {
+          // Check if the route requires a data file
+          s.has(route) &&
+            // Try to generate data href, noop when falsy
+            (_dataHref = this.getDataHref(href, asPath, true)) &&
+            // noop when data has already been prefetched (dedupe)
+            !document.querySelector(
+              `link[rel="${relPrefetch}"][href^="${_dataHref}"]`
+            ) &&
+            // Inject the `<link rel=prefetch>` tag for above computed `href`.
+            appendLink(_dataHref, relPrefetch, 'fetch')
+        })
+      }
+    )
+  }
+
+  loadPage(route: string): Promise<GoodPageCache> {
+    route = normalizeRoute(route)
+
+    return new Promise<GoodPageCache>((resolve, reject) => {
+      // If there's a cached version of the page, let's use it.
+      const cachedPage = this.pageCache[route]
+      if (cachedPage) {
+        if ('error' in cachedPage) {
+          reject(cachedPage.error)
+        } else {
+          resolve(cachedPage)
+        }
+        return
+      }
+
+      const fire = (pageToCache: PageCacheEntry) => {
+        this.pageRegisterEvents.off(route, fire)
+        delete this.loadingRoutes[route]
+
+        if ('error' in pageToCache) {
+          reject(pageToCache.error)
+        } else {
+          resolve(pageToCache)
+        }
+      }
+
+      // Register a listener to get the page
+      this.pageRegisterEvents.on(route, fire)
+
+      if (!this.loadingRoutes[route]) {
+        this.loadingRoutes[route] = true
+        if (process.env.NODE_ENV === 'production') {
+          this.getDependencies(route)
+            .then((deps) => {
+              const pending: Promise<any>[] = []
+              deps.forEach((d) => {
+                if (
+                  d.endsWith('.js') &&
+                  !document.querySelector(`script[src^="${d}"]`)
+                ) {
+                  pending.push(loadScript(d))
+                }
+
+                // Prefetch CSS as it'll be needed when the page JavaScript
+                // evaluates. This will only trigger if explicit prefetching is
+                // disabled for a <Link>... prefetching in this case is desirable
+                // because we *know* it's going to be used very soon (page was
+                // loaded).
+                if (
+                  d.endsWith('.css') &&
+                  !document.querySelector(
+                    `link[rel="${relPreload}"][href^="${d}"]`
+                  )
+                ) {
+                  // This is not pushed into `pending` because we don't need to
+                  // wait for these to resolve. To prevent an unhandled
+                  // rejection, we swallow the error which is handled later in
+                  // the rendering cycle (this is just a preload optimization).
+                  appendLink(d, relPreload, 'style').catch(() => {
+                    /* ignore preload error */
+                  })
+                }
+              })
+              return Promise.all(pending)
+            })
+            .catch((err) => {
+              // Mark the page as failed to load if any of its required scripts
+              // fail to load:
+              this.pageCache[route] = { error: err }
+              fire({ error: err })
+            })
+        } else {
+          // Development only. In production the page file is part of the build manifest
+          route = normalizeRoute(route)
+          let scriptRoute = getAssetPathFromRoute(route, '.js')
+
+          const url = `${this.assetPrefix}/_next/static/chunks/pages${encodeURI(
+            scriptRoute
+          )}`
+          loadScript(url).catch((err) => {
+            // Mark the page as failed to load if its script fails to load:
+            this.pageCache[route] = { error: err }
+            fire({ error: err })
+          })
+        }
+      }
+    })
+  }
+
+  // This method if called by the route code.
+  registerPage(route: string, regFn: () => any) {
+    const register = (styleSheets: string[]) => {
+      try {
+        const mod = regFn()
+        const pageData: PageCacheEntry = {
+          page: mod.default || mod,
+          mod,
+          styleSheets,
+        }
+        this.pageCache[route] = pageData
+        this.pageRegisterEvents.emit(route, pageData)
+      } catch (error) {
+        this.pageCache[route] = { error }
+        this.pageRegisterEvents.emit(route, { error })
+      }
+    }
+
+    if (process.env.NODE_ENV !== 'production') {
+      // Wait for webpack to become idle if it's not.
+      // More info: https://github.com/vercel/next.js/pull/1511
+      if ((module as any).hot && (module as any).hot.status() !== 'idle') {
+        console.log(
+          `Waiting for webpack to become "idle" to initialize the page: "${route}"`
+        )
+
+        const check = (status: string) => {
+          if (status === 'idle') {
+            ;(module as any).hot.removeStatusHandler(check)
+            register(
+              /* css is handled via style-loader in development */
+              []
+            )
+          }
+        }
+        ;(module as any).hot.status(check)
+        return
+      }
+    }
+
+    const promisedDeps: Promise<string[]> =
+      // Shared styles will already be on the page:
+      route === '/_app' ||
+      // We use `style-loader` in development:
+      process.env.NODE_ENV !== 'production'
+        ? Promise.resolve([])
+        : route === this.initialPage
+        ? Promise.resolve(this.initialStyleSheets)
+        : // Tests that this does not block hydration:
+          // test/integration/css-fixtures/hydrate-without-deps/
+          this.getDependencies(route)
+    promisedDeps.then(
+      (deps) => register(deps.filter((d) => d.endsWith('.css'))),
+      (error) => {
+        this.pageCache[route] = { error }
+        this.pageRegisterEvents.emit(route, { error })
+      }
+    )
+  }
+
+  /**
+   * @param {string} route
+   * @param {boolean} [isDependency]
+   */
+  prefetch(route: string, isDependency?: boolean): Promise<void> {
+    // https://github.com/GoogleChromeLabs/quicklink/blob/453a661fa1fa940e2d2e044452398e38c67a98fb/src/index.mjs#L115-L118
+    // License: Apache 2.0
+    let cn
+    if ((cn = (navigator as any).connection)) {
+      // Don't prefetch if using 2G or if Save-Data is enabled.
+      if (cn.saveData || /2g/.test(cn.effectiveType)) return Promise.resolve()
+    }
+
+    /** @type {string} */
+    let url
+    if (isDependency) {
+      url = route
+    } else {
+      if (process.env.NODE_ENV !== 'production') {
+        route = normalizeRoute(route)
+
+        const ext =
+          process.env.__NEXT_MODERN_BUILD && hasNoModule ? '.module.js' : '.js'
+        const scriptRoute = getAssetPathFromRoute(route, ext)
+
+        url = `${this.assetPrefix}/_next/static/${encodeURIComponent(
+          this.buildId
+        )}/pages${encodeURI(scriptRoute)}`
+      }
+    }
+
+    return Promise.all(
+      document.querySelector(`link[rel="${relPrefetch}"][href^="${url}"]`)
+        ? []
+        : [
+            url &&
+              appendLink(
+                url,
+                relPrefetch,
+                url.endsWith('.css') ? 'style' : 'script'
+              ),
+            process.env.NODE_ENV === 'production' &&
+              !isDependency &&
+              this.getDependencies(route).then((urls) =>
+                Promise.all(
+                  urls.map((dependencyUrl) =>
+                    this.prefetch(dependencyUrl, true)
+                  )
+                )
+              ),
+          ]
+    ).then(
+      // do not return any data
+      () => {},
+      // swallow prefetch errors
+      () => {}
+    )
+  }
+}
diff --git a/packages/next/client/performance-relayer.js b/packages/next/client/performance-relayer.js
deleted file mode 100644
index 54907031f2aa0..0000000000000
--- a/packages/next/client/performance-relayer.js
+++ /dev/null
@@ -1,9 +0,0 @@
-import { getCLS, getFID, getFCP, getLCP, getTTFB } from 'web-vitals'
-
-export default (onPerfEntry) => {
-  getCLS(onPerfEntry)
-  getFID(onPerfEntry)
-  getFCP(onPerfEntry)
-  getLCP(onPerfEntry)
-  getTTFB(onPerfEntry)
-}
diff --git a/packages/next/client/performance-relayer.ts b/packages/next/client/performance-relayer.ts
new file mode 100644
index 0000000000000..f1b43fa7e10e7
--- /dev/null
+++ b/packages/next/client/performance-relayer.ts
@@ -0,0 +1,16 @@
+import {
+  getCLS,
+  getFCP,
+  getFID,
+  getLCP,
+  getTTFB,
+  ReportHandler,
+} from 'web-vitals'
+
+export default (onPerfEntry: ReportHandler) => {
+  getCLS(onPerfEntry)
+  getFID(onPerfEntry)
+  getFCP(onPerfEntry)
+  getLCP(onPerfEntry)
+  getTTFB(onPerfEntry)
+}
diff --git a/packages/next/client/router.ts b/packages/next/client/router.ts
index 1aab746062740..81f10d960936f 100644
--- a/packages/next/client/router.ts
+++ b/packages/next/client/router.ts
@@ -94,9 +94,7 @@ routerEvents.forEach((event) => {
         try {
           _singletonRouter[eventField](...args)
         } catch (err) {
-          // tslint:disable-next-line:no-console
           console.error(`Error when running the Router event: ${eventField}`)
-          // tslint:disable-next-line:no-console
           console.error(`${err.message}\n${err.stack}`)
         }
       }
diff --git a/packages/next/compiled/launch-editor/index.js b/packages/next/compiled/launch-editor/index.js
deleted file mode 100644
index 83b7bbd4aba64..0000000000000
--- a/packages/next/compiled/launch-editor/index.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports=function(e,n){"use strict";var t={};function __webpack_require__(n){if(t[n]){return t[n].exports}var r=t[n]={i:n,l:false,exports:{}};e[n].call(r.exports,r,r.exports,__webpack_require__);r.l=true;return r.exports}__webpack_require__.ab=__dirname+"/";function startup(){return __webpack_require__(231)}return startup()}({87:function(e){e.exports=require("os")},91:function(e){e.exports={atom:"atom",Brackets:"brackets",code:"code",emacs:"emacs","idea.sh":"idea","phpstorm.sh":"phpstorm","pycharm.sh":"pycharm","rubymine.sh":"rubymine",sublime_text:"subl",vim:"vim","webstorm.sh":"webstorm"}},129:function(e){e.exports=require("child_process")},231:function(e,n,t){const r=t(747);const a=t(87);const p=t(622);const i=t(736);const s=t(129);const o=t(470);const l=t(514);function wrapErrorCallback(e){return(n,t)=>{console.log();console.log(i.red("Could not open "+p.basename(n)+" in the editor."));if(t){if(t[t.length-1]!=="."){t+="."}console.log(i.red("The editor process exited with an error: "+t))}console.log();if(e)e(n,t)}}function isTerminalEditor(e){switch(e){case"vim":case"emacs":case"nano":return true}return false}const c=/:(\d+)(:(\d+))?$/;function parseFile(e){const n=e.replace(c,"");const t=e.match(c);const r=t&&t[1];const a=t&&t[3];return{fileName:n,lineNumber:r,columnNumber:a}}let f=null;function launchEditor(e,n,t){const i=parseFile(e);let{fileName:c}=i;const{lineNumber:m,columnNumber:b}=i;if(!r.existsSync(c)){return}if(typeof n==="function"){t=n;n=undefined}t=wrapErrorCallback(t);const[u,...x]=o(n);if(!u){t(c,null);return}if(process.platform==="linux"&&c.startsWith("/mnt/")&&/Microsoft/i.test(a.release())){c=p.relative("",c)}if(m){const e=l(u,c,m,b);x.push.apply(x,e)}else{x.push(c)}if(f&&isTerminalEditor(u)){f.kill("SIGKILL")}if(process.platform==="win32"){f=s.spawn("cmd.exe",["/C",u].concat(x),{stdio:"inherit"})}else{f=s.spawn(u,x,{stdio:"inherit"})}f.on("exit",function(e){f=null;if(e){t(c,"(code "+e+")")}});f.on("error",function(e){t(c,e.message)})}e.exports=launchEditor},313:function(e,n){n.quote=function(e){return e.map(function(e){if(e&&typeof e==="object"){return e.op.replace(/(.)/g,"\\$1")}else if(/["\s]/.test(e)&&!/'/.test(e)){return"'"+e.replace(/(['\\])/g,"\\$1")+"'"}else if(/["'\s]/.test(e)){return'"'+e.replace(/(["\\$`!])/g,"\\$1")+'"'}else{return String(e).replace(/([A-z]:)?([#!"$&'()*,:;<=>?@\[\\\]^`{|}])/g,"$1\\$2")}}).join(" ")};var t="(?:"+["\\|\\|","\\&\\&",";;","\\|\\&","\\<\\(",">>",">\\&","[&;()|<>]"].join("|")+")";var r="|&;()<> \\t";var a="(\\\\['\""+r+"]|[^\\s'\""+r+"])+";var p='"((\\\\"|[^"])*?)"';var i="'((\\\\'|[^'])*?)'";var s="";for(var o=0;o<4;o++){s+=(Math.pow(16,8)*Math.random()).toString(16)}n.parse=function(e,n,t){var r=parse(e,n,t);if(typeof n!=="function")return r;return r.reduce(function(e,n){if(typeof n==="object")return e.concat(n);var t=n.split(RegExp("("+s+".*?"+s+")","g"));if(t.length===1)return e.concat(t[0]);return e.concat(t.filter(Boolean).map(function(e){if(RegExp("^"+s).test(e)){return JSON.parse(e.split(s)[1])}else return e}))},[])};function parse(e,n,r){var o=new RegExp(["("+t+")","("+a+"|"+p+"|"+i+")*"].join("|"),"g");var l=e.match(o).filter(Boolean);var c=false;if(!l)return[];if(!n)n={};if(!r)r={};return l.map(function(e,n){if(c){return}if(RegExp("^"+t+"$").test(e)){return{op:e}}var a="'";var p='"';var i="$";var s=r.escape||"\\";var o=false;var f=false;var m="";var b=false;for(var u=0,x=e.length;u<x;u++){var d=e.charAt(u);b=b||!o&&(d==="*"||d==="?");if(f){m+=d;f=false}else if(o){if(d===o){o=false}else if(o==a){m+=d}else{if(d===s){u+=1;d=e.charAt(u);if(d===p||d===s||d===i){m+=d}else{m+=s+d}}else if(d===i){m+=parseEnvVar()}else{m+=d}}}else if(d===p||d===a){o=d}else if(RegExp("^"+t+"$").test(d)){return{op:e}}else if(RegExp("^#$").test(d)){c=true;if(m.length){return[m,{comment:e.slice(u+1)+l.slice(n+1).join(" ")}]}return[{comment:e.slice(u+1)+l.slice(n+1).join(" ")}]}else if(d===s){f=true}else if(d===i){m+=parseEnvVar()}else m+=d}if(b)return{op:"glob",pattern:m};return m;function parseEnvVar(){u+=1;var n,t;if(e.charAt(u)==="{"){u+=1;if(e.charAt(u)==="}"){throw new Error("Bad substitution: "+e.substr(u-2,3))}n=e.indexOf("}",u);if(n<0){throw new Error("Bad substitution: "+e.substr(u))}t=e.substr(u,n-u);u=n}else if(/[*@#?$!_\-]/.test(e.charAt(u))){t=e.charAt(u);u+=1}else{n=e.substr(u).match(/[^\w\d_]/);if(!n){t=e.substr(u);u=e.length}else{t=e.substr(u,n.index);u+=n.index-1}}return getVar(null,"",t)}}).reduce(function(e,n){if(n===undefined){return e}return e.concat(n)},[]);function getVar(e,t,r){var a=typeof n==="function"?n(r):n[r];if(a===undefined&&r!="")a="";else if(a===undefined)a="$";if(typeof a==="object"){return t+s+JSON.stringify(a)+s}else return t+a}}},373:function(e){e.exports=["Brackets.exe","Code.exe","atom.exe","sublime_text.exe","notepad++.exe","clion.exe","clion64.exe","idea.exe","idea64.exe","phpstorm.exe","phpstorm64.exe","pycharm.exe","pycharm64.exe","rubymine.exe","rubymine64.exe","webstorm.exe","webstorm64.exe"]},470:function(e,n,t){const r=t(622);const a=t(313);const p=t(129);const i=t(788);const s=t(91);const o=t(373);e.exports=function guessEditor(e){if(e){return a.parse(e)}try{if(process.platform==="darwin"){const e=p.execSync("ps x").toString();const n=Object.keys(i);for(let t=0;t<n.length;t++){const r=n[t];if(e.indexOf(r)!==-1){return[i[r]]}}}else if(process.platform==="win32"){const e=p.execSync('powershell -Command "Get-Process | Select-Object Path"',{stdio:["pipe","pipe","ignore"]}).toString();const n=e.split("\r\n");for(let e=0;e<n.length;e++){if(!n[e]){continue}const t=n[e].trim();const a=r.basename(t);if(o.indexOf(a)!==-1){return[t]}}}else if(process.platform==="linux"){const e=p.execSync("ps x --no-heading -o comm --sort=comm").toString();const n=Object.keys(s);for(let t=0;t<n.length;t++){const r=n[t];if(e.indexOf(r)!==-1){return[s[r]]}}}}catch(e){}if(process.env.VISUAL){return[process.env.VISUAL]}else if(process.env.EDITOR){return[process.env.EDITOR]}return[null]}},514:function(e,n,t){const r=t(622);e.exports=function getArgumentsForPosition(e,n,t,a=1){const p=r.basename(e).replace(/\.(exe|cmd|bat)$/i,"");switch(p){case"atom":case"Atom":case"Atom Beta":case"subl":case"sublime":case"sublime_text":case"wstorm":case"charm":return[`${n}:${t}:${a}`];case"notepad++":return["-n"+t,n];case"vim":case"mvim":return[`+call cursor(${t}, ${a})`,n];case"joe":return["+"+`${t}`,n];case"emacs":case"emacsclient":return[`+${t}:${a}`,n];case"rmate":case"mate":case"mine":return["--line",t,n];case"code":case"code-insiders":case"Code":return["-r","-g",`${n}:${t}:${a}`];case"appcode":case"clion":case"clion64":case"idea":case"idea64":case"phpstorm":case"phpstorm64":case"pycharm":case"pycharm64":case"rubymine":case"rubymine64":case"webstorm":case"webstorm64":return["--line",t,n]}return[n]}},622:function(e){e.exports=require("path")},736:function(e){e.exports=require("next/dist/compiled/chalk")},747:function(e){e.exports=require("fs")},788:function(e){e.exports={"/Applications/Atom.app/Contents/MacOS/Atom":"atom","/Applications/Atom Beta.app/Contents/MacOS/Atom Beta":"/Applications/Atom Beta.app/Contents/MacOS/Atom Beta","/Applications/Brackets.app/Contents/MacOS/Brackets":"brackets","/Applications/Sublime Text.app/Contents/MacOS/Sublime Text":"/Applications/Sublime Text.app/Contents/SharedSupport/bin/subl","/Applications/Sublime Text 2.app/Contents/MacOS/Sublime Text 2":"/Applications/Sublime Text 2.app/Contents/SharedSupport/bin/subl","/Applications/Sublime Text Dev.app/Contents/MacOS/Sublime Text":"/Applications/Sublime Text Dev.app/Contents/SharedSupport/bin/subl","/Applications/Visual Studio Code.app/Contents/MacOS/Electron":"code","/Applications/Visual Studio Code - Insiders.app/Contents/MacOS/Electron":"code-insiders","/Applications/AppCode.app/Contents/MacOS/appcode":"/Applications/AppCode.app/Contents/MacOS/appcode","/Applications/CLion.app/Contents/MacOS/clion":"/Applications/CLion.app/Contents/MacOS/clion","/Applications/IntelliJ IDEA.app/Contents/MacOS/idea":"/Applications/IntelliJ IDEA.app/Contents/MacOS/idea","/Applications/PhpStorm.app/Contents/MacOS/phpstorm":"/Applications/PhpStorm.app/Contents/MacOS/phpstorm","/Applications/PyCharm.app/Contents/MacOS/pycharm":"/Applications/PyCharm.app/Contents/MacOS/pycharm","/Applications/PyCharm CE.app/Contents/MacOS/pycharm":"/Applications/PyCharm CE.app/Contents/MacOS/pycharm","/Applications/RubyMine.app/Contents/MacOS/rubymine":"/Applications/RubyMine.app/Contents/MacOS/rubymine","/Applications/WebStorm.app/Contents/MacOS/webstorm":"/Applications/WebStorm.app/Contents/MacOS/webstorm"}}});
\ No newline at end of file
diff --git a/packages/next/compiled/launch-editor/package.json b/packages/next/compiled/launch-editor/package.json
deleted file mode 100644
index 8c8d27816deec..0000000000000
--- a/packages/next/compiled/launch-editor/package.json
+++ /dev/null
@@ -1 +0,0 @@
-{"name":"launch-editor","main":"index.js","author":"Evan You","license":"MIT"}
diff --git a/packages/next/compiled/terser-webpack-plugin/cjs.js b/packages/next/compiled/terser-webpack-plugin/cjs.js
index dd73011cfd49a..0cee27cbb1ffa 100644
--- a/packages/next/compiled/terser-webpack-plugin/cjs.js
+++ b/packages/next/compiled/terser-webpack-plugin/cjs.js
@@ -1 +1 @@
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{`);r.push(d.indent(this.hooks.require.call("",t,e)));r.push("}");r.push("");r.push(d.asString(this.hooks.requireExtensions.call("",t,e)));r.push("");r.push(d.asString(this.hooks.beforeStartup.call("",t,e)));const o=d.asString(this.hooks.afterStartup.call("",t,e));if(o){r.push("var startupResult = (function() {")}r.push(d.asString(this.hooks.startup.call("",t,e)));if(o){r.push("})();");r.push(o);r.push("return startupResult;")}return r}render(e,t,s,o){const i=this.renderBootstrap(e,t,s,o);let a=this.hooks.render.call(new r(d.prefix(i," \t")+"\n","webpack/bootstrap"),t,e,s,o);if(t.hasEntryModule()){a=this.hooks.renderWithEntry.call(a,t,e)}if(!a){throw new Error("Compiler error: MainTemplate plugin 'render' should return something")}t.rendered=true;return new n(a,";")}renderRequireFunctionForModule(e,t,s){return this.hooks.moduleRequire.call(this.requireFn,t,e,s)}renderAddModule(e,t,s,n){return this.hooks.addModule.call(`modules[${s}] = ${n};`,t,e,s,n)}renderCurrentHashCode(e,t){t=t||Infinity;return this.hooks.currentHash.call(JSON.stringify(e.substr(0,t)),t)}getPublicPath(e){return this.hooks.assetPath.call(this.outputOptions.publicPath||"",e)}getAssetPath(e,t){return this.hooks.assetPath.call(e,t)}getAssetPathWithInfo(e,t){const s={};const n=this.hooks.assetPath.call(e,t,s);return{path:n,info:s}}updateHash(e){e.update("maintemplate");e.update("3");this.hooks.hash.call(e)}updateHashForChunk(e,t,s,n){this.updateHash(e);this.hooks.hashForChunk.call(e,t);for(const r of this.renderBootstrap("0000",t,s,n)){e.update(r)}}useChunkHash(e){const t=this.hooks.globalHashPaths.call([]);return!this.hooks.globalHash.call(e,t)}}},253:function(e,t,s){"use strict";const n=s(14);class ModuleDependencyError extends n{constructor(e,t,s){super(t.message);this.name="ModuleDependencyError";this.details=t.stack.split("\n").slice(1).join("\n");this.module=e;this.loc=s;this.error=t;this.origin=e.issuer;Error.captureStackTrace(this,this.constructor)}}e.exports=ModuleDependencyError},268:function(e){"use strict";class HookCodeFactory{constructor(e){this.config=e;this.options=undefined;this._args=undefined}create(e){this.init(e);let t;switch(this.options.type){case"sync":t=new Function(this.args(),'"use strict";\n'+this.header()+this.content({onError:e=>`throw ${e};\n`,onResult:e=>`return ${e};\n`,resultReturns:true,onDone:()=>"",rethrowIfPossible:true}));break;case"async":t=new Function(this.args({after:"_callback"}),'"use strict";\n'+this.header()+this.content({onError:e=>`_callback(${e});\n`,onResult:e=>`_callback(null, ${e});\n`,onDone:()=>"_callback();\n"}));break;case"promise":let e=false;const s=this.content({onError:t=>{e=true;return`_error(${t});\n`},onResult:e=>`_resolve(${e});\n`,onDone:()=>"_resolve();\n"});let n="";n+='"use strict";\n';n+="return new Promise((_resolve, _reject) => {\n";if(e){n+="var _sync = true;\n";n+="function _error(_err) {\n";n+="if(_sync)\n";n+="_resolve(Promise.resolve().then(() => { throw _err; }));\n";n+="else\n";n+="_reject(_err);\n";n+="};\n"}n+=this.header();n+=s;if(e){n+="_sync = false;\n"}n+="});\n";t=new Function(this.args(),n);break}this.deinit();return t}setup(e,t){e._x=t.taps.map(e=>e.fn)}init(e){this.options=e;this._args=e.args.slice()}deinit(){this.options=undefined;this._args=undefined}header(){let e="";if(this.needContext()){e+="var _context = {};\n"}else{e+="var _context;\n"}e+="var _x = this._x;\n";if(this.options.interceptors.length>0){e+="var _taps = this.taps;\n";e+="var _interceptors = this.interceptors;\n"}for(let t=0;t<this.options.interceptors.length;t++){const s=this.options.interceptors[t];if(s.call){e+=`${this.getInterceptor(t)}.call(${this.args({before:s.context?"_context":undefined})});\n`}}return e}needContext(){for(const e of this.options.taps)if(e.context)return true;return false}callTap(e,{onError:t,onResult:s,onDone:n,rethrowIfPossible:r}){let o="";let i=false;for(let t=0;t<this.options.interceptors.length;t++){const s=this.options.interceptors[t];if(s.tap){if(!i){o+=`var _tap${e} = ${this.getTap(e)};\n`;i=true}o+=`${this.getInterceptor(t)}.tap(${s.context?"_context, ":""}_tap${e});\n`}}o+=`var _fn${e} = ${this.getTapFn(e)};\n`;const a=this.options.taps[e];switch(a.type){case"sync":if(!r){o+=`var _hasError${e} = false;\n`;o+="try {\n"}if(s){o+=`var _result${e} = _fn${e}(${this.args({before:a.context?"_context":undefined})});\n`}else{o+=`_fn${e}(${this.args({before:a.context?"_context":undefined})});\n`}if(!r){o+="} catch(_err) {\n";o+=`_hasError${e} = true;\n`;o+=t("_err");o+="}\n";o+=`if(!_hasError${e}) {\n`}if(s){o+=s(`_result${e}`)}if(n){o+=n()}if(!r){o+="}\n"}break;case"async":let i="";if(s)i+=`(_err${e}, _result${e}) => {\n`;else i+=`_err${e} => {\n`;i+=`if(_err${e}) {\n`;i+=t(`_err${e}`);i+="} else {\n";if(s){i+=s(`_result${e}`)}if(n){i+=n()}i+="}\n";i+="}";o+=`_fn${e}(${this.args({before:a.context?"_context":undefined,after:i})});\n`;break;case"promise":o+=`var _hasResult${e} = false;\n`;o+=`var _promise${e} = _fn${e}(${this.args({before:a.context?"_context":undefined})});\n`;o+=`if (!_promise${e} || !_promise${e}.then)\n`;o+=`  throw new Error('Tap function (tapPromise) did not return promise (returned ' + _promise${e} + ')');\n`;o+=`_promise${e}.then(_result${e} => {\n`;o+=`_hasResult${e} = true;\n`;if(s){o+=s(`_result${e}`)}if(n){o+=n()}o+=`}, _err${e} => {\n`;o+=`if(_hasResult${e}) throw _err${e};\n`;o+=t(`_err${e}`);o+="});\n";break}return o}callTapsSeries({onError:e,onResult:t,resultReturns:s,onDone:n,doneReturns:r,rethrowIfPossible:o}){if(this.options.taps.length===0)return n();const i=this.options.taps.findIndex(e=>e.type!=="sync");const a=s||r||false;let l="";let u=n;for(let s=this.options.taps.length-1;s>=0;s--){const r=s;const c=u!==n&&this.options.taps[r].type!=="sync";if(c){l+=`function _next${r}() {\n`;l+=u();l+=`}\n`;u=(()=>`${a?"return ":""}_next${r}();\n`)}const d=u;const h=e=>{if(e)return"";return n()};const f=this.callTap(r,{onError:t=>e(r,t,d,h),onResult:t&&(e=>{return t(r,e,d,h)}),onDone:!t&&d,rethrowIfPossible:o&&(i<0||r<i)});u=(()=>f)}l+=u();return l}callTapsLooping({onError:e,onDone:t,rethrowIfPossible:s}){if(this.options.taps.length===0)return t();const n=this.options.taps.every(e=>e.type==="sync");let r="";if(!n){r+="var _looper = () => {\n";r+="var _loopAsync = false;\n"}r+="var _loop;\n";r+="do {\n";r+="_loop = false;\n";for(let e=0;e<this.options.interceptors.length;e++){const t=this.options.interceptors[e];if(t.loop){r+=`${this.getInterceptor(e)}.loop(${this.args({before:t.context?"_context":undefined})});\n`}}r+=this.callTapsSeries({onError:e,onResult:(e,t,s,r)=>{let o="";o+=`if(${t} !== undefined) {\n`;o+="_loop = true;\n";if(!n)o+="if(_loopAsync) _looper();\n";o+=r(true);o+=`} else {\n`;o+=s();o+=`}\n`;return o},onDone:t&&(()=>{let e="";e+="if(!_loop) {\n";e+=t();e+="}\n";return e}),rethrowIfPossible:s&&n});r+="} while(_loop);\n";if(!n){r+="_loopAsync = true;\n";r+="};\n";r+="_looper();\n"}return r}callTapsParallel({onError:e,onResult:t,onDone:s,rethrowIfPossible:n,onTap:r=((e,t)=>t())}){if(this.options.taps.length<=1){return this.callTapsSeries({onError:e,onResult:t,onDone:s,rethrowIfPossible:n})}let o="";o+="do {\n";o+=`var _counter = ${this.options.taps.length};\n`;if(s){o+="var _done = () => {\n";o+=s();o+="};\n"}for(let i=0;i<this.options.taps.length;i++){const a=()=>{if(s)return"if(--_counter === 0) _done();\n";else return"--_counter;"};const l=e=>{if(e||!s)return"_counter = 0;\n";else return"_counter = 0;\n_done();\n"};o+="if(_counter <= 0) break;\n";o+=r(i,()=>this.callTap(i,{onError:t=>{let s="";s+="if(_counter > 0) {\n";s+=e(i,t,a,l);s+="}\n";return s},onResult:t&&(e=>{let s="";s+="if(_counter > 0) {\n";s+=t(i,e,a,l);s+="}\n";return s}),onDone:!t&&(()=>{return a()}),rethrowIfPossible:n}),a,l)}o+="} while(false);\n";return o}args({before:e,after:t}={}){let s=this._args;if(e)s=[e].concat(s);if(t)s=s.concat(t);if(s.length===0){return""}else{return s.join(", ")}}getTapFn(e){return`_x[${e}]`}getTap(e){return`_taps[${e}]`}getInterceptor(e){return`_interceptors[${e}]`}}e.exports=HookCodeFactory},278:function(e){"use strict";class Hook{constructor(e){if(!Array.isArray(e))e=[];this._args=e;this.taps=[];this.interceptors=[];this.call=this._call;this.promise=this._promise;this.callAsync=this._callAsync;this._x=undefined}compile(e){throw new Error("Abstract: should be overriden")}_createCall(e){return this.compile({taps:this.taps,interceptors:this.interceptors,args:this._args,type:e})}tap(e,t){if(typeof e==="string")e={name:e};if(typeof e!=="object"||e===null)throw new Error("Invalid arguments to tap(options: Object, fn: function)");e=Object.assign({type:"sync",fn:t},e);if(typeof e.name!=="string"||e.name==="")throw new Error("Missing name for tap");e=this._runRegisterInterceptors(e);this._insert(e)}tapAsync(e,t){if(typeof e==="string")e={name:e};if(typeof e!=="object"||e===null)throw new Error("Invalid arguments to tapAsync(options: Object, fn: function)");e=Object.assign({type:"async",fn:t},e);if(typeof e.name!=="string"||e.name==="")throw new Error("Missing name for tapAsync");e=this._runRegisterInterceptors(e);this._insert(e)}tapPromise(e,t){if(typeof e==="string")e={name:e};if(typeof e!=="object"||e===null)throw new Error("Invalid arguments to tapPromise(options: Object, fn: function)");e=Object.assign({type:"promise",fn:t},e);if(typeof e.name!=="string"||e.name==="")throw new Error("Missing name for tapPromise");e=this._runRegisterInterceptors(e);this._insert(e)}_runRegisterInterceptors(e){for(const t of this.interceptors){if(t.register){const s=t.register(e);if(s!==undefined)e=s}}return e}withOptions(e){const t=t=>Object.assign({},e,typeof t==="string"?{name:t}:t);e=Object.assign({},e,this._withOptions);const s=this._withOptionsBase||this;const n=Object.create(s);n.tapAsync=((e,n)=>s.tapAsync(t(e),n)),n.tap=((e,n)=>s.tap(t(e),n));n.tapPromise=((e,n)=>s.tapPromise(t(e),n));n._withOptions=e;n._withOptionsBase=s;return n}isUsed(){return this.taps.length>0||this.interceptors.length>0}intercept(e){this._resetCompilation();this.interceptors.push(Object.assign({},e));if(e.register){for(let t=0;t<this.taps.length;t++)this.taps[t]=e.register(this.taps[t])}}_resetCompilation(){this.call=this._call;this.callAsync=this._callAsync;this.promise=this._promise}_insert(e){this._resetCompilation();let t;if(typeof e.before==="string")t=new Set([e.before]);else if(Array.isArray(e.before)){t=new Set(e.before)}let s=0;if(typeof e.stage==="number")s=e.stage;let n=this.taps.length;while(n>0){n--;const e=this.taps[n];this.taps[n+1]=e;const r=e.stage||0;if(t){if(t.has(e.name)){t.delete(e.name);continue}if(t.size>0){continue}}if(r>s){continue}n++;break}this.taps[n]=e}}function createCompileDelegate(e,t){return function lazyCompileHook(...s){this[e]=this._createCall(t);return this[e](...s)}}Object.defineProperties(Hook.prototype,{_call:{value:createCompileDelegate("call","sync"),configurable:true,writable:true},_promise:{value:createCompileDelegate("promise","promise"),configurable:true,writable:true},_callAsync:{value:createCompileDelegate("callAsync","async"),configurable:true,writable:true}});e.exports=Hook},284:function(e){"use strict";const t=e=>{if(e===null)return"";if(typeof e==="string")return e;if(typeof e==="number")return`${e}`;if(typeof e==="object"){if("line"in e&&"column"in e){return`${e.line}:${e.column}`}else if("line"in e){return`${e.line}:?`}else if("index"in e){return`+${e.index}`}else{return""}}return""};const s=e=>{if(e===null)return"";if(typeof e==="string")return e;if(typeof e==="number")return`${e}`;if(typeof e==="object"){if("start"in e&&e.start&&"end"in e&&e.end){if(typeof e.start==="object"&&typeof e.start.line==="number"&&typeof e.end==="object"&&typeof e.end.line==="number"&&typeof e.end.column==="number"&&e.start.line===e.end.line){return`${t(e.start)}-${e.end.column}`}else{return`${t(e.start)}-${t(e.end)}`}}if("start"in e&&e.start){return t(e.start)}if("name"in e&&"index"in e){return`${e.name}[${e.index}]`}if("name"in e){return e.name}return t(e)}return""};e.exports=s},305:function(e,t,s){"use strict";Object.defineProperty(t,"__esModule",{value:true});t.default=void 0;var n=_interopRequireDefault(s(622));var r=_interopRequireDefault(s(87));var o=s(241);var i=s(745);var a=_interopRequireDefault(s(432));var l=s(78);var u=_interopRequireDefault(s(134));var c=_interopRequireDefault(s(946));var d=_interopRequireDefault(s(352));var h=_interopRequireDefault(s(499));var f=_interopRequireDefault(s(733));var p=_interopRequireDefault(s(825));var m=s(726);function _interopRequireDefault(e){return e&&e.__esModule?e:{default:e}}class TerserPlugin{constructor(e={}){(0,u.default)(p.default,e,{name:"Terser Plugin",baseDataPath:"options"});const{minify:t,terserOptions:s={},test:n=/\.m?js(\?.*)?$/i,extractComments:r=true,sourceMap:o,cache:i=true,cacheKeys:a=(e=>e),parallel:l=true,include:c,exclude:d}=e;this.options={test:n,extractComments:r,sourceMap:o,cache:i,cacheKeys:a,parallel:l,include:c,exclude:d,minify:t,terserOptions:s}}static isSourceMap(e){return Boolean(e&&e.version&&e.sources&&Array.isArray(e.sources)&&typeof e.mappings==="string")}static buildError(e,t,s,n){if(e.line){const r=s&&s.originalPositionFor({line:e.line,column:e.col});if(r&&r.source&&n){return new Error(`${t} from Terser\n${e.message} 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o.create(e)}}e.exports=SyncWaterfallHook},733:function(e){e.exports=require("jest-worker")},745:function(e){e.exports=require("webpack-sources")},759:function(e,t,s){const{ConcatSource:n}=s(745);const r=s(365);const o="a".charCodeAt(0);const i="A".charCodeAt(0);const a="z".charCodeAt(0)-o+1;const l=/^function\s?\(\)\s?\{\r?\n?|\r?\n?\}$/g;const u=/^\t/gm;const c=/\r?\n/g;const d=/^([^a-zA-Z$_])/;const h=/[^a-zA-Z0-9$]+/g;const f=/\*\//g;const p=/[^a-zA-Z0-9_!§$()=\-^°]+/g;const m=/^-|-$/g;const g=(e,t)=>{const s=e.id+"";const n=t.id+"";if(s<n)return-1;if(s>n)return 1;return 0};class Template{static getFunctionContent(e){return e.toString().replace(l,"").replace(u,"").replace(c,"\n")}static toIdentifier(e){if(typeof e!=="string")return"";return e.replace(d,"_$1").replace(h,"_")}static toComment(e){if(!e)return"";return`/*! ${e.replace(f,"* /")} */`}static toNormalComment(e){if(!e)return"";return`/* ${e.replace(f,"* /")} */`}static toPath(e){if(typeof e!=="string")return"";return 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B=(e,t)=>{for(let s=0;s<e.length;s++){const n=e[s].dependencies;for(let e=0;e<n.length;e++){t(n[e])}}};const F=(e,t)=>{for(let s=0;s<e.length;s++){t(e[s])}};const G=(e,t)=>{for(const s of t){e.add(s)}};const N=(e,t)=>{if(e===t)return true;let s=e.source();let n=t.source();if(s===n)return true;if(typeof s==="string"&&typeof n==="string")return false;if(!Buffer.isBuffer(s))s=Buffer.from(s,"utf-8");if(!Buffer.isBuffer(n))n=Buffer.from(n,"utf-8");return s.equals(n)};class Compilation extends i{constructor(e){super();this.hooks={buildModule:new a(["module"]),rebuildModule:new a(["module"]),failedModule:new a(["module","error"]),succeedModule:new a(["module"]),addEntry:new a(["entry","name"]),failedEntry:new a(["entry","name","error"]),succeedEntry:new a(["entry","name","module"]),dependencyReference:new u(["dependencyReference","dependency","module"]),finishModules:new c(["modules"]),finishRebuildingModule:new a(["module"]),unseal:new a([]),seal:new a([]),beforeChunks:new 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this.modules){e.unseal()}}seal(e){this.hooks.seal.call();while(this.hooks.optimizeDependenciesBasic.call(this.modules)||this.hooks.optimizeDependencies.call(this.modules)||this.hooks.optimizeDependenciesAdvanced.call(this.modules)){}this.hooks.afterOptimizeDependencies.call(this.modules);this.hooks.beforeChunks.call();for(const e of this._preparedEntrypoints){const t=e.module;const s=e.name;const n=this.addChunk(s);const r=new 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e(t)}this.hooks.afterOptimizeTree.call(this.chunks,this.modules);while(this.hooks.optimizeChunkModulesBasic.call(this.chunks,this.modules)||this.hooks.optimizeChunkModules.call(this.chunks,this.modules)||this.hooks.optimizeChunkModulesAdvanced.call(this.chunks,this.modules)){}this.hooks.afterOptimizeChunkModules.call(this.chunks,this.modules);const s=this.hooks.shouldRecord.call()!==false;this.hooks.reviveModules.call(this.modules,this.records);this.hooks.optimizeModuleOrder.call(this.modules);this.hooks.advancedOptimizeModuleOrder.call(this.modules);this.hooks.beforeModuleIds.call(this.modules);this.hooks.moduleIds.call(this.modules);this.applyModuleIds();this.hooks.optimizeModuleIds.call(this.modules);this.hooks.afterOptimizeModuleIds.call(this.modules);this.sortItemsWithModuleIds();this.hooks.reviveChunks.call(this.chunks,this.records);this.hooks.optimizeChunkOrder.call(this.chunks);this.hooks.beforeChunkIds.call(this.chunks);this.applyChunkIds();this.hooks.optimizeChunkIds.call(this.chunks);this.hooks.afterOptimizeChunkIds.call(this.chunks);this.sortItemsWithChunkIds();if(s){this.hooks.recordModules.call(this.modules,this.records);this.hooks.recordChunks.call(this.chunks,this.records)}this.hooks.beforeHash.call();this.createHash();this.hooks.afterHash.call();if(s){this.hooks.recordHash.call(this.records)}this.hooks.beforeModuleAssets.call();this.createModuleAssets();if(this.hooks.shouldGenerateChunkAssets.call()!==false){this.hooks.beforeChunkAssets.call();this.createChunkAssets()}this.hooks.additionalChunkAssets.call(this.chunks);this.summarizeDependencies();if(s){this.hooks.record.call(this,this.records)}this.hooks.additionalAssets.callAsync(t=>{if(t){return 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t=this.chunks;for(let e=0;e<t.length;e++){t[e].sortItems()}t.sort((e,t)=>e.compareTo(t))}sortItemsWithChunkIds(){for(const e of this.chunkGroups){e.sortItems()}this.chunks.sort(R);for(let e=0;e<this.modules.length;e++){this.modules[e].sortItems(true)}const e=this.chunks;for(let t=0;t<e.length;t++){e[t].sortItems()}const t=(e,t)=>{const s=`${e.message}`;const n=`${t.message}`;if(s<n)return-1;if(n<s)return 1;return 0};this.errors.sort(t);this.warnings.sort(t);this.children.sort(q)}summarizeDependencies(){this.fileDependencies=new O(this.compilationDependencies);this.contextDependencies=new O;this.missingDependencies=new O;for(let e=0;e<this.children.length;e++){const t=this.children[e];G(this.fileDependencies,t.fileDependencies);G(this.contextDependencies,t.contextDependencies);G(this.missingDependencies,t.missingDependencies)}for(let e=0;e<this.modules.length;e++){const 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o=M(s);o.update(this.fullHash);o.update(e);this.fullHash=o.digest(n);this.hash=this.fullHash.substr(0,r)}emitAsset(e,t,s={}){if(this.assets[e]){if(!N(this.assets[e],t)){this.warnings.push(new P(`Conflict: Multiple assets emit different content to the same filename ${e}`));this.assets[e]=t;this.assetsInfo.set(e,s);return}const n=this.assetsInfo.get(e);this.assetsInfo.set(e,Object.assign({},n,s));return}this.assets[e]=t;this.assetsInfo.set(e,s)}updateAsset(e,t,s=undefined){if(!this.assets[e]){throw new Error(`Called Compilation.updateAsset for not existing filename ${e}`)}if(typeof t==="function"){this.assets[e]=t(this.assets[e])}else{this.assets[e]=t}if(s!==undefined){const t=this.assetsInfo.get(e);if(typeof s==="function"){this.assetsInfo.set(e,s(t||{}))}else{this.assetsInfo.set(e,Object.assign({},t,s))}}}getAssets(){const e=[];for(const t of 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n}}const o=new AsyncParallelBailHookCodeFactory;class AsyncParallelBailHook extends n{compile(e){o.setup(this,e);return o.create(e)}}Object.defineProperties(AsyncParallelBailHook.prototype,{_call:{value:undefined,configurable:true,writable:true}});e.exports=AsyncParallelBailHook},995:function(e,t,s){"use strict";const n=s(622);const r=/\\/g;const o=/[-[\]{}()*+?.,\\^$|#\s]/g;const i=/[/\\]$/;const a=/^!|!$/g;const l=/\/index.js(!|\?|\(query\))/g;const u=/!=!/;const c=e=>{return e.replace(r,"/")};const d=e=>{const t=e.replace(o,"\\$&");return new RegExp(`(^|!)${t}`,"g")};class RequestShortener{constructor(e){e=c(e);if(i.test(e)){e=e.substr(0,e.length-1)}if(e){this.currentDirectoryRegExp=d(e)}const t=n.dirname(e);const s=i.test(t);const r=s?t.substr(0,t.length-1):t;if(r&&r!==e){this.parentDirectoryRegExp=d(`${r}/`)}if(__dirname.length>=2){const e=c(n.join(__dirname,".."));const t=this.currentDirectoryRegExp&&this.currentDirectoryRegExp.test(e);this.buildinsAsModule=t;this.buildinsRegExp=d(e)}this.cache=new Map}shorten(e){if(!e)return e;const t=this.cache.get(e);if(t!==undefined){return t}let s=c(e);if(this.buildinsAsModule&&this.buildinsRegExp){s=s.replace(this.buildinsRegExp,"!(webpack)")}if(this.currentDirectoryRegExp){s=s.replace(this.currentDirectoryRegExp,"!.")}if(this.parentDirectoryRegExp){s=s.replace(this.parentDirectoryRegExp,"!../")}if(!this.buildinsAsModule&&this.buildinsRegExp){s=s.replace(this.buildinsRegExp,"!(webpack)")}s=s.replace(l,"$1");s=s.replace(a,"");s=s.replace(u," = ");this.cache.set(e,s);return s}}e.exports=RequestShortener},996:function(e,t,s){"use strict";const n=s(278);const r=s(268);class AsyncSeriesBailHookCodeFactory extends r{content({onError:e,onResult:t,resultReturns:s,onDone:n}){return this.callTapsSeries({onError:(t,s,n,r)=>e(s)+r(true),onResult:(e,s,n)=>`if(${s} !== undefined) {\n${t(s)};\n} else {\n${n()}}\n`,resultReturns:s,onDone:n})}}const o=new AsyncSeriesBailHookCodeFactory;class AsyncSeriesBailHook extends n{compile(e){o.setup(this,e);return o.create(e)}}Object.defineProperties(AsyncSeriesBailHook.prototype,{_call:{value:undefined,configurable:true,writable:true}});e.exports=AsyncSeriesBailHook}},function(e){"use strict";!function(){e.nmd=function(e){e.paths=[];if(!e.children)e.children=[];Object.defineProperty(e,"loaded",{enumerable:true,get:function(){return e.l}});Object.defineProperty(e,"id",{enumerable:true,get:function(){return e.i}});return e}}()});
\ No newline at end of file
diff --git a/packages/next/compiled/terser-webpack-plugin/minify.js b/packages/next/compiled/terser-webpack-plugin/minify.js
index b70a9392c080a..e03a96a8433f3 100644
--- a/packages/next/compiled/terser-webpack-plugin/minify.js
+++ b/packages/next/compiled/terser-webpack-plugin/minify.js
@@ -6,7 +6,6 @@ const {
 
 const buildTerserOptions = ({
   ecma,
-  warnings,
   parse = {},
   compress = {},
   mangle,
@@ -43,8 +42,7 @@ const buildTerserOptions = ({
   module,
   nameCache,
   safari10,
-  toplevel,
-  warnings
+  toplevel
 });
 
 function isObject(value) {
@@ -133,9 +131,9 @@ const buildComments = (options, terserOptions, extractedComments) => {
   };
 };
 
-const minify = options => {
+async function minify(options) {
   const {
-    file,
+    name,
     input,
     inputSourceMap,
     minify: minifyFn
@@ -143,7 +141,7 @@ const minify = options => {
 
   if (minifyFn) {
     return minifyFn({
-      [file]: input
+      [name]: input
     }, inputSourceMap);
   } // Copy terser options
 
@@ -158,35 +156,20 @@ const minify = options => {
 
   const extractedComments = [];
   terserOptions.output.comments = buildComments(options, terserOptions, extractedComments);
-  const {
-    error,
-    map,
-    code,
-    warnings
-  } = terserMinify({
-    [file]: input
+  const result = await terserMinify({
+    [name]: input
   }, terserOptions);
-  return {
-    error,
-    map,
-    code,
-    warnings,
+  return { ...result,
     extractedComments
   };
-};
+}
 
 function transform(options) {
   // 'use strict' => this === undefined (Clean Scope)
   // Safer for possible security issues, albeit not critical at all here
   // eslint-disable-next-line no-new-func, no-param-reassign
   options = new Function('exports', 'require', 'module', '__filename', '__dirname', `'use strict'\nreturn ${options}`)(exports, require, module, __filename, __dirname);
-  const result = minify(options);
-
-  if (result.error) {
-    throw result.error;
-  } else {
-    return result;
-  }
+  return minify(options);
 }
 
 module.exports.minify = minify;
diff --git a/packages/next/compiled/terser/bundle.min.js b/packages/next/compiled/terser/bundle.min.js
index 67a46b82cf7e7..686fb409623b6 100644
--- a/packages/next/compiled/terser/bundle.min.js
+++ b/packages/next/compiled/terser/bundle.min.js
@@ -1 +1 @@
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get_full_char(e,t){if(is_surrogate_pair_head(e.charCodeAt(t))){if(is_surrogate_pair_tail(e.charCodeAt(t+1))){return e.charAt(t)+e.charAt(t+1)}}else if(is_surrogate_pair_tail(e.charCodeAt(t))){if(is_surrogate_pair_head(e.charCodeAt(t-1))){return e.charAt(t-1)+e.charAt(t)}}return e.charAt(t)}function get_full_char_code(e,t){if(is_surrogate_pair_head(e.charCodeAt(t))){return 65536+(e.charCodeAt(t)-55296<<10)+e.charCodeAt(t+1)-56320}return e.charCodeAt(t)}function get_full_char_length(e){var t=0;for(var n=0;n<e.length;n++){if(is_surrogate_pair_head(e.charCodeAt(n))&&is_surrogate_pair_tail(e.charCodeAt(n+1))){t++;n++}}return e.length-t}function from_char_code(e){if(e>65535){e-=65536;return String.fromCharCode((e>>10)+55296)+String.fromCharCode(e%1024+56320)}return String.fromCharCode(e)}function is_surrogate_pair_head(e){return e>=55296&&e<=56319}function is_surrogate_pair_tail(e){return e>=56320&&e<=57343}function is_digit(e){return e>=48&&e<=57}function is_identifier_start(e){return S.ID_Start.test(e)}function is_identifier_char(e){return S.ID_Continue.test(e)}function is_basic_identifier_string(e){return/^[a-z_$][a-z0-9_$]*$/i.test(e)}function is_identifier_string(e,t){if(/^[a-z_$][a-z0-9_$]*$/i.test(e)){return true}if(!t&&/[\ud800-\udfff]/.test(e)){return false}var n=S.ID_Start.exec(e);if(!n||n.index!==0){return false}e=e.slice(n[0].length);if(!e){return true}n=S.ID_Continue.exec(e);return!!n&&n[0].length===e.length}function parse_js_number(e,t=true){if(!t&&e.includes("e")){return NaN}if(p.test(e)){return parseInt(e.substr(2),16)}else if(_.test(e)){return parseInt(e.substr(1),8)}else if(h.test(e)){return parseInt(e.substr(2),8)}else if(d.test(e)){return parseInt(e.substr(2),2)}else if(m.test(e)){return parseFloat(e)}else{var n=parseFloat(e);if(n==e)return n}}class JS_Parse_Error extends Error{constructor(e,t,n,i,r){super();this.name="SyntaxError";this.message=e;this.filename=t;this.line=n;this.col=i;this.pos=r}}function js_error(e,t,n,i,r){throw new JS_Parse_Error(e,t,n,i,r)}function is_token(e,t,n){return e.type==t&&(n==null||e.value==n)}var A={};function tokenizer(e,t,n,i){var r={text:e,filename:t,pos:0,tokpos:0,line:1,tokline:0,col:0,tokcol:0,newline_before:false,regex_allowed:false,brace_counter:0,template_braces:[],comments_before:[],directives:{},directive_stack:[]};function peek(){return get_full_char(r.text,r.pos)}function next(e,t){var n=get_full_char(r.text,r.pos++);if(e&&!n)throw A;if(D.has(n)){r.newline_before=r.newline_before||!t;++r.line;r.col=0;if(n=="\r"&&peek()=="\n"){++r.pos;n="\n"}}else{if(n.length>1){++r.pos;++r.col}++r.col}return n}function forward(e){while(e--)next()}function looking_at(e){return r.text.substr(r.pos,e.length)==e}function find_eol(){var e=r.text;for(var t=r.pos,n=r.text.length;t<n;++t){var i=e[t];if(D.has(i))return t}return-1}function find(e,t){var n=r.text.indexOf(e,r.pos);if(t&&n==-1)throw A;return n}function start_token(){r.tokline=r.line;r.tokcol=r.col;r.tokpos=r.pos}var a=false;var h=null;function token(n,i,o){r.regex_allowed=n=="operator"&&!C.has(i)||n=="keyword"&&c.has(i)||n=="punc"&&y.has(i)||n=="arrow";if(n=="punc"&&i=="."){a=true}else if(!o){a=false}var s={type:n,value:i,line:r.tokline,col:r.tokcol,pos:r.tokpos,endline:r.line,endcol:r.col,endpos:r.pos,nlb:r.newline_before,file:t};if(/^(?:num|string|regexp)$/i.test(n)){s.raw=e.substring(s.pos,s.endpos)}if(!o){s.comments_before=r.comments_before;s.comments_after=r.comments_before=[]}r.newline_before=false;s=new w(s);if(!o)h=s;return s}function skip_whitespace(){while(v.has(peek()))next()}function read_while(e){var t="",n,i=0;while((n=peek())&&e(n,i++))t+=next();return t}function parse_error(e){js_error(e,t,r.tokline,r.tokcol,r.tokpos)}function read_num(e){var t=false,n=false,i=false,r=e==".",a=false,o=false;var s=read_while(function(s,u){if(a)return false;var c=s.charCodeAt(0);switch(c){case 95:return o=true;case 98:case 66:return i=true;case 111:case 79:case 120:case 88:return i?false:i=true;case 101:case 69:return i?true:t?false:t=n=true;case 45:return n||u==0&&!e;case 43:return n;case n=false,46:return!r&&!i&&!t?r=true:false}if(s==="n"){a=true;return true}return f.test(s)});if(e)s=e+s;if(_.test(s)&&next_token.has_directive("use strict")){parse_error("Legacy octal literals are not allowed in strict mode")}if(o){if(s.endsWith("_")){parse_error("Numeric separators are not allowed at the end of numeric literals")}else if(s.includes("__")){parse_error("Only one underscore is allowed as numeric separator")}s=s.replace(/_/g,"")}if(s.endsWith("n")){const e=s.slice(0,-1);const t=p.test(e);const n=parse_js_number(e,t);if(!r&&E.test(s)&&!isNaN(n))return token("big_int",e);parse_error("Invalid or unexpected token")}var u=parse_js_number(s);if(!isNaN(u)){return token("num",u)}else{parse_error("Invalid syntax: "+s)}}function is_octal(e){return e>="0"&&e<="7"}function read_escaped_char(e,t,n){var i=next(true,e);switch(i.charCodeAt(0)){case 110:return"\n";case 114:return"\r";case 116:return"\t";case 98:return"\b";case 118:return"\v";case 102:return"\f";case 120:return String.fromCharCode(hex_bytes(2,t));case 117:if(peek()=="{"){next(true);if(peek()==="}")parse_error("Expecting hex-character between {}");while(peek()=="0")next(true);var a,o=find("}",true)-r.pos;if(o>6||(a=hex_bytes(o,t))>1114111){parse_error("Unicode reference out of bounds")}next(true);return from_char_code(a)}return String.fromCharCode(hex_bytes(4,t));case 10:return"";case 13:if(peek()=="\n"){next(true,e);return""}}if(is_octal(i)){if(n&&t){const e=i==="0"&&!is_octal(peek());if(!e){parse_error("Octal escape sequences are not allowed in template strings")}}return read_octal_escape_sequence(i,t)}return i}function read_octal_escape_sequence(e,t){var n=peek();if(n>="0"&&n<="7"){e+=next(true);if(e[0]<="3"&&(n=peek())>="0"&&n<="7")e+=next(true)}if(e==="0")return"\0";if(e.length>0&&next_token.has_directive("use strict")&&t)parse_error("Legacy octal escape sequences are not allowed in strict mode");return String.fromCharCode(parseInt(e,8))}function hex_bytes(e,t){var n=0;for(;e>0;--e){if(!t&&isNaN(parseInt(peek(),16))){return parseInt(n,16)||""}var i=next(true);if(isNaN(parseInt(i,16)))parse_error("Invalid hex-character pattern in string");n+=i}return parseInt(n,16)}var d=with_eof_error("Unterminated string constant",function(){var e=next(),t="";for(;;){var n=next(true,true);if(n=="\\")n=read_escaped_char(true,true);else if(n=="\r"||n=="\n")parse_error("Unterminated string constant");else if(n==e)break;t+=n}var i=token("string",t);i.quote=e;return i});var m=with_eof_error("Unterminated template",function(e){if(e){r.template_braces.push(r.brace_counter)}var t="",n="",i,a;next(true,true);while((i=next(true,true))!="`"){if(i=="\r"){if(peek()=="\n")++r.pos;i="\n"}else if(i=="$"&&peek()=="{"){next(true,true);r.brace_counter++;a=token(e?"template_head":"template_substitution",t);a.raw=n;return a}n+=i;if(i=="\\"){var o=r.pos;var s=h&&(h.type==="name"||h.type==="punc"&&(h.value===")"||h.value==="]"));i=read_escaped_char(true,!s,true);n+=r.text.substr(o,r.pos-o)}t+=i}r.template_braces.pop();a=token(e?"template_head":"template_substitution",t);a.raw=n;a.end=true;return a});function skip_line_comment(e){var t=r.regex_allowed;var n=find_eol(),i;if(n==-1){i=r.text.substr(r.pos);r.pos=r.text.length}else{i=r.text.substring(r.pos,n);r.pos=n}r.col=r.tokcol+(r.pos-r.tokpos);r.comments_before.push(token(e,i,true));r.regex_allowed=t;return next_token}var b=with_eof_error("Unterminated multiline comment",function(){var e=r.regex_allowed;var t=find("*/",true);var n=r.text.substring(r.pos,t).replace(/\r\n|\r|\u2028|\u2029/g,"\n");forward(get_full_char_length(n)+2);r.comments_before.push(token("comment2",n,true));r.newline_before=r.newline_before||n.includes("\n");r.regex_allowed=e;return next_token});var S=with_eof_error("Unterminated identifier name",function(){var e,t,n=false;var i=function(){n=true;next();if(peek()!=="u"){parse_error("Expecting UnicodeEscapeSequence -- uXXXX or u{XXXX}")}return read_escaped_char(false,true)};if((e=peek())==="\\"){e=i();if(!is_identifier_start(e)){parse_error("First identifier char is an invalid identifier char")}}else if(is_identifier_start(e)){next()}else{return""}while((t=peek())!=null){if((t=peek())==="\\"){t=i();if(!is_identifier_char(t)){parse_error("Invalid escaped identifier char")}}else{if(!is_identifier_char(t)){break}next()}e+=t}if(u.has(e)&&n){parse_error("Escaped characters are not allowed in keywords")}return e});var T=with_eof_error("Unterminated regular expression",function(e){var t=false,n,i=false;while(n=next(true))if(D.has(n)){parse_error("Unexpected line terminator")}else if(t){e+="\\"+n;t=false}else if(n=="["){i=true;e+=n}else if(n=="]"&&i){i=false;e+=n}else if(n=="/"&&!i){break}else if(n=="\\"){t=true}else{e+=n}const r=S();return token("regexp",{source:e,flags:r})});function read_operator(e){function grow(e){if(!peek())return e;var t=e+peek();if(g.has(t)){next();return grow(t)}else{return e}}return token("operator",grow(e||next()))}function handle_slash(){next();switch(peek()){case"/":next();return skip_line_comment("comment1");case"*":next();return b()}return r.regex_allowed?T(""):read_operator("/")}function handle_eq_sign(){next();if(peek()===">"){next();return token("arrow","=>")}else{return read_operator("=")}}function handle_dot(){next();if(is_digit(peek().charCodeAt(0))){return read_num(".")}if(peek()==="."){next();next();return token("expand","...")}return token("punc",".")}function read_word(){var e=S();if(a)return token("name",e);return s.has(e)?token("atom",e):!o.has(e)?token("name",e):g.has(e)?token("operator",e):token("keyword",e)}function with_eof_error(e,t){return function(n){try{return t(n)}catch(t){if(t===A)parse_error(e);else throw t}}}function next_token(e){if(e!=null)return T(e);if(i&&r.pos==0&&looking_at("#!")){start_token();forward(2);skip_line_comment("comment5")}for(;;){skip_whitespace();start_token();if(n){if(looking_at("\x3c!--")){forward(4);skip_line_comment("comment3");continue}if(looking_at("--\x3e")&&r.newline_before){forward(3);skip_line_comment("comment4");continue}}var t=peek();if(!t)return token("eof");var a=t.charCodeAt(0);switch(a){case 34:case 39:return d();case 46:return handle_dot();case 47:{var o=handle_slash();if(o===next_token)continue;return o}case 61:return handle_eq_sign();case 96:return m(true);case 123:r.brace_counter++;break;case 125:r.brace_counter--;if(r.template_braces.length>0&&r.template_braces[r.template_braces.length-1]===r.brace_counter)return m(false);break}if(is_digit(a))return read_num();if(k.has(t))return token("punc",next());if(l.has(t))return read_operator();if(a==92||is_identifier_start(t))return read_word();break}parse_error("Unexpected character '"+t+"'")}next_token.next=next;next_token.peek=peek;next_token.context=function(e){if(e)r=e;return r};next_token.add_directive=function(e){r.directive_stack[r.directive_stack.length-1].push(e);if(r.directives[e]===undefined){r.directives[e]=1}else{r.directives[e]++}};next_token.push_directives_stack=function(){r.directive_stack.push([])};next_token.pop_directives_stack=function(){var e=r.directive_stack[r.directive_stack.length-1];for(var t=0;t<e.length;t++){r.directives[e[t]]--}r.directive_stack.pop()};next_token.has_directive=function(e){return r.directives[e]>0};return next_token}var T=makePredicate(["typeof","void","delete","--","++","!","~","-","+"]);var C=makePredicate(["--","++"]);var x=makePredicate(["=","+=","-=","/=","*=","**=","%=",">>=","<<=",">>>=","|=","^=","&="]);var O=function(e,t){for(var n=0;n<e.length;++n){var i=e[n];for(var r=0;r<i.length;++r){t[i[r]]=n+1}}return t}([["||"],["??"],["&&"],["|"],["^"],["&"],["==","===","!=","!=="],["<",">","<=",">=","in","instanceof"],[">>","<<",">>>"],["+","-"],["*","/","%"],["**"]],{});var F=makePredicate(["atom","num","big_int","string","regexp","name"]);function parse(e,t){const n=new Map;t=defaults(t,{bare_returns:false,ecma:2017,expression:false,filename:null,html5_comments:true,module:false,shebang:true,strict:false,toplevel:null},true);var i={input:typeof e=="string"?tokenizer(e,t.filename,t.html5_comments,t.shebang):e,token:null,prev:null,peeked:null,in_function:0,in_async:-1,in_generator:-1,in_directives:true,in_loop:0,labels:[]};i.token=next();function is(e,t){return is_token(i.token,e,t)}function peek(){return i.peeked||(i.peeked=i.input())}function next(){i.prev=i.token;if(!i.peeked)peek();i.token=i.peeked;i.peeked=null;i.in_directives=i.in_directives&&(i.token.type=="string"||is("punc",";"));return i.token}function prev(){return i.prev}function croak(e,t,n,r){var a=i.input.context();js_error(e,a.filename,t!=null?t:a.tokline,n!=null?n:a.tokcol,r!=null?r:a.tokpos)}function token_error(e,t){croak(t,e.line,e.col)}function unexpected(e){if(e==null)e=i.token;token_error(e,"Unexpected token: "+e.type+" ("+e.value+")")}function expect_token(e,t){if(is(e,t)){return next()}token_error(i.token,"Unexpected token "+i.token.type+" «"+i.token.value+"»"+", expected "+e+" «"+t+"»")}function expect(e){return expect_token("punc",e)}function has_newline_before(e){return e.nlb||!e.comments_before.every(e=>!e.nlb)}function can_insert_semicolon(){return!t.strict&&(is("eof")||is("punc","}")||has_newline_before(i.token))}function is_in_generator(){return i.in_generator===i.in_function}function is_in_async(){return i.in_async===i.in_function}function semicolon(e){if(is("punc",";"))next();else if(!e&&!can_insert_semicolon())unexpected()}function parenthesised(){expect("(");var e=y(true);expect(")");return e}function embed_tokens(e){return function(...t){const n=i.token;const r=e(...t);r.start=n;r.end=prev();return r}}function handle_regexp(){if(is("operator","/")||is("operator","/=")){i.peeked=null;i.token=i.input(i.token.value.substr(1))}}var r=embed_tokens(function(e,n,a){handle_regexp();switch(i.token.type){case"string":if(i.in_directives){var u=peek();if(!i.token.raw.includes("\\")&&(is_token(u,"punc",";")||is_token(u,"punc","}")||has_newline_before(u)||is_token(u,"eof"))){i.input.add_directive(i.token.value)}else{i.in_directives=false}}var f=i.in_directives,p=simple_statement();return f&&p.body instanceof Ot?new I(p.body):p;case"template_head":case"num":case"big_int":case"regexp":case"operator":case"atom":return simple_statement();case"name":if(i.token.value=="async"&&is_token(peek(),"keyword","function")){next();next();if(n){croak("functions are not allowed as the body of a loop")}return o(ie,false,true,e)}if(i.token.value=="import"&&!is_token(peek(),"punc","(")&&!is_token(peek(),"punc",".")){next();var _=import_();semicolon();return _}return is_token(peek(),"punc",":")?labeled_statement():simple_statement();case"punc":switch(i.token.value){case"{":return new L({start:i.token,body:block_(),end:prev()});case"[":case"(":return simple_statement();case";":i.in_directives=false;next();return new B;default:unexpected()}case"keyword":switch(i.token.value){case"break":next();return break_cont(_e);case"continue":next();return break_cont(he);case"debugger":next();semicolon();return new N;case"do":next();var h=in_loop(r);expect_token("keyword","while");var d=parenthesised();semicolon(true);return new H({body:h,condition:d});case"while":next();return new X({condition:parenthesised(),body:in_loop(function(){return r(false,true)})});case"for":next();return for_();case"class":next();if(n){croak("classes are not allowed as the body of a loop")}if(a){croak("classes are not allowed as the body of an if")}return class_(nt);case"function":next();if(n){croak("functions are not allowed as the body of a loop")}return o(ie,false,false,e);case"if":next();return if_();case"return":if(i.in_function==0&&!t.bare_returns)croak("'return' outside of function");next();var m=null;if(is("punc",";")){next()}else if(!can_insert_semicolon()){m=y(true);semicolon()}return new le({value:m});case"switch":next();return new ge({expression:parenthesised(),body:in_loop(switch_body_)});case"throw":next();if(has_newline_before(i.token))croak("Illegal newline after 'throw'");var m=y(true);semicolon();return new fe({value:m});case"try":next();return try_();case"var":next();var _=s();semicolon();return _;case"let":next();var _=c();semicolon();return _;case"const":next();var _=l();semicolon();return _;case"with":if(i.input.has_directive("use strict")){croak("Strict mode may not include a with statement")}next();return new $({expression:parenthesised(),body:r()});case"export":if(!is_token(peek(),"punc","(")){next();var _=export_();if(is("punc",";"))semicolon();return _}}}unexpected()});function labeled_statement(){var e=as_symbol(bt);if(e.name==="await"&&is_in_async()){token_error(i.prev,"await cannot be used as label inside async function")}if(i.labels.some(t=>t.name===e.name)){croak("Label "+e.name+" defined twice")}expect(":");i.labels.push(e);var t=r();i.labels.pop();if(!(t instanceof z)){e.references.forEach(function(t){if(t instanceof he){t=t.label.start;croak("Continue label `"+e.name+"` refers to non-IterationStatement.",t.line,t.col,t.pos)}})}return new K({body:t,label:e})}function simple_statement(e){return new P({body:(e=y(true),semicolon(),e)})}function break_cont(e){var t=null,n;if(!can_insert_semicolon()){t=as_symbol(At,true)}if(t!=null){n=i.labels.find(e=>e.name===t.name);if(!n)croak("Undefined label "+t.name);t.thedef=n}else if(i.in_loop==0)croak(e.TYPE+" not inside a loop or switch");semicolon();var r=new e({label:t});if(n)n.references.push(r);return r}function for_(){var e="`for await` invalid in this context";var t=i.token;if(t.type=="name"&&t.value=="await"){if(!is_in_async()){token_error(t,e)}next()}else{t=false}expect("(");var n=null;if(!is("punc",";")){n=is("keyword","var")?(next(),s(true)):is("keyword","let")?(next(),c(true)):is("keyword","const")?(next(),l(true)):y(true,true);var r=is("operator","in");var a=is("name","of");if(t&&!a){token_error(t,e)}if(r||a){if(n instanceof Ae){if(n.definitions.length>1)token_error(n.start,"Only one variable declaration allowed in for..in loop")}else if(!(is_assignable(n)||(n=to_destructuring(n))instanceof re)){token_error(n.start,"Invalid left-hand side in for..in loop")}next();if(r){return for_in(n)}else{return for_of(n,!!t)}}}else if(t){token_error(t,e)}return regular_for(n)}function regular_for(e){expect(";");var t=is("punc",";")?null:y(true);expect(";");var n=is("punc",")")?null:y(true);expect(")");return new q({init:e,condition:t,step:n,body:in_loop(function(){return r(false,true)})})}function for_of(e,t){var n=e instanceof Ae?e.definitions[0].name:null;var i=y(true);expect(")");return new Y({await:t,init:e,name:n,object:i,body:in_loop(function(){return r(false,true)})})}function for_in(e){var t=y(true);expect(")");return new W({init:e,object:t,body:in_loop(function(){return r(false,true)})})}var a=function(e,t,n){if(has_newline_before(i.token)){croak("Unexpected newline before arrow (=>)")}expect_token("arrow","=>");var r=_function_body(is("punc","{"),false,n);var a=r instanceof Array&&r.length?r[r.length-1].end:r instanceof Array?e:r.end;return new ne({start:e,end:a,async:n,argnames:t,body:r})};var o=function(e,t,n,i){var r=e===ie;var a=is("operator","*");if(a){next()}var o=is("name")?as_symbol(r?pt:dt):null;if(r&&!o){if(i){e=te}else{unexpected()}}if(o&&e!==ee&&!(o instanceof ot))unexpected(prev());var s=[];var u=_function_body(true,a||t,n,o,s);return new e({start:s.start,end:u.end,is_generator:a,async:n,name:o,argnames:s,body:u})};function track_used_binding_identifiers(e,t){var n=new Set;var i=false;var r=false;var a=false;var o=!!t;var s={add_parameter:function(t){if(n.has(t.value)){if(i===false){i=t}s.check_strict()}else{n.add(t.value);if(e){switch(t.value){case"arguments":case"eval":case"yield":if(o){token_error(t,"Unexpected "+t.value+" identifier as parameter inside strict mode")}break;default:if(u.has(t.value)){unexpected()}}}}},mark_default_assignment:function(e){if(r===false){r=e}},mark_spread:function(e){if(a===false){a=e}},mark_strict_mode:function(){o=true},is_strict:function(){return r!==false||a!==false||o},check_strict:function(){if(s.is_strict()&&i!==false){token_error(i,"Parameter "+i.value+" was used already")}}};return s}function parameters(e){var n=track_used_binding_identifiers(true,i.input.has_directive("use strict"));expect("(");while(!is("punc",")")){var r=parameter(n);e.push(r);if(!is("punc",")")){expect(",");if(is("punc",")")&&t.ecma<2017)unexpected()}if(r instanceof Q){break}}next()}function parameter(e,t){var n;var r=false;if(e===undefined){e=track_used_binding_identifiers(true,i.input.has_directive("use strict"))}if(is("expand","...")){r=i.token;e.mark_spread(i.token);next()}n=binding_element(e,t);if(is("operator","=")&&r===false){e.mark_default_assignment(i.token);next();n=new qe({start:n.start,left:n,operator:"=",right:y(false),end:i.token})}if(r!==false){if(!is("punc",")")){unexpected()}n=new Q({start:r,expression:n,end:r})}e.check_strict();return n}function binding_element(e,t){var n=[];var r=true;var a=false;var o;var s=i.token;if(e===undefined){e=track_used_binding_identifiers(false,i.input.has_directive("use strict"))}t=t===undefined?ft:t;if(is("punc","[")){next();while(!is("punc","]")){if(r){r=false}else{expect(",")}if(is("expand","...")){a=true;o=i.token;e.mark_spread(i.token);next()}if(is("punc")){switch(i.token.value){case",":n.push(new Vt({start:i.token,end:i.token}));continue;case"]":break;case"[":case"{":n.push(binding_element(e,t));break;default:unexpected()}}else if(is("name")){e.add_parameter(i.token);n.push(as_symbol(t))}else{croak("Invalid function parameter")}if(is("operator","=")&&a===false){e.mark_default_assignment(i.token);next();n[n.length-1]=new qe({start:n[n.length-1].start,left:n[n.length-1],operator:"=",right:y(false),end:i.token})}if(a){if(!is("punc","]")){croak("Rest element must be last element")}n[n.length-1]=new Q({start:o,expression:n[n.length-1],end:o})}}expect("]");e.check_strict();return new re({start:s,names:n,is_array:true,end:prev()})}else if(is("punc","{")){next();while(!is("punc","}")){if(r){r=false}else{expect(",")}if(is("expand","...")){a=true;o=i.token;e.mark_spread(i.token);next()}if(is("name")&&(is_token(peek(),"punc")||is_token(peek(),"operator"))&&[",","}","="].includes(peek().value)){e.add_parameter(i.token);var u=prev();var c=as_symbol(t);if(a){n.push(new Q({start:o,expression:c,end:c.end}))}else{n.push(new je({start:u,key:c.name,value:c,end:c.end}))}}else if(is("punc","}")){continue}else{var l=i.token;var f=as_property_name();if(f===null){unexpected(prev())}else if(prev().type==="name"&&!is("punc",":")){n.push(new je({start:prev(),key:f,value:new t({start:prev(),name:f,end:prev()}),end:prev()}))}else{expect(":");n.push(new je({start:l,quote:l.quote,key:f,value:binding_element(e,t),end:prev()}))}}if(a){if(!is("punc","}")){croak("Rest element must be last element")}}else if(is("operator","=")){e.mark_default_assignment(i.token);next();n[n.length-1].value=new qe({start:n[n.length-1].value.start,left:n[n.length-1].value,operator:"=",right:y(false),end:i.token})}}expect("}");e.check_strict();return new re({start:s,names:n,is_array:false,end:prev()})}else if(is("name")){e.add_parameter(i.token);return as_symbol(t)}else{croak("Invalid function parameter")}}function params_or_seq_(e,n){var r;var a;var o;var s=[];expect("(");while(!is("punc",")")){if(r)unexpected(r);if(is("expand","...")){r=i.token;if(n)a=i.token;next();s.push(new 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Ot({start:e,end:e,value:e.value,quote:e.quote});break;case"regexp":t=new Rt({start:e,end:e,value:e.value});break;case"atom":switch(e.value){case"false":t=new Ut({start:e,end:e});break;case"true":t=new Kt({start:e,end:e});break;case"null":t=new Nt({start:e,end:e});break}break}next();return t}function to_fun_args(e,t){var n=function(e,t){if(t){return new qe({start:e.start,left:e,operator:"=",right:t,end:t.end})}return e};if(e instanceof Ye){return n(new re({start:e.start,end:e.end,is_array:false,names:e.properties.map(e=>to_fun_args(e))}),t)}else if(e instanceof je){e.value=to_fun_args(e.value);return n(e,t)}else if(e instanceof Vt){return e}else if(e instanceof re){e.names=e.names.map(e=>to_fun_args(e));return n(e,t)}else if(e instanceof yt){return n(new ft({name:e.name,start:e.start,end:e.end}),t)}else if(e instanceof Q){e.expression=to_fun_args(e.expression);return n(e,t)}else if(e instanceof We){return n(new 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p=r.comments_before[0];if(!p.nlb){p.nlb=r.nlb;r.nlb=false}}r.comments_after=l.start.comments_after}l.start=r;var h=prev();if(l.end){h.comments_before=l.end.comments_before;l.end.comments_after.push(...h.comments_after);h.comments_after=l.end.comments_after}l.end=h;if(l instanceof Ne)annotate(l);return m(l,e);case"[":return m(_(),e);case"{":return m(d(),e)}if(!u)unexpected()}if(t&&is("name")&&is_token(peek(),"arrow")){var E=new ft({name:i.token.value,start:r,end:r});next();return a(r,[E],!!u)}if(is("keyword","function")){next();var g=o(te,false,!!u);g.start=r;g.end=prev();return m(g,e)}if(u)return m(u,e);if(is("keyword","class")){next();var v=class_(it);v.start=r;v.end=prev();return m(v,e)}if(is("template_head")){return m(template_string(),e)}if(F.has(i.token.type)){return m(as_atom_node(),e)}unexpected()};function template_string(){var e=[],t=i.token;e.push(new 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c=t;if(n&&e==="static"&&!is("punc","(")){s=true;c=i.token;e=as_property_name()}if(e==="async"&&!is("punc","(")&&!is("punc",",")&&!is("punc","}")&&!is("operator","=")){o=true;c=i.token;e=as_property_name()}if(e===null){u=true;c=i.token;e=as_property_name();if(e===null){unexpected()}}if(is("punc","(")){e=r(e,t);var l=new Je({start:t,static:s,is_generator:u,async:o,key:e,quote:e instanceof _t?c.quote:undefined,value:h(u,o),end:prev()});return l}const f=i.token;if(e=="get"){if(!is("punc")||is("punc","[")){e=r(as_property_name(),t);return new Qe({start:t,static:s,key:e,quote:e instanceof _t?f.quote:undefined,value:h(),end:prev()})}}else if(e=="set"){if(!is("punc")||is("punc","[")){e=r(as_property_name(),t);return new Ze({start:t,static:s,key:e,quote:e instanceof _t?f.quote:undefined,value:h(),end:prev()})}}if(n){const n=a(e);const i=n instanceof ht?c.quote:undefined;if(is("operator","=")){next();return new tt({start:t,static:s,quote:i,key:n,value:y(false),end:prev()})}else if(is("name")||is("punc",";")||is("punc","}")){return new tt({start:t,static:s,quote:i,key:n,end:prev()})}}}function import_(){var e=prev();var t;var n;if(is("name")){t=as_symbol(vt)}if(is("punc",",")){next()}n=map_names(true);if(n||t){expect_token("name","from")}var r=i.token;if(r.type!=="string"){unexpected()}next();return new we({start:e,imported_name:t,imported_names:n,module_name:new Ot({start:r,value:r.value,quote:r.quote,end:r}),end:i.token})}function import_meta(){var e=i.token;expect_token("operator","import");expect_token("punc",".");expect_token("name","meta");return m(new Re({start:e,end:prev()}),false)}function map_name(e){function make_symbol(e){return new e({name:as_property_name(),start:prev(),end:prev()})}var t=e?Dt:St;var n=e?vt:kt;var r=i.token;var a;var o;if(e){a=make_symbol(t)}else{o=make_symbol(n)}if(is("name","as")){next();if(e){o=make_symbol(n)}else{a=make_symbol(t)}}else if(e){o=new n(a)}else{a=new t(o)}return new 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u;if(is("punc","{")||t&&(is("keyword","class")||is("keyword","function"))&&is_token(peek(),"punc")){s=y(false);semicolon()}else if((o=r(t))instanceof Ae&&t){unexpected(o.start)}else if(o instanceof Ae||o instanceof J||o instanceof nt){u=o}else if(o instanceof P){s=o.body}else{unexpected(o.start)}return new Me({start:e,is_default:t,exported_value:s,exported_definition:u,end:prev()})}function as_property_name(){var e=i.token;switch(e.type){case"punc":if(e.value==="["){next();var t=y(false);expect("]");return t}else unexpected(e);case"operator":if(e.value==="*"){next();return null}if(!["delete","in","instanceof","new","typeof","void"].includes(e.value)){unexpected(e)}case"name":case"string":case"num":case"big_int":case"keyword":case"atom":next();return e.value;default:unexpected(e)}}function as_name(){var e=i.token;if(e.type!="name")unexpected();next();return e.value}function _make_symbol(e){var t=i.token.value;return 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Q({start:my_start_token(e),end:my_end_token(e),expression:from_moz(e.argument)})},TemplateElement:function(e){return new se({start:my_start_token(e),end:my_end_token(e),value:e.value.cooked,raw:e.value.raw})},TemplateLiteral:function(e){var t=[];for(var n=0;n<e.quasis.length;n++){t.push(from_moz(e.quasis[n]));if(e.expressions[n]){t.push(from_moz(e.expressions[n]))}}return new oe({start:my_start_token(e),end:my_end_token(e),segments:t})},TaggedTemplateExpression:function(e){return new ae({start:my_start_token(e),end:my_end_token(e),template_string:from_moz(e.quasi),prefix:from_moz(e.tag)})},FunctionDeclaration:function(t){return new ie({start:my_start_token(t),end:my_end_token(t),name:from_moz(t.id),argnames:t.params.map(from_moz),is_generator:t.generator,async:t.async,body:e(from_moz(t.body).body)})},FunctionExpression:function(t){return new te({start:my_start_token(t),end:my_end_token(t),name:from_moz(t.id),argnames:t.params.map(from_moz),is_generator:t.generator,async:t.async,body:e(from_moz(t.body).body)})},ArrowFunctionExpression:function(e){const t=e.body.type==="BlockStatement"?from_moz(e.body).body:[make_node(le,{},{value:from_moz(e.body)})];return new ne({start:my_start_token(e),end:my_end_token(e),argnames:e.params.map(from_moz),body:t,async:e.async})},ExpressionStatement:function(e){return new P({start:my_start_token(e),end:my_end_token(e),body:from_moz(e.expression)})},TryStatement:function(e){var t=e.handlers||[e.handler];if(t.length>1||e.guardedHandlers&&e.guardedHandlers.length){throw new Error("Multiple catch clauses are not supported.")}return new ye({start:my_start_token(e),end:my_end_token(e),body:from_moz(e.block).body,bcatch:from_moz(t[0]),bfinally:e.finalizer?new Se(from_moz(e.finalizer)):null})},Property:function(e){var t=e.key;var 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new(e.computed?Be:Le)({start:my_start_token(e),end:my_end_token(e),property:e.computed?from_moz(e.property):e.property.name,expression:from_moz(e.object)})},SwitchCase:function(e){return new(e.test?be:De)({start:my_start_token(e),end:my_end_token(e),expression:from_moz(e.test),body:e.consequent.map(from_moz)})},VariableDeclaration:function(e){return new(e.kind==="const"?xe:e.kind==="let"?Ce:Te)({start:my_start_token(e),end:my_end_token(e),definitions:e.declarations.map(from_moz)})},ImportDeclaration:function(e){var t=null;var n=null;e.specifiers.forEach(function(e){if(e.type==="ImportSpecifier"){if(!n){n=[]}n.push(new Fe({start:my_start_token(e),end:my_end_token(e),foreign_name:from_moz(e.imported),name:from_moz(e.local)}))}else if(e.type==="ImportDefaultSpecifier"){t=from_moz(e.local)}else if(e.type==="ImportNamespaceSpecifier"){if(!n){n=[]}n.push(new Fe({start:my_start_token(e),end:my_end_token(e),foreign_name:new Dt({name:"*"}),name:from_moz(e.local)}))}});return new we({start:my_start_token(e),end:my_end_token(e),imported_name:t,imported_names:n,module_name:from_moz(e.source)})},ExportAllDeclaration:function(e){return new Me({start:my_start_token(e),end:my_end_token(e),exported_names:[new Fe({name:new St({name:"*"}),foreign_name:new St({name:"*"})})],module_name:from_moz(e.source)})},ExportNamedDeclaration:function(e){return new Me({start:my_start_token(e),end:my_end_token(e),exported_definition:from_moz(e.declaration),exported_names:e.specifiers&&e.specifiers.length?e.specifiers.map(function(e){return new Fe({foreign_name:from_moz(e.exported),name:from_moz(e.local)})}):null,module_name:from_moz(e.source)})},ExportDefaultDeclaration:function(e){return new Me({start:my_start_token(e),end:my_end_token(e),exported_value:from_moz(e.declaration),is_default:true})},Literal:function(e){var t=e.value,n={start:my_start_token(e),end:my_end_token(e)};var i=e.regex;if(i&&i.pattern){n.value={source:i.pattern,flags:i.flags};return new Rt(n)}else if(i){const 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body>body");map("ForInStatement",W,"left>init, right>object, body>body");map("ForOfStatement",Y,"left>init, right>object, body>body, await=await");map("AwaitExpression",de,"argument>expression");map("YieldExpression",me,"argument>expression, delegate=is_star");map("DebuggerStatement",N);map("VariableDeclarator",Oe,"id>name, init>value");map("CatchClause",ke,"param>argname, body%body");map("ThisExpression",Tt);map("Super",Ct);map("BinaryExpression",Ge,"operator=operator, left>left, right>right");map("LogicalExpression",Ge,"operator=operator, left>left, right>right");map("AssignmentExpression",Xe,"operator=operator, left>left, right>right");map("ConditionalExpression",He,"test>condition, consequent>consequent, alternate>alternative");map("NewExpression",Ie,"callee>expression, arguments@args");map("CallExpression",Ne,"callee>expression, arguments@args");def_to_moz(Z,function To_Moz_Program(e){return to_moz_scope("Program",e)});def_to_moz(Q,function 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n=t.is_generator!==undefined?t.is_generator:e.is_generator;return{type:"FunctionExpression",id:to_moz(e.name),params:e.argnames.map(to_moz),generator:n,async:e.async,body:to_moz_scope("BlockStatement",e)}});def_to_moz(ne,function To_Moz_ArrowFunctionExpression(e){var t={type:"BlockStatement",body:e.body.map(to_moz)};return{type:"ArrowFunctionExpression",params:e.argnames.map(to_moz),async:e.async,body:t}});def_to_moz(re,function To_Moz_ObjectPattern(e){if(e.is_array){return{type:"ArrayPattern",elements:e.names.map(to_moz)}}return{type:"ObjectPattern",properties:e.names.map(to_moz)}});def_to_moz(I,function To_Moz_Directive(e){return{type:"ExpressionStatement",expression:{type:"Literal",value:e.value,raw:e.print_to_string()},directive:e.value}});def_to_moz(P,function To_Moz_ExpressionStatement(e){return{type:"ExpressionStatement",expression:to_moz(e.body)}});def_to_moz(ve,function To_Moz_SwitchCase(e){return{type:"SwitchCase",test:to_moz(e.expression),consequent:e.body.map(to_moz)}});def_to_moz(ye,function To_Moz_TryStatement(e){return{type:"TryStatement",block:to_moz_block(e),handler:to_moz(e.bcatch),guardedHandlers:[],finalizer:to_moz(e.bfinally)}});def_to_moz(ke,function To_Moz_CatchClause(e){return{type:"CatchClause",param:to_moz(e.argname),guard:null,body:to_moz_block(e)}});def_to_moz(Ae,function To_Moz_VariableDeclaration(e){return{type:"VariableDeclaration",kind:e instanceof xe?"const":e instanceof Ce?"let":"var",declarations:e.definitions.map(to_moz)}});def_to_moz(Me,function To_Moz_ExportDeclaration(e){if(e.exported_names){if(e.exported_names[0].name.name==="*"){return{type:"ExportAllDeclaration",source:to_moz(e.module_name)}}return{type:"ExportNamedDeclaration",specifiers:e.exported_names.map(function(e){return{type:"ExportSpecifier",exported:to_moz(e.foreign_name),local:to_moz(e.name)}}),declaration:to_moz(e.exported_definition),source:to_moz(e.module_name)}}return{type:e.is_default?"ExportDefaultDeclaration":"ExportNamedDeclaration",declaration:to_moz(e.exported_value||e.exported_definition)}});def_to_moz(we,function To_Moz_ImportDeclaration(e){var t=[];if(e.imported_name){t.push({type:"ImportDefaultSpecifier",local:to_moz(e.imported_name)})}if(e.imported_names&&e.imported_names[0].foreign_name.name==="*"){t.push({type:"ImportNamespaceSpecifier",local:to_moz(e.imported_names[0].name)})}else if(e.imported_names){e.imported_names.forEach(function(e){t.push({type:"ImportSpecifier",local:to_moz(e.name),imported:to_moz(e.foreign_name)})})}return{type:"ImportDeclaration",specifiers:t,source:to_moz(e.module_name)}});def_to_moz(Re,function To_Moz_MetaProperty(){return{type:"MetaProperty",meta:{type:"Identifier",name:"import"},property:{type:"Identifier",name:"meta"}}});def_to_moz(Pe,function To_Moz_SequenceExpression(e){return{type:"SequenceExpression",expressions:e.expressions.map(to_moz)}});def_to_moz(Ve,function To_Moz_MemberExpression(e){var t=e instanceof Be;return{type:"MemberExpression",object:to_moz(e.expression),computed:t,property:t?to_moz(e.property):{type:"Identifier",name:e.property}}});def_to_moz(Ue,function To_Moz_Unary(e){return{type:e.operator=="++"||e.operator=="--"?"UpdateExpression":"UnaryExpression",operator:e.operator,prefix:e instanceof Ke,argument:to_moz(e.expression)}});def_to_moz(Ge,function To_Moz_BinaryExpression(e){if(e.operator=="="&&to_moz_in_destructuring()){return{type:"AssignmentPattern",left:to_moz(e.left),right:to_moz(e.right)}}const t=e.operator=="&&"||e.operator=="||"||e.operator==="??"?"LogicalExpression":"BinaryExpression";return{type:t,left:to_moz(e.left),operator:e.operator,right:to_moz(e.right)}});def_to_moz(We,function To_Moz_ArrayExpression(e){return{type:"ArrayExpression",elements:e.elements.map(to_moz)}});def_to_moz(Ye,function To_Moz_ObjectExpression(e){return{type:"ObjectExpression",properties:e.properties.map(to_moz)}});def_to_moz($e,function To_Moz_Property(e,t){var n=e.key instanceof R?to_moz(e.key):{type:"Identifier",value:e.key};if(typeof e.key==="number"){n={type:"Literal",value:Number(e.key)}}if(typeof e.key==="string"){n={type:"Identifier",name:e.key}}var i;var r=typeof e.key==="string"||typeof e.key==="number";var a=r?false:!(e.key instanceof rt)||e.key instanceof yt;if(e instanceof je){i="init";a=!r}else if(e instanceof Qe){i="get"}else if(e instanceof Ze){i="set"}if(e instanceof tt){return{type:"FieldDefinition",computed:a,key:n,value:to_moz(e.value),static:e.static}}if(t instanceof et){return{type:"MethodDefinition",computed:a,kind:i,static:e.static,key:to_moz(e.key),value:to_moz(e.value)}}return{type:"Property",computed:a,kind:i,key:n,value:to_moz(e.value)}});def_to_moz(Je,function To_Moz_MethodDefinition(e,t){if(t instanceof Ye){return{type:"Property",computed:!(e.key instanceof rt)||e.key instanceof yt,kind:"init",method:true,shorthand:false,key:to_moz(e.key),value:to_moz(e.value)}}return{type:"MethodDefinition",computed:!(e.key instanceof rt)||e.key instanceof yt,kind:e.key==="constructor"?"constructor":"method",static:e.static,key:to_moz(e.key),value:to_moz(e.value)}});def_to_moz(et,function To_Moz_Class(e){var t=e instanceof it?"ClassExpression":"ClassDeclaration";return{type:t,superClass:to_moz(e.extends),id:e.name?to_moz(e.name):null,body:{type:"ClassBody",body:e.properties.map(to_moz)}}});def_to_moz(at,function To_Moz_MetaProperty(){return{type:"MetaProperty",meta:{type:"Identifier",name:"new"},property:{type:"Identifier",name:"target"}}});def_to_moz(rt,function To_Moz_Identifier(e,t){if(e instanceof _t&&t.quote){return{type:"Literal",value:e.name}}var n=e.definition();return{type:"Identifier",name:n?n.mangled_name||n.name:e.name}});def_to_moz(Rt,function To_Moz_RegExpLiteral(e){const t=e.value.source;const n=e.value.flags;return{type:"Literal",value:null,raw:e.print_to_string(),regex:{pattern:t,flags:n}}});def_to_moz(xt,function To_Moz_Literal(e){var t=e.value;if(typeof t==="number"&&(t<0||t===0&&1/t<0)){return{type:"UnaryExpression",operator:"-",prefix:true,argument:{type:"Literal",value:-t,raw:e.start.raw}}}return{type:"Literal",value:t,raw:e.start.raw}});def_to_moz(Mt,function To_Moz_Atom(e){return{type:"Identifier",name:String(e.value)}});def_to_moz(wt,e=>({type:"BigIntLiteral",value:e.value}));Bt.DEFMETHOD("to_mozilla_ast",xt.prototype.to_mozilla_ast);Nt.DEFMETHOD("to_mozilla_ast",xt.prototype.to_mozilla_ast);Vt.DEFMETHOD("to_mozilla_ast",function To_Moz_ArrayHole(){return null});V.DEFMETHOD("to_mozilla_ast",L.prototype.to_mozilla_ast);J.DEFMETHOD("to_mozilla_ast",te.prototype.to_mozilla_ast);function raw_token(e){if(e.type=="Literal"){return e.raw!=null?e.raw:e.value+""}}function my_start_token(e){var t=e.loc,n=t&&t.start;var i=e.range;return new w({file:t&&t.source,line:n&&n.line,col:n&&n.column,pos:i?i[0]:e.start,endline:n&&n.line,endcol:n&&n.column,endpos:i?i[0]:e.start,raw:raw_token(e)})}function my_end_token(e){var t=e.loc,n=t&&t.end;var i=e.range;return new w({file:t&&t.source,line:n&&n.line,col:n&&n.column,pos:i?i[1]:e.end,endline:n&&n.line,endcol:n&&n.column,endpos:i?i[1]:e.end,raw:raw_token(e)})}function map(e,n,i){var r="function From_Moz_"+e+"(M){\n";r+="return new U2."+n.name+"({\n"+"start: my_start_token(M),\n"+"end: my_end_token(M)";var a="function To_Moz_"+e+"(M){\n";a+="return {\n"+"type: "+JSON.stringify(e);if(i)i.split(/\s*,\s*/).forEach(function(e){var t=/([a-z0-9$_]+)([=@>%])([a-z0-9$_]+)/i.exec(e);if(!t)throw new Error("Can't understand property map: "+e);var n=t[1],i=t[2],o=t[3];r+=",\n"+o+": ";a+=",\n"+n+": ";switch(i){case"@":r+="M."+n+".map(from_moz)";a+="M."+o+".map(to_moz)";break;case">":r+="from_moz(M."+n+")";a+="to_moz(M."+o+")";break;case"=":r+="M."+n;a+="M."+o;break;case"%":r+="from_moz(M."+n+").body";a+="to_moz_block(M)";break;default:throw new Error("Can't understand operator in propmap: "+e)}});r+="\n})\n}";a+="\n}\n}";r=new Function("U2","my_start_token","my_end_token","from_moz","return("+r+")")(qt,my_start_token,my_end_token,from_moz);a=new Function("to_moz","to_moz_block","to_moz_scope","return("+a+")")(to_moz,to_moz_block,to_moz_scope);t[e]=r;def_to_moz(n,a)}var n=null;function from_moz(e){n.push(e);var i=e!=null?t[e.type](e):null;n.pop();return i}R.from_mozilla_ast=function(e){var t=n;n=[];var i=from_moz(e);n=t;return i};function set_moz_loc(e,t){var n=e.start;var i=e.end;if(!(n&&i)){return t}if(n.pos!=null&&i.endpos!=null){t.range=[n.pos,i.endpos]}if(n.line){t.loc={start:{line:n.line,column:n.col},end:i.endline?{line:i.endline,column:i.endcol}:null};if(n.file){t.loc.source=n.file}}return t}function def_to_moz(e,t){e.DEFMETHOD("to_mozilla_ast",function(e){return set_moz_loc(this,t(this,e))})}var i=null;function to_moz(e){if(i===null){i=[]}i.push(e);var t=e!=null?e.to_mozilla_ast(i[i.length-2]):null;i.pop();if(i.length===0){i=null}return t}function to_moz_in_destructuring(){var e=i.length;while(e--){if(i[e]instanceof re){return true}}return false}function to_moz_block(e){return{type:"BlockStatement",body:e.body.map(to_moz)}}function to_moz_scope(e,t){var n=t.body.map(to_moz);if(t.body[0]instanceof P&&t.body[0].body instanceof Ot){n.unshift(to_moz(new B(t.body[0])))}return{type:e,body:n}}})();function first_in_statement(e){let t=e.parent(-1);for(let n=0,i;i=e.parent(n);n++){if(i instanceof M&&i.body===t)return true;if(i instanceof Pe&&i.expressions[0]===t||i.TYPE==="Call"&&i.expression===t||i instanceof ae&&i.prefix===t||i instanceof Le&&i.expression===t||i instanceof Be&&i.expression===t||i instanceof He&&i.condition===t||i instanceof Ge&&i.left===t||i instanceof ze&&i.expression===t){t=i}else{return false}}}function left_is_object(e){if(e instanceof Ye)return true;if(e instanceof Pe)return left_is_object(e.expressions[0]);if(e.TYPE==="Call")return left_is_object(e.expression);if(e instanceof ae)return left_is_object(e.prefix);if(e instanceof Le||e instanceof Be)return left_is_object(e.expression);if(e instanceof He)return left_is_object(e.condition);if(e instanceof Ge)return left_is_object(e.left);if(e instanceof ze)return left_is_object(e.expression);return false}const Wt=/^$|[;{][\s\n]*$/;const Yt=10;const $t=32;const jt=/[@#]__(PURE|INLINE|NOINLINE)__/g;function is_some_comments(e){return(e.type==="comment2"||e.type==="comment1")&&/@preserve|@lic|@cc_on|^\**!/i.test(e.value)}function OutputStream(e){var t=!e;e=defaults(e,{ascii_only:false,beautify:false,braces:false,comments:"some",ecma:5,ie8:false,indent_level:4,indent_start:0,inline_script:true,keep_numbers:false,keep_quoted_props:false,max_line_len:false,preamble:null,preserve_annotations:false,quote_keys:false,quote_style:0,safari10:false,semicolons:true,shebang:true,shorthand:undefined,source_map:null,webkit:false,width:80,wrap_iife:false,wrap_func_args:true},true);if(e.shorthand===undefined)e.shorthand=e.ecma>5;var n=return_false;if(e.comments){let t=e.comments;if(typeof e.comments==="string"&&/^\/.*\/[a-zA-Z]*$/.test(e.comments)){var i=e.comments.lastIndexOf("/");t=new RegExp(e.comments.substr(1,i-1),e.comments.substr(i+1))}if(t instanceof RegExp){n=function(e){return e.type!="comment5"&&t.test(e.value)}}else if(typeof t==="function"){n=function(e){return e.type!="comment5"&&t(this,e)}}else if(t==="some"){n=is_some_comments}else{n=return_true}}var r=0;var a=0;var o=1;var s=0;var u="";let c=new Set;var l=e.ascii_only?function(t,n){if(e.ecma>=2015){t=t.replace(/[\ud800-\udbff][\udc00-\udfff]/g,function(e){var t=get_full_char_code(e,0).toString(16);return"\\u{"+t+"}"})}return t.replace(/[\u0000-\u001f\u007f-\uffff]/g,function(e){var t=e.charCodeAt(0).toString(16);if(t.length<=2&&!n){while(t.length<2)t="0"+t;return"\\x"+t}else{while(t.length<4)t="0"+t;return"\\u"+t}})}:function(e){return e.replace(/[\ud800-\udbff][\udc00-\udfff]|([\ud800-\udbff]|[\udc00-\udfff])/g,function(e,t){if(t){return"\\u"+t.charCodeAt(0).toString(16)}return e})};function make_string(t,n){var i=0,r=0;t=t.replace(/[\\\b\f\n\r\v\t\x22\x27\u2028\u2029\0\ufeff]/g,function(n,a){switch(n){case'"':++i;return'"';case"'":++r;return"'";case"\\":return"\\\\";case"\n":return"\\n";case"\r":return"\\r";case"\t":return"\\t";case"\b":return"\\b";case"\f":return"\\f";case"\v":return e.ie8?"\\x0B":"\\v";case"\u2028":return"\\u2028";case"\u2029":return"\\u2029";case"\ufeff":return"\\ufeff";case"\0":return/[0-9]/.test(get_full_char(t,a+1))?"\\x00":"\\0"}return n});function quote_single(){return"'"+t.replace(/\x27/g,"\\'")+"'"}function quote_double(){return'"'+t.replace(/\x22/g,'\\"')+'"'}function quote_template(){return"`"+t.replace(/`/g,"\\`")+"`"}t=l(t);if(n==="`")return quote_template();switch(e.quote_style){case 1:return quote_single();case 2:return quote_double();case 3:return n=="'"?quote_single():quote_double();default:return i>r?quote_single():quote_double()}}function encode_string(t,n){var i=make_string(t,n);if(e.inline_script){i=i.replace(/<\x2f(script)([>\/\t\n\f\r ])/gi,"<\\/$1$2");i=i.replace(/\x3c!--/g,"\\x3c!--");i=i.replace(/--\x3e/g,"--\\x3e")}return i}function make_name(e){e=e.toString();e=l(e,true);return e}function make_indent(t){return" ".repeat(e.indent_start+r-t*e.indent_level)}var f=false;var p=false;var _=false;var h=0;var d=false;var m=false;var E=-1;var g="";var v,D,b=e.source_map&&[];var y=b?function(){b.forEach(function(t){try{e.source_map.add(t.token.file,t.line,t.col,t.token.line,t.token.col,!t.name&&t.token.type=="name"?t.token.value:t.name)}catch(e){}});b=[]}:noop;var k=e.max_line_len?function(){if(a>e.max_line_len){if(h){var t=u.slice(0,h);var n=u.slice(h);if(b){var i=n.length-a;b.forEach(function(e){e.line++;e.col+=i})}u=t+"\n"+n;o++;s++;a=n.length}}if(h){h=0;y()}}:noop;var S=makePredicate("( [ + * / - , . `");function print(t){t=String(t);var n=get_full_char(t,0);if(d&&n){d=false;if(n!=="\n"){print("\n");C()}}if(m&&n){m=false;if(!/[\s;})]/.test(n)){T()}}E=-1;var i=g.charAt(g.length-1);if(_){_=false;if(i===":"&&n==="}"||(!n||!";}".includes(n))&&i!==";"){if(e.semicolons||S.has(n)){u+=";";a++;s++}else{k();if(a>0){u+="\n";s++;o++;a=0}if(/^\s+$/.test(t)){_=true}}if(!e.beautify)p=false}}if(p){if(is_identifier_char(i)&&(is_identifier_char(n)||n=="\\")||n=="/"&&n==i||(n=="+"||n=="-")&&n==g){u+=" ";a++;s++}p=false}if(v){b.push({token:v,name:D,line:o,col:a});v=false;if(!h)y()}u+=t;f=t[t.length-1]=="(";s+=t.length;var r=t.split(/\r?\n/),c=r.length-1;o+=c;a+=r[0].length;if(c>0){k();a=r[c].length}g=t}var A=function(){print("*")};var T=e.beautify?function(){print(" ")}:function(){p=true};var C=e.beautify?function(t){if(e.beautify){print(make_indent(t?.5:0))}}:noop;var x=e.beautify?function(e,t){if(e===true)e=next_indent();var n=r;r=e;var i=t();r=n;return i}:function(e,t){return t()};var O=e.beautify?function(){if(E<0)return print("\n");if(u[E]!="\n"){u=u.slice(0,E)+"\n"+u.slice(E);s++;o++}E++}:e.max_line_len?function(){k();h=u.length}:noop;var F=e.beautify?function(){print(";")}:function(){_=true};function force_semicolon(){_=false;print(";")}function next_indent(){return r+e.indent_level}function with_block(e){var t;print("{");O();x(next_indent(),function(){t=e()});C();print("}");return t}function with_parens(e){print("(");var t=e();print(")");return t}function with_square(e){print("[");var t=e();print("]");return t}function comma(){print(",");T()}function colon(){print(":");T()}var w=b?function(e,t){v=e;D=t}:noop;function get(){if(h){k()}return u}function has_nlb(){let e=u.length-1;while(e>=0){const t=u.charCodeAt(e);if(t===Yt){return true}if(t!==$t){return false}e--}return true}function filter_comment(t){if(!e.preserve_annotations){t=t.replace(jt," ")}if(/^\s*$/.test(t)){return""}return t.replace(/(<\s*\/\s*)(script)/i,"<\\/$2")}function prepend_comments(t){var i=this;var r=t.start;if(!r)return;var a=i.printed_comments;const o=t instanceof ce&&t.value;if(r.comments_before&&a.has(r.comments_before)){if(o){r.comments_before=[]}else{return}}var u=r.comments_before;if(!u){u=r.comments_before=[]}a.add(u);if(o){var c=new TreeWalker(function(e){var t=c.parent();if(t instanceof ce||t instanceof Ge&&t.left===e||t.TYPE=="Call"&&t.expression===e||t instanceof He&&t.condition===e||t instanceof Le&&t.expression===e||t instanceof Pe&&t.expressions[0]===e||t instanceof Be&&t.expression===e||t instanceof ze){if(!e.start)return;var n=e.start.comments_before;if(n&&!a.has(n)){a.add(n);u=u.concat(n)}}else{return true}});c.push(t);t.value.walk(c)}if(s==0){if(u.length>0&&e.shebang&&u[0].type==="comment5"&&!a.has(u[0])){print("#!"+u.shift().value+"\n");C()}var l=e.preamble;if(l){print(l.replace(/\r\n?|[\n\u2028\u2029]|\s*$/g,"\n"))}}u=u.filter(n,t).filter(e=>!a.has(e));if(u.length==0)return;var f=has_nlb();u.forEach(function(e,t){a.add(e);if(!f){if(e.nlb){print("\n");C();f=true}else if(t>0){T()}}if(/comment[134]/.test(e.type)){var n=filter_comment(e.value);if(n){print("//"+n+"\n");C()}f=true}else if(e.type=="comment2"){var n=filter_comment(e.value);if(n){print("/*"+n+"*/")}f=false}});if(!f){if(r.nlb){print("\n");C()}else{T()}}}function append_comments(e,t){var i=this;var r=e.end;if(!r)return;var a=i.printed_comments;var o=r[t?"comments_before":"comments_after"];if(!o||a.has(o))return;if(!(e instanceof M||o.every(e=>!/comment[134]/.test(e.type))))return;a.add(o);var s=u.length;o.filter(n,e).forEach(function(e,n){if(a.has(e))return;a.add(e);m=false;if(d){print("\n");C();d=false}else if(e.nlb&&(n>0||!has_nlb())){print("\n");C()}else if(n>0||!t){T()}if(/comment[134]/.test(e.type)){const t=filter_comment(e.value);if(t){print("//"+t)}d=true}else if(e.type=="comment2"){const t=filter_comment(e.value);if(t){print("/*"+t+"*/")}m=true}});if(u.length>s)E=s}var R=[];return{get:get,toString:get,indent:C,in_directive:false,use_asm:null,active_scope:null,indentation:function(){return r},current_width:function(){return a-r},should_break:function(){return e.width&&this.current_width()>=e.width},has_parens:function(){return f},newline:O,print:print,star:A,space:T,comma:comma,colon:colon,last:function(){return g},semicolon:F,force_semicolon:force_semicolon,to_utf8:l,print_name:function(e){print(make_name(e))},print_string:function(e,t,n){var i=encode_string(e,t);if(n===true&&!i.includes("\\")){if(!Wt.test(u)){force_semicolon()}force_semicolon()}print(i)},print_template_string_chars:function(e){var t=encode_string(e,"`").replace(/\${/g,"\\${");return print(t.substr(1,t.length-2))},encode_string:encode_string,next_indent:next_indent,with_indent:x,with_block:with_block,with_parens:with_parens,with_square:with_square,add_mapping:w,option:function(t){return e[t]},printed_comments:c,prepend_comments:t?noop:prepend_comments,append_comments:t||n===return_false?noop:append_comments,line:function(){return o},col:function(){return a},pos:function(){return s},push_node:function(e){R.push(e)},pop_node:function(){return R.pop()},parent:function(e){return R[R.length-2-(e||0)]}}}(function(){function DEFPRINT(e,t){e.DEFMETHOD("_codegen",t)}R.DEFMETHOD("print",function(e,t){var n=this,i=n._codegen;if(n instanceof j){e.active_scope=n}else if(!e.use_asm&&n instanceof I&&n.value=="use asm"){e.use_asm=e.active_scope}function doit(){e.prepend_comments(n);n.add_source_map(e);i(n,e);e.append_comments(n)}e.push_node(n);if(t||n.needs_parens(e)){e.with_parens(doit)}else{doit()}e.pop_node();if(n===e.use_asm){e.use_asm=null}});R.DEFMETHOD("_print",R.prototype.print);R.DEFMETHOD("print_to_string",function(e){var t=OutputStream(e);this.print(t);return t.get()});function PARENS(e,t){if(Array.isArray(e)){e.forEach(function(e){PARENS(e,t)})}else{e.DEFMETHOD("needs_parens",t)}}PARENS(R,return_false);PARENS(te,function(e){if(!e.has_parens()&&first_in_statement(e)){return true}if(e.option("webkit")){var t=e.parent();if(t instanceof Ve&&t.expression===this){return true}}if(e.option("wrap_iife")){var t=e.parent();if(t instanceof Ne&&t.expression===this){return true}}if(e.option("wrap_func_args")){var t=e.parent();if(t instanceof Ne&&t.args.includes(this)){return true}}return false});PARENS(ne,function(e){var t=e.parent();return t instanceof Ve&&t.expression===this});PARENS(Ye,function(e){return!e.has_parens()&&first_in_statement(e)});PARENS(it,first_in_statement);PARENS(Ue,function(e){var t=e.parent();return t instanceof Ve&&t.expression===this||t instanceof Ne&&t.expression===this||t instanceof Ge&&t.operator==="**"&&this instanceof Ke&&t.left===this&&this.operator!=="++"&&this.operator!=="--"});PARENS(de,function(e){var t=e.parent();return t instanceof Ve&&t.expression===this||t instanceof Ne&&t.expression===this||e.option("safari10")&&t instanceof Ke});PARENS(Pe,function(e){var t=e.parent();return t instanceof Ne||t instanceof Ue||t instanceof Ge||t instanceof Oe||t instanceof Ve||t instanceof We||t instanceof $e||t instanceof He||t instanceof ne||t instanceof qe||t instanceof Q||t instanceof Y&&this===t.object||t instanceof me||t instanceof Me});PARENS(Ge,function(e){var t=e.parent();if(t instanceof Ne&&t.expression===this)return true;if(t instanceof Ue)return true;if(t instanceof Ve&&t.expression===this)return true;if(t instanceof Ge){const e=t.operator;const n=this.operator;if(n==="??"&&(e==="||"||e==="&&")){return true}const i=O[e];const r=O[n];if(i>r||i==r&&(this===t.right||e=="**")){return true}}});PARENS(me,function(e){var t=e.parent();if(t instanceof Ge&&t.operator!=="=")return true;if(t instanceof Ne&&t.expression===this)return true;if(t instanceof He&&t.condition===this)return true;if(t instanceof Ue)return true;if(t instanceof Ve&&t.expression===this)return true});PARENS(Ve,function(e){var t=e.parent();if(t instanceof Ie&&t.expression===this){return walk(this,e=>{if(e instanceof j)return true;if(e instanceof Ne){return zt}})}});PARENS(Ne,function(e){var t=e.parent(),n;if(t instanceof Ie&&t.expression===this||t instanceof Me&&t.is_default&&this.expression instanceof te)return true;return this.expression instanceof te&&t instanceof Ve&&t.expression===this&&(n=e.parent(1))instanceof Xe&&n.left===t});PARENS(Ie,function(e){var t=e.parent();if(this.args.length===0&&(t instanceof Ve||t instanceof Ne&&t.expression===this))return true});PARENS(Ft,function(e){var t=e.parent();if(t instanceof Ve&&t.expression===this){var n=this.getValue();if(n<0||/^0/.test(make_num(n))){return true}}});PARENS(wt,function(e){var t=e.parent();if(t instanceof Ve&&t.expression===this){var n=this.getValue();if(n.startsWith("-")){return true}}});PARENS([Xe,He],function(e){var t=e.parent();if(t instanceof Ue)return true;if(t instanceof Ge&&!(t instanceof Xe))return true;if(t instanceof Ne&&t.expression===this)return true;if(t instanceof He&&t.condition===this)return true;if(t instanceof Ve&&t.expression===this)return true;if(this instanceof Xe&&this.left instanceof re&&this.left.is_array===false)return true});DEFPRINT(I,function(e,t){t.print_string(e.value,e.quote);t.semicolon()});DEFPRINT(Q,function(e,t){t.print("...");e.expression.print(t)});DEFPRINT(re,function(e,t){t.print(e.is_array?"[":"{");var n=e.names.length;e.names.forEach(function(e,i){if(i>0)t.comma();e.print(t);if(i==n-1&&e instanceof Vt)t.comma()});t.print(e.is_array?"]":"}")});DEFPRINT(N,function(e,t){t.print("debugger");t.semicolon()});function display_body(e,t,n,i){var r=e.length-1;n.in_directive=i;e.forEach(function(e,i){if(n.in_directive===true&&!(e instanceof I||e instanceof B||e instanceof P&&e.body instanceof Ot)){n.in_directive=false}if(!(e instanceof B)){n.indent();e.print(n);if(!(i==r&&t)){n.newline();if(t)n.newline()}}if(n.in_directive===true&&e instanceof P&&e.body instanceof Ot){n.in_directive=false}});n.in_directive=false}U.DEFMETHOD("_do_print_body",function(e){force_statement(this.body,e)});DEFPRINT(M,function(e,t){e.body.print(t);t.semicolon()});DEFPRINT(Z,function(e,t){display_body(e.body,true,t,true);t.print("")});DEFPRINT(K,function(e,t){e.label.print(t);t.colon();e.body.print(t)});DEFPRINT(P,function(e,t){e.body.print(t);t.semicolon()});function print_braced_empty(e,t){t.print("{");t.with_indent(t.next_indent(),function(){t.append_comments(e,true)});t.print("}")}function print_braced(e,t,n){if(e.body.length>0){t.with_block(function(){display_body(e.body,false,t,n)})}else print_braced_empty(e,t)}DEFPRINT(L,function(e,t){print_braced(e,t)});DEFPRINT(B,function(e,t){t.semicolon()});DEFPRINT(H,function(e,t){t.print("do");t.space();make_block(e.body,t);t.space();t.print("while");t.space();t.with_parens(function(){e.condition.print(t)});t.semicolon()});DEFPRINT(X,function(e,t){t.print("while");t.space();t.with_parens(function(){e.condition.print(t)});t.space();e._do_print_body(t)});DEFPRINT(q,function(e,t){t.print("for");t.space();t.with_parens(function(){if(e.init){if(e.init instanceof Ae){e.init.print(t)}else{parenthesize_for_noin(e.init,t,true)}t.print(";");t.space()}else{t.print(";")}if(e.condition){e.condition.print(t);t.print(";");t.space()}else{t.print(";")}if(e.step){e.step.print(t)}});t.space();e._do_print_body(t)});DEFPRINT(W,function(e,t){t.print("for");if(e.await){t.space();t.print("await")}t.space();t.with_parens(function(){e.init.print(t);t.space();t.print(e instanceof 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instanceof Ee){if(!n.alternative){make_block(e.body,t);return}n=n.alternative}else if(n instanceof U){n=n.body}else break}force_statement(e.body,t)}DEFPRINT(Ee,function(e,t){t.print("if");t.space();t.with_parens(function(){e.condition.print(t)});t.space();if(e.alternative){make_then(e,t);t.space();t.print("else");t.space();if(e.alternative instanceof Ee)e.alternative.print(t);else force_statement(e.alternative,t)}else{e._do_print_body(t)}});DEFPRINT(ge,function(e,t){t.print("switch");t.space();t.with_parens(function(){e.expression.print(t)});t.space();var n=e.body.length-1;if(n<0)print_braced_empty(e,t);else t.with_block(function(){e.body.forEach(function(e,i){t.indent(true);e.print(t);if(i<n&&e.body.length>0)t.newline()})})});ve.DEFMETHOD("_do_print_body",function(e){e.newline();this.body.forEach(function(t){e.indent();t.print(e);e.newline()})});DEFPRINT(De,function(e,t){t.print("default:");e._do_print_body(t)});DEFPRINT(be,function(e,t){t.print("case");t.space();e.expression.print(t);t.print(":");e._do_print_body(t)});DEFPRINT(ye,function(e,t){t.print("try");t.space();print_braced(e,t);if(e.bcatch){t.space();e.bcatch.print(t)}if(e.bfinally){t.space();e.bfinally.print(t)}});DEFPRINT(ke,function(e,t){t.print("catch");if(e.argname){t.space();t.with_parens(function(){e.argname.print(t)})}t.space();print_braced(e,t)});DEFPRINT(Se,function(e,t){t.print("finally");t.space();print_braced(e,t)});Ae.DEFMETHOD("_do_print",function(e,t){e.print(t);e.space();this.definitions.forEach(function(t,n){if(n)e.comma();t.print(e)});var n=e.parent();var i=n instanceof q||n instanceof W;var r=!i||n&&n.init!==this;if(r)e.semicolon()});DEFPRINT(Ce,function(e,t){e._do_print(t,"let")});DEFPRINT(Te,function(e,t){e._do_print(t,"var")});DEFPRINT(xe,function(e,t){e._do_print(t,"const")});DEFPRINT(we,function(e,t){t.print("import");t.space();if(e.imported_name){e.imported_name.print(t)}if(e.imported_name&&e.imported_names){t.print(",");t.space()}if(e.imported_names){if(e.imported_names.length===1&&e.imported_names[0].foreign_name.name==="*"){e.imported_names[0].print(t)}else{t.print("{");e.imported_names.forEach(function(n,i){t.space();n.print(t);if(i<e.imported_names.length-1){t.print(",")}});t.space();t.print("}")}}if(e.imported_name||e.imported_names){t.space();t.print("from");t.space()}e.module_name.print(t);t.semicolon()});DEFPRINT(Re,function(e,t){t.print("import.meta")});DEFPRINT(Fe,function(e,t){var n=t.parent()instanceof we;var i=e.name.definition();var r=(i&&i.mangled_name||e.name.name)!==e.foreign_name.name;if(r){if(n){t.print(e.foreign_name.name)}else{e.name.print(t)}t.space();t.print("as");t.space();if(n){e.name.print(t)}else{t.print(e.foreign_name.name)}}else{e.name.print(t)}});DEFPRINT(Me,function(e,t){t.print("export");t.space();if(e.is_default){t.print("default");t.space()}if(e.exported_names){if(e.exported_names.length===1&&e.exported_names[0].name.name==="*"){e.exported_names[0].print(t)}else{t.print("{");e.exported_names.forEach(function(n,i){t.space();n.print(t);if(i<e.exported_names.length-1){t.print(",")}});t.space();t.print("}")}}else if(e.exported_value){e.exported_value.print(t)}else if(e.exported_definition){e.exported_definition.print(t);if(e.exported_definition instanceof Ae)return}if(e.module_name){t.space();t.print("from");t.space();e.module_name.print(t)}if(e.exported_value&&!(e.exported_value instanceof ie||e.exported_value instanceof te||e.exported_value instanceof et)||e.module_name||e.exported_names){t.semicolon()}});function parenthesize_for_noin(e,t,n){var i=false;if(n){i=walk(e,e=>{if(e instanceof j)return true;if(e instanceof Ge&&e.operator=="in"){return zt}})}e.print(t,i)}DEFPRINT(Oe,function(e,t){e.name.print(t);if(e.value){t.space();t.print("=");t.space();var n=t.parent(1);var i=n instanceof q||n instanceof W;parenthesize_for_noin(e.value,t,i)}});DEFPRINT(Ne,function(e,t){e.expression.print(t);if(e instanceof Ie&&e.args.length===0)return;if(e.expression instanceof Ne||e.expression instanceof J){t.add_mapping(e.start)}t.with_parens(function(){e.args.forEach(function(e,n){if(n)t.comma();e.print(t)})})});DEFPRINT(Ie,function(e,t){t.print("new");t.space();Ne.prototype._codegen(e,t)});Pe.DEFMETHOD("_do_print",function(e){this.expressions.forEach(function(t,n){if(n>0){e.comma();if(e.should_break()){e.newline();e.indent()}}t.print(e)})});DEFPRINT(Pe,function(e,t){e._do_print(t)});DEFPRINT(Le,function(e,t){var n=e.expression;n.print(t);var i=e.property;var r=u.has(i)?t.option("ie8"):!is_identifier_string(i,t.option("ecma")>=2015);if(r){t.print("[");t.add_mapping(e.end);t.print_string(i);t.print("]")}else{if(n instanceof Ft&&n.getValue()>=0){if(!/[xa-f.)]/i.test(t.last())){t.print(".")}}t.print(".");t.add_mapping(e.end);t.print_name(i)}});DEFPRINT(Be,function(e,t){e.expression.print(t);t.print("[");e.property.print(t);t.print("]")});DEFPRINT(Ke,function(e,t){var n=e.operator;t.print(n);if(/^[a-z]/i.test(n)||/[+-]$/.test(n)&&e.expression instanceof Ke&&/^[+-]/.test(e.expression.operator)){t.space()}e.expression.print(t)});DEFPRINT(ze,function(e,t){e.expression.print(t);t.print(e.operator)});DEFPRINT(Ge,function(e,t){var n=e.operator;e.left.print(t);if(n[0]==">"&&e.left instanceof ze&&e.left.operator=="--"){t.print(" ")}else{t.space()}t.print(n);if((n=="<"||n=="<<")&&e.right instanceof Ke&&e.right.operator=="!"&&e.right.expression instanceof Ke&&e.right.expression.operator=="--"){t.print(" ")}else{t.space()}e.right.print(t)});DEFPRINT(He,function(e,t){e.condition.print(t);t.space();t.print("?");t.space();e.consequent.print(t);t.space();t.colon();e.alternative.print(t)});DEFPRINT(We,function(e,t){t.with_square(function(){var n=e.elements,i=n.length;if(i>0)t.space();n.forEach(function(e,n){if(n)t.comma();e.print(t);if(n===i-1&&e instanceof Vt)t.comma()});if(i>0)t.space()})});DEFPRINT(Ye,function(e,t){if(e.properties.length>0)t.with_block(function(){e.properties.forEach(function(e,n){if(n){t.print(",");t.newline()}t.indent();e.print(t)});t.newline()});else print_braced_empty(e,t)});DEFPRINT(et,function(e,t){t.print("class");t.space();if(e.name){e.name.print(t);t.space()}if(e.extends){var n=!(e.extends instanceof yt)&&!(e.extends instanceof Ve)&&!(e.extends instanceof it)&&!(e.extends instanceof te);t.print("extends");if(n){t.print("(")}else{t.space()}e.extends.print(t);if(n){t.print(")")}else{t.space()}}if(e.properties.length>0)t.with_block(function(){e.properties.forEach(function(e,n){if(n){t.newline()}t.indent();e.print(t)});t.newline()});else t.print("{}")});DEFPRINT(at,function(e,t){t.print("new.target")});function print_property_name(e,t,n){if(n.option("quote_keys")){return n.print_string(e)}if(""+ +e==e&&e>=0){if(n.option("keep_numbers")){return n.print(e)}return n.print(make_num(e))}var i=u.has(e)?n.option("ie8"):n.option("ecma")<2015?!is_basic_identifier_string(e):!is_identifier_string(e,true);if(i||t&&n.option("keep_quoted_props")){return n.print_string(e,t)}return n.print_name(e)}DEFPRINT(je,function(e,t){function get_name(e){var t=e.definition();return t?t.mangled_name||t.name:e.name}var n=t.option("shorthand");if(n&&e.value instanceof rt&&is_identifier_string(e.key,t.option("ecma")>=2015)&&get_name(e.value)===e.key&&!u.has(e.key)){print_property_name(e.key,e.quote,t)}else if(n&&e.value instanceof qe&&e.value.left instanceof rt&&is_identifier_string(e.key,t.option("ecma")>=2015)&&get_name(e.value.left)===e.key){print_property_name(e.key,e.quote,t);t.space();t.print("=");t.space();e.value.right.print(t)}else{if(!(e.key instanceof R)){print_property_name(e.key,e.quote,t)}else{t.with_square(function(){e.key.print(t)})}t.colon();e.value.print(t)}});DEFPRINT(tt,(e,t)=>{if(e.static){t.print("static");t.space()}if(e.key instanceof ht){print_property_name(e.key.name,e.quote,t)}else{t.print("[");e.key.print(t);t.print("]")}if(e.value){t.print("=");e.value.print(t)}t.semicolon()});$e.DEFMETHOD("_print_getter_setter",function(e,t){var n=this;if(n.static){t.print("static");t.space()}if(e){t.print(e);t.space()}if(n.key instanceof 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t=this.definition();e.print_name(t?t.mangled_name||t.name:this.name)});DEFPRINT(rt,function(e,t){e._do_print(t)});DEFPRINT(Vt,noop);DEFPRINT(Tt,function(e,t){t.print("this")});DEFPRINT(Ct,function(e,t){t.print("super")});DEFPRINT(xt,function(e,t){t.print(e.getValue())});DEFPRINT(Ot,function(e,t){t.print_string(e.getValue(),e.quote,t.in_directive)});DEFPRINT(Ft,function(e,t){if((t.option("keep_numbers")||t.use_asm)&&e.start&&e.start.raw!=null){t.print(e.start.raw)}else{t.print(make_num(e.getValue()))}});DEFPRINT(wt,function(e,t){t.print(e.getValue()+"n")});const e=/(<\s*\/\s*script)/i;const t=(e,t)=>t.replace("/","\\/");DEFPRINT(Rt,function(n,i){let{source:r,flags:a}=n.getValue();r=regexp_source_fix(r);a=a?sort_regexp_flags(a):"";r=r.replace(e,t);i.print(i.to_utf8(`/${r}/${a}`));const o=i.parent();if(o instanceof Ge&&/^\w/.test(o.operator)&&o.left===n){i.print(" ")}});function force_statement(e,t){if(t.option("braces")){make_block(e,t)}else{if(!e||e instanceof B)t.force_semicolon();else 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pt)&&keep_name(e.keep_fnames,this.orig[0].name)||this.orig[0]instanceof _t||(this.orig[0]instanceof Et||this.orig[0]instanceof mt)&&keep_name(e.keep_classnames,this.orig[0].name)}mangle(e){const t=e.cache&&e.cache.props;if(this.global&&t&&t.has(this.name)){this.mangled_name=t.get(this.name)}else if(!this.mangled_name&&!this.unmangleable(e)){var n=this.scope;var i=this.orig[0];if(e.ie8&&i instanceof dt)n=n.parent_scope;const r=redefined_catch_def(this);this.mangled_name=r?r.mangled_name||r.name:n.next_mangled(e,this);if(this.global&&t){t.set(this.name,this.mangled_name)}}}}SymbolDef.next_id=1;function redefined_catch_def(e){if(e.orig[0]instanceof gt&&e.scope.is_block_scope()){return e.scope.get_defun_scope().variables.get(e.name)}}j.DEFMETHOD("figure_out_scope",function(e,{parent_scope:t=null,toplevel:n=this}={}){e=defaults(e,{cache:null,ie8:false,safari10:false});if(!(n instanceof Z)){throw new Error("Invalid toplevel scope")}var i=this.parent_scope=t;var r=new Map;var a=null;var o=null;var s=[];var u=new TreeWalker((t,n)=>{if(t.is_block_scope()){const r=i;t.block_scope=i=new j(t);i._block_scope=true;const a=t instanceof ke?r.parent_scope:r;i.init_scope_vars(a);i.uses_with=r.uses_with;i.uses_eval=r.uses_eval;if(e.safari10){if(t instanceof q||t instanceof W){s.push(i)}}if(t instanceof ge){const e=i;i=r;t.expression.walk(u);i=e;for(let e=0;e<t.body.length;e++){t.body[e].walk(u)}}else{n()}i=r;return true}if(t instanceof re){const e=o;o=t;n();o=e;return true}if(t instanceof j){t.init_scope_vars(i);var c=i;var l=a;var f=r;a=i=t;r=new Map;n();i=c;a=l;r=f;return true}if(t instanceof K){var p=t.label;if(r.has(p.name)){throw new Error(string_template("Label {name} defined twice",p))}r.set(p.name,p);n();r.delete(p.name);return true}if(t instanceof $){for(var _=i;_;_=_.parent_scope)_.uses_with=true;return}if(t instanceof rt){t.scope=i}if(t instanceof bt){t.thedef=t;t.references=[]}if(t instanceof dt){a.def_function(t,t.name=="arguments"?undefined:a)}else if(t instanceof 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t=this.scope;while(t){push_uniq(t.enclosed,e);if(t===e.scope)break;t=t.parent_scope}});rt.DEFMETHOD("reference",function(){this.definition().references.push(this);this.mark_enclosed()});j.DEFMETHOD("find_variable",function(e){if(e instanceof rt)e=e.name;return this.variables.get(e)||this.parent_scope&&this.parent_scope.find_variable(e)});j.DEFMETHOD("def_function",function(e,t){var n=this.def_variable(e,t);if(!n.init||n.init instanceof ie)n.init=t;this.functions.set(e.name,n);return n});j.DEFMETHOD("def_variable",function(e,t){var n=this.variables.get(e.name);if(n){n.orig.push(e);if(n.init&&(n.scope!==e.scope||n.init instanceof te)){n.init=t}}else{n=new SymbolDef(this,e,t);this.variables.set(e.name,n);n.global=!this.parent_scope}return e.thedef=n});function next_mangled(e,t){var n=e.enclosed;e:while(true){var i=on(++e.cname);if(u.has(i))continue;if(t.reserved.has(i))continue;if(an&&an.has(i))continue e;for(let e=n.length;--e>=0;){const r=n[e];const 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this.thedef.global});Z.DEFMETHOD("_default_mangler_options",function(e){e=defaults(e,{eval:false,ie8:false,keep_classnames:false,keep_fnames:false,module:false,reserved:[],toplevel:false});if(e.module)e.toplevel=true;if(!Array.isArray(e.reserved)&&!(e.reserved instanceof Set)){e.reserved=[]}e.reserved=new Set(e.reserved);e.reserved.add("arguments");return e});Z.DEFMETHOD("mangle_names",function(e){e=this._default_mangler_options(e);var t=-1;var n=[];if(e.keep_fnames){rn=new Set}const i=this.mangled_names=new Set;if(e.cache){this.globals.forEach(collect);if(e.cache.props){e.cache.props.forEach(function(e){i.add(e)})}}var r=new TreeWalker(function(i,r){if(i instanceof K){var a=t;r();t=a;return true}if(i instanceof j){i.variables.forEach(collect);return}if(i.is_block_scope()){i.block_scope.variables.forEach(collect);return}if(rn&&i instanceof Oe&&i.value instanceof J&&!i.value.name&&keep_name(e.keep_fnames,i.name.name)){rn.add(i.name.definition().id);return}if(i instanceof bt){let e;do{e=on(++t)}while(u.has(e));i.mangled_name=e;return true}if(!(e.ie8||e.safari10)&&i instanceof gt){n.push(i.definition());return}});this.walk(r);if(e.keep_fnames||e.keep_classnames){an=new Set;n.forEach(t=>{if(t.name.length<6&&t.unmangleable(e)){an.add(t.name)}})}n.forEach(t=>{t.mangle(e)});rn=null;an=null;function collect(t){const i=!e.reserved.has(t.name)&&!(t.export&tn);if(i){n.push(t)}}});Z.DEFMETHOD("find_colliding_names",function(e){const t=e.cache&&e.cache.props;const n=new Set;e.reserved.forEach(to_avoid);this.globals.forEach(add_def);this.walk(new TreeWalker(function(e){if(e instanceof j)e.variables.forEach(add_def);if(e instanceof gt)add_def(e.definition())}));return n;function to_avoid(e){n.add(e)}function add_def(n){var i=n.name;if(n.global&&t&&t.has(i))i=t.get(i);else if(!n.unmangleable(e))return;to_avoid(i)}});Z.DEFMETHOD("expand_names",function(e){on.reset();on.sort();e=this._default_mangler_options(e);var t=this.find_colliding_names(e);var n=0;this.globals.forEach(rename);this.walk(new TreeWalker(function(e){if(e instanceof j)e.variables.forEach(rename);if(e instanceof gt)rename(e.definition())}));function next_name(){var e;do{e=on(n++)}while(t.has(e)||u.has(e));return e}function rename(t){if(t.global&&e.cache)return;if(t.unmangleable(e))return;if(e.reserved.has(t.name))return;const n=redefined_catch_def(t);const i=t.name=n?n.name:next_name();t.orig.forEach(function(e){e.name=i});t.references.forEach(function(e){e.name=i})}});R.DEFMETHOD("tail_node",return_this);Pe.DEFMETHOD("tail_node",function(){return this.expressions[this.expressions.length-1]});Z.DEFMETHOD("compute_char_frequency",function(e){e=this._default_mangler_options(e);try{R.prototype.print=function(t,n){this._print(t,n);if(this instanceof rt&&!this.unmangleable(e)){on.consider(this.name,-1)}else if(e.properties){if(this instanceof Le){on.consider(this.property,-1)}else if(this instanceof 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cn(this)+e+(Array.isArray(this.body)?un(this.body):this.body._size())};re.prototype._size=(()=>2);oe.prototype._size=function(){return 2+Math.floor(this.segments.length/2)*3};se.prototype._size=function(){return this.value.length};le.prototype._size=function(){return this.value?7:6};fe.prototype._size=(()=>6);_e.prototype._size=function(){return this.label?6:5};he.prototype._size=function(){return this.label?9:8};Ee.prototype._size=(()=>4);ge.prototype._size=function(){return 8+un(this.body)};be.prototype._size=function(){return 5+un(this.body)};De.prototype._size=function(){return 8+un(this.body)};ye.prototype._size=function(){return 3+un(this.body)};ke.prototype._size=function(){let e=7+un(this.body);if(this.argname){e+=2}return e};Se.prototype._size=function(){return 7+un(this.body)};const ln=(e,t)=>e+un(t.definitions);Te.prototype._size=function(){return ln(4,this)};Ce.prototype._size=function(){return ln(4,this)};xe.prototype._size=function(){return 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o,s=10;do{o=false;eliminate_spurious_blocks(e);if(t.option("dead_code")){eliminate_dead_code(e,t)}if(t.option("if_return")){handle_if_return(e,t)}if(t.sequences_limit>0){sequencesize(e,t);sequencesize_2(e,t)}if(t.option("join_vars")){join_consecutive_vars(e)}if(t.option("collapse_vars")){collapse(e,t)}}while(o&&s-- >0);function find_loop_scope_try(){var e=t.self(),i=0;do{if(e instanceof ke||e instanceof Se){i++}else if(e instanceof z){n=true}else if(e instanceof j){a=e;break}else if(e instanceof ye){r=true}}while(e=t.parent(i++))}function collapse(e,t){if(a.pinned())return e;var s;var u=[];var c=e.length;var l=new TreeTransformer(function(e){if(T)return e;if(!A){if(e!==p[_])return e;_++;if(_<p.length)return handle_custom_scan_order(e);A=true;m=find_stop(e,0);if(m===e)T=true;return e}var n=l.parent();if(e instanceof Xe&&e.operator!="="&&g.equivalent_to(e.left)||e instanceof de||e instanceof Ne&&g instanceof Ve&&g.equivalent_to(e.expression)||e instanceof N||e instanceof re||e instanceof 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be){if(!A){if(i!==p[_])continue;_++}i.expression=i.expression.transform(l);if(!y)break}}T=true;return e}}function redefined_within_scope(e,t){if(e.global)return false;let n=e.scope;while(n&&n!==t){if(n.variables.has(e.name))return true;n=n.parent_scope}return false}function has_overlapping_symbol(e,t,n){var i=false,r=!(e instanceof ne);t.walk(new TreeWalker(function(t,o){if(i)return true;if(t instanceof yt&&(e.variables.has(t.name)||redefined_within_scope(t.definition(),e))){var s=t.definition().scope;if(s!==a)while(s=s.parent_scope){if(s===a)return true}return i=true}if((n||r)&&t instanceof Tt){return i=true}if(t instanceof j&&!(t instanceof ne)){var u=r;r=false;o();r=u;return true}}));return i}function extract_args(){var e,n=t.self();if(is_func_expr(n)&&!n.name&&!n.uses_arguments&&!n.pinned()&&(e=t.parent())instanceof Ne&&e.expression===n&&e.args.every(e=>!(e instanceof Q))){var i=t.has_directive("use strict");if(i&&!member(i,n.body))i=false;var r=n.argnames.length;s=e.args.slice(r);var a=new Set;for(var o=r;--o>=0;){var c=n.argnames[o];var l=e.args[o];const r=c.definition&&c.definition();const p=r&&r.orig.length>1;if(p)continue;s.unshift(make_node(Oe,c,{name:c,value:l}));if(a.has(c.name))continue;a.add(c.name);if(c instanceof Q){var f=e.args.slice(o);if(f.every(e=>!has_overlapping_symbol(n,e,i))){u.unshift([make_node(Oe,c,{name:c.expression,value:make_node(We,e,{elements:f})})])}}else{if(!l){l=make_node(Pt,c).transform(t)}else if(l instanceof J&&l.pinned()||has_overlapping_symbol(n,l,i)){l=null}if(l)u.unshift([make_node(Oe,c,{name:c,value:l})])}}}}function extract_candidates(e){p.push(e);if(e instanceof Xe){if(!e.left.has_side_effects(t)){u.push(p.slice())}extract_candidates(e.right)}else if(e instanceof Ge){extract_candidates(e.left);extract_candidates(e.right)}else if(e instanceof Ne&&!has_annotation(e,Xt)){extract_candidates(e.expression);e.args.forEach(extract_candidates)}else if(e instanceof be){extract_candidates(e.expression)}else if(e instanceof He){extract_candidates(e.condition);extract_candidates(e.consequent);extract_candidates(e.alternative)}else if(e instanceof Ae){var n=e.definitions.length;var i=n-200;if(i<0)i=0;for(;i<n;i++){extract_candidates(e.definitions[i])}}else if(e instanceof G){extract_candidates(e.condition);if(!(e.body instanceof V)){extract_candidates(e.body)}}else if(e instanceof ce){if(e.value)extract_candidates(e.value)}else if(e instanceof q){if(e.init)extract_candidates(e.init);if(e.condition)extract_candidates(e.condition);if(e.step)extract_candidates(e.step);if(!(e.body instanceof V)){extract_candidates(e.body)}}else if(e instanceof W){extract_candidates(e.object);if(!(e.body instanceof V)){extract_candidates(e.body)}}else if(e instanceof Ee){extract_candidates(e.condition);if(!(e.body instanceof V)){extract_candidates(e.body)}if(e.alternative&&!(e.alternative instanceof V)){extract_candidates(e.alternative)}}else if(e instanceof Pe){e.expressions.forEach(extract_candidates)}else if(e instanceof P){extract_candidates(e.body)}else if(e instanceof ge){extract_candidates(e.expression);e.body.forEach(extract_candidates)}else if(e instanceof Ue){if(e.operator=="++"||e.operator=="--"){u.push(p.slice())}}else if(e instanceof Oe){if(e.value){u.push(p.slice());extract_candidates(e.value)}}p.pop()}function find_stop(e,t,n){var i=l.parent(t);if(i instanceof Xe){if(n&&!(i.left instanceof Ve||v.has(i.left.name))){return find_stop(i,t+1,n)}return e}if(i instanceof Ge){if(n&&(!xn.has(i.operator)||i.left===e)){return find_stop(i,t+1,n)}return e}if(i instanceof Ne)return e;if(i instanceof be)return e;if(i instanceof He){if(n&&i.condition===e){return find_stop(i,t+1,n)}return e}if(i instanceof Ae){return find_stop(i,t+1,true)}if(i instanceof ce){return n?find_stop(i,t+1,n):e}if(i instanceof Ee){if(n&&i.condition===e){return find_stop(i,t+1,n)}return e}if(i instanceof z)return e;if(i instanceof Pe){return find_stop(i,t+1,i.tail_node()!==e)}if(i instanceof P){return find_stop(i,t+1,true)}if(i instanceof ge)return e;if(i instanceof Oe)return e;return null}function mangleable_var(e){var t=e.value;if(!(t instanceof yt))return;if(t.name=="arguments")return;var n=t.definition();if(n.undeclared)return;return d=n}function get_lhs(e){if(e instanceof Oe&&e.name instanceof ot){var n=e.name.definition();if(!member(e.name,n.orig))return;var i=n.references.length-n.replaced;if(!i)return;var r=n.orig.length-n.eliminated;if(r>1&&!(e.name instanceof ft)||(i>1?mangleable_var(e):!t.exposed(n))){return make_node(yt,e.name,e.name)}}else{const t=e[e instanceof Xe?"left":"expression"];return!is_ref_of(t,ct)&&!is_ref_of(t,lt)&&t}}function get_rvalue(e){return e[e instanceof Xe?"right":"value"]}function get_lvalues(e){var n=new Map;if(e instanceof Ue)return n;var i=new TreeWalker(function(e){var r=e;while(r instanceof Ve)r=r.expression;if(r instanceof yt||r instanceof Tt){n.set(r.name,n.get(r.name)||is_modified(t,i,e,e,0))}});get_rvalue(e).walk(i);return n}function remove_candidate(n){if(n.name instanceof ft){var r=t.parent(),a=t.self().argnames;var o=a.indexOf(n.name);if(o<0){r.args.length=Math.min(r.args.length,a.length-1)}else{var s=r.args;if(s[o])s[o]=make_node(Ft,s[o],{value:0})}return true}var u=false;return e[c].transform(new TreeTransformer(function(e,t,r){if(u)return e;if(e===n||e.body===n){u=true;if(e instanceof Oe){e.value=e.name instanceof ct?make_node(Pt,e.value):null;return e}return r?i.skip:null}},function(e){if(e instanceof Pe)switch(e.expressions.length){case 0:return null;case 1:return e.expressions[0]}}))}function is_lhs_local(e){while(e instanceof Ve)e=e.expression;return e instanceof yt&&e.definition().scope===a&&!(n&&(v.has(e.name)||h instanceof Ue||h instanceof Xe&&h.operator!="="))}function value_has_side_effects(e){if(e instanceof Ue)return On.has(e.operator);return get_rvalue(e).has_side_effects(t)}function replace_all_symbols(){if(b)return false;if(d)return true;if(g instanceof yt){var e=g.definition();if(e.references.length-e.replaced==(h instanceof Oe?1:2)){return true}}return false}function may_modify(e){if(!e.definition)return true;var t=e.definition();if(t.orig.length==1&&t.orig[0]instanceof pt)return false;if(t.scope.get_defun_scope()!==a)return true;return!t.references.every(e=>{var t=e.scope.get_defun_scope();if(t.TYPE=="Scope")t=t.parent_scope;return t===a})}function side_effects_external(e,t){if(e instanceof Xe)return side_effects_external(e.left,true);if(e instanceof Ue)return side_effects_external(e.expression,true);if(e instanceof Oe)return e.value&&side_effects_external(e.value);if(t){if(e instanceof Le)return side_effects_external(e.expression,true);if(e instanceof Be)return side_effects_external(e.expression,true);if(e instanceof yt)return e.definition().scope!==a}return false}}function eliminate_spurious_blocks(e){var t=[];for(var n=0;n<e.length;){var i=e[n];if(i instanceof L&&i.body.every(can_be_evicted_from_block)){o=true;eliminate_spurious_blocks(i.body);e.splice(n,1,...i.body);n+=i.body.length}else if(i instanceof B){o=true;e.splice(n,1)}else if(i instanceof I){if(t.indexOf(i.value)<0){n++;t.push(i.value)}else{o=true;e.splice(n,1)}}else n++}}function handle_if_return(e,t){var n=t.self();var i=has_multiple_if_returns(e);var r=n instanceof J;for(var a=e.length;--a>=0;){var s=e[a];var u=next_index(a);var c=e[u];if(r&&!c&&s instanceof le){if(!s.value){o=true;e.splice(a,1);continue}if(s.value instanceof Ke&&s.value.operator=="void"){o=true;e[a]=make_node(P,s,{body:s.value.expression});continue}}if(s instanceof Ee){var l=aborts(s.body);if(can_merge_flow(l)){if(l.label){remove(l.label.thedef.references,l)}o=true;s=s.clone();s.condition=s.condition.negate(t);var f=as_statement_array_with_return(s.body,l);s.body=make_node(L,s,{body:as_statement_array(s.alternative).concat(extract_functions())});s.alternative=make_node(L,s,{body:f});e[a]=s.transform(t);continue}var l=aborts(s.alternative);if(can_merge_flow(l)){if(l.label){remove(l.label.thedef.references,l)}o=true;s=s.clone();s.body=make_node(L,s.body,{body:as_statement_array(s.body).concat(extract_functions())});var f=as_statement_array_with_return(s.alternative,l);s.alternative=make_node(L,s.alternative,{body:f});e[a]=s.transform(t);continue}}if(s instanceof Ee&&s.body instanceof le){var p=s.body.value;if(!p&&!s.alternative&&(r&&!c||c instanceof le&&!c.value)){o=true;e[a]=make_node(P,s.condition,{body:s.condition});continue}if(p&&!s.alternative&&c instanceof le&&c.value){o=true;s=s.clone();s.alternative=c;e[a]=s.transform(t);e.splice(u,1);continue}if(p&&!s.alternative&&(!c&&r&&i||c instanceof le)){o=true;s=s.clone();s.alternative=c||make_node(le,s,{value:null});e[a]=s.transform(t);if(c)e.splice(u,1);continue}var _=e[prev_index(a)];if(t.option("sequences")&&r&&!s.alternative&&_ instanceof Ee&&_.body instanceof le&&next_index(u)==e.length&&c instanceof P){o=true;s=s.clone();s.alternative=make_node(L,c,{body:[c,make_node(le,c,{value:null})]});e[a]=s.transform(t);e.splice(u,1);continue}}}function has_multiple_if_returns(e){var t=0;for(var n=e.length;--n>=0;){var i=e[n];if(i instanceof Ee&&i.body instanceof le){if(++t>1)return true}}return false}function is_return_void(e){return!e||e instanceof Ke&&e.operator=="void"}function can_merge_flow(i){if(!i)return false;for(var o=a+1,s=e.length;o<s;o++){var u=e[o];if(u instanceof xe||u instanceof Ce)return false}var c=i instanceof pe?t.loopcontrol_target(i):null;return i instanceof le&&r&&is_return_void(i.value)||i instanceof he&&n===loop_body(c)||i instanceof _e&&c instanceof L&&n===c}function extract_functions(){var t=e.slice(a+1);e.length=a+1;return t.filter(function(t){if(t instanceof ie){e.push(t);return false}return true})}function as_statement_array_with_return(e,t){var n=as_statement_array(e).slice(0,-1);if(t.value){n.push(make_node(P,t.value,{body:t.value.expression}))}return n}function next_index(t){for(var n=t+1,i=e.length;n<i;n++){var r=e[n];if(!(r instanceof Te&&declarations_only(r))){break}}return n}function prev_index(t){for(var n=t;--n>=0;){var i=e[n];if(!(i instanceof Te&&declarations_only(i))){break}}return n}}function eliminate_dead_code(e,t){var n;var i=t.self();for(var r=0,a=0,s=e.length;r<s;r++){var u=e[r];if(u instanceof pe){var c=t.loopcontrol_target(u);if(u instanceof _e&&!(c instanceof z)&&loop_body(c)===i||u instanceof he&&loop_body(c)===i){if(u.label){remove(u.label.thedef.references,u)}}else{e[a++]=u}}else{e[a++]=u}if(aborts(u)){n=e.slice(r+1);break}}e.length=a;o=a!=s;if(n)n.forEach(function(n){trim_unreachable_code(t,n,e)})}function declarations_only(e){return e.definitions.every(e=>!e.value)}function sequencesize(e,t){if(e.length<2)return;var n=[],i=0;function push_seq(){if(!n.length)return;var t=make_sequence(n[0],n);e[i++]=make_node(P,t,{body:t});n=[]}for(var r=0,a=e.length;r<a;r++){var s=e[r];if(s instanceof P){if(n.length>=t.sequences_limit)push_seq();var u=s.body;if(n.length>0)u=u.drop_side_effect_free(t);if(u)merge_sequence(n,u)}else if(s instanceof Ae&&declarations_only(s)||s instanceof ie){e[i++]=s}else{push_seq();e[i++]=s}}push_seq();e.length=i;if(i!=a)o=true}function to_simple_statement(e,t){if(!(e instanceof L))return e;var n=null;for(var i=0,r=e.body.length;i<r;i++){var a=e.body[i];if(a instanceof Te&&declarations_only(a)){t.push(a)}else if(n){return false}else{n=a}}return n}function sequencesize_2(e,t){function cons_seq(e){n--;o=true;var r=i.body;return make_sequence(r,[r,e]).transform(t)}var n=0,i;for(var r=0;r<e.length;r++){var a=e[r];if(i){if(a instanceof ce){a.value=cons_seq(a.value||make_node(Pt,a).transform(t))}else if(a instanceof q){if(!(a.init instanceof Ae)){const e=walk(i.body,e=>{if(e instanceof j)return true;if(e instanceof Ge&&e.operator==="in"){return zt}});if(!e){if(a.init)a.init=cons_seq(a.init);else{a.init=i.body;n--;o=true}}}}else if(a instanceof W){if(!(a.init instanceof xe)&&!(a.init instanceof Ce)){a.object=cons_seq(a.object)}}else if(a instanceof Ee){a.condition=cons_seq(a.condition)}else if(a instanceof ge){a.expression=cons_seq(a.expression)}else if(a instanceof $){a.expression=cons_seq(a.expression)}}if(t.option("conditionals")&&a instanceof Ee){var s=[];var u=to_simple_statement(a.body,s);var c=to_simple_statement(a.alternative,s);if(u!==false&&c!==false&&s.length>0){var l=s.length;s.push(make_node(Ee,a,{condition:a.condition,body:u||make_node(B,a.body),alternative:c}));s.unshift(n,1);[].splice.apply(e,s);r+=l;n+=l+1;i=null;o=true;continue}}e[n++]=a;i=a instanceof P?a:null}e.length=n}function join_object_assignments(e,n){if(!(e instanceof Ae))return;var i=e.definitions[e.definitions.length-1];if(!(i.value instanceof Ye))return;var r;if(n instanceof Xe){r=[n]}else if(n instanceof Pe){r=n.expressions.slice()}if(!r)return;var o=false;do{var s=r[0];if(!(s instanceof Xe))break;if(s.operator!="=")break;if(!(s.left instanceof Ve))break;var u=s.left.expression;if(!(u instanceof yt))break;if(i.name.name!=u.name)break;if(!s.right.is_constant_expression(a))break;var c=s.left.property;if(c instanceof R){c=c.evaluate(t)}if(c instanceof R)break;c=""+c;var l=t.option("ecma")<2015&&t.has_directive("use strict")?function(e){return e.key!=c&&(e.key&&e.key.name!=c)}:function(e){return e.key&&e.key.name!=c};if(!i.value.properties.every(l))break;var f=i.value.properties.filter(function(e){return e.key===c})[0];if(!f){i.value.properties.push(make_node(je,s,{key:c,value:s.right}))}else{f.value=new Pe({start:f.start,expressions:[f.value.clone(),s.right.clone()],end:f.end})}r.shift();o=true}while(r.length);return o&&r}function join_consecutive_vars(e){var t;for(var n=0,i=-1,r=e.length;n<r;n++){var a=e[n];var s=e[i];if(a instanceof Ae){if(s&&s.TYPE==a.TYPE){s.definitions=s.definitions.concat(a.definitions);o=true}else if(t&&t.TYPE==a.TYPE&&declarations_only(a)){t.definitions=t.definitions.concat(a.definitions);o=true}else{e[++i]=a;t=a}}else if(a instanceof ce){a.value=extract_object_assignments(a.value)}else if(a instanceof q){var u=join_object_assignments(s,a.init);if(u){o=true;a.init=u.length?make_sequence(a.init,u):null;e[++i]=a}else if(s instanceof Te&&(!a.init||a.init.TYPE==s.TYPE)){if(a.init){s.definitions=s.definitions.concat(a.init.definitions)}a.init=s;e[i]=a;o=true}else if(t&&a.init&&t.TYPE==a.init.TYPE&&declarations_only(a.init)){t.definitions=t.definitions.concat(a.init.definitions);a.init=null;e[++i]=a;o=true}else{e[++i]=a}}else if(a instanceof W){a.object=extract_object_assignments(a.object)}else if(a instanceof Ee){a.condition=extract_object_assignments(a.condition)}else if(a instanceof P){var 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instanceof R)){if(n)return make_node(q,e,{body:make_node(L,e.body,{body:[e.body,make_node(P,e.condition,{body:e.condition})]})}).optimize(t);if(!has_break_or_continue(e,t.parent())){return make_node(L,e.body,{body:[e.body,make_node(P,e.condition,{body:e.condition})]}).optimize(t)}}return e});function if_break_in_loop(e,t){var n=e.body instanceof L?e.body.body[0]:e.body;if(t.option("dead_code")&&is_break(n)){var i=[];if(e.init instanceof M){i.push(e.init)}else if(e.init){i.push(make_node(P,e.init,{body:e.init}))}if(e.condition){i.push(make_node(P,e.condition,{body:e.condition}))}trim_unreachable_code(t,e.body,i);return make_node(L,e,{body:i})}if(n instanceof Ee){if(is_break(n.body)){if(e.condition){e.condition=make_node(Ge,e.condition,{left:e.condition,operator:"&&",right:n.condition.negate(t)})}else{e.condition=n.condition.negate(t)}drop_it(n.alternative)}else if(is_break(n.alternative)){if(e.condition){e.condition=make_node(Ge,e.condition,{left:e.condition,operator:"&&",right:n.condition})}else{e.condition=n.condition}drop_it(n.body)}}return e;function is_break(e){return e instanceof _e&&t.loopcontrol_target(e)===t.self()}function drop_it(n){n=as_statement_array(n);if(e.body instanceof L){e.body=e.body.clone();e.body.body=n.concat(e.body.body.slice(1));e.body=e.body.transform(t)}else{e.body=make_node(L,e.body,{body:n}).transform(t)}e=if_break_in_loop(e,t)}}def_optimize(q,function(e,t){if(!t.option("loops"))return e;if(t.option("side_effects")&&e.init){e.init=e.init.drop_side_effect_free(t)}if(e.condition){var n=e.condition.evaluate(t);if(!(n instanceof R)){if(n)e.condition=null;else if(!t.option("dead_code")){var i=e.condition;e.condition=make_node_from_constant(n,e.condition);e.condition=best_of_expression(e.condition.transform(t),i)}}if(t.option("dead_code")){if(n instanceof R)n=e.condition.tail_node().evaluate(t);if(!n){var r=[];trim_unreachable_code(t,e.body,r);if(e.init instanceof M){r.push(e.init)}else if(e.init){r.push(make_node(P,e.init,{body:e.init}))}r.push(make_node(P,e.condition,{body:e.condition}));return make_node(L,e,{body:r}).optimize(t)}}}return if_break_in_loop(e,t)});def_optimize(Ee,function(e,t){if(is_empty(e.alternative))e.alternative=null;if(!t.option("conditionals"))return e;var n=e.condition.evaluate(t);if(!t.option("dead_code")&&!(n instanceof R)){var i=e.condition;e.condition=make_node_from_constant(n,i);e.condition=best_of_expression(e.condition.transform(t),i)}if(t.option("dead_code")){if(n instanceof R)n=e.condition.tail_node().evaluate(t);if(!n){var r=[];trim_unreachable_code(t,e.body,r);r.push(make_node(P,e.condition,{body:e.condition}));if(e.alternative)r.push(e.alternative);return make_node(L,e,{body:r}).optimize(t)}else if(!(n instanceof R)){var r=[];r.push(make_node(P,e.condition,{body:e.condition}));r.push(e.body);if(e.alternative){trim_unreachable_code(t,e.alternative,r)}return make_node(L,e,{body:r}).optimize(t)}}var a=e.condition.negate(t);var o=e.condition.size();var s=a.size();var u=s<o;if(e.alternative&&u){u=false;e.condition=a;var c=e.body;e.body=e.alternative||make_node(B,e);e.alternative=c}if(is_empty(e.body)&&is_empty(e.alternative)){return make_node(P,e.condition,{body:e.condition.clone()}).optimize(t)}if(e.body instanceof P&&e.alternative instanceof P){return make_node(P,e,{body:make_node(He,e,{condition:e.condition,consequent:e.body.body,alternative:e.alternative.body})}).optimize(t)}if(is_empty(e.alternative)&&e.body instanceof P){if(o===s&&!u&&e.condition instanceof Ge&&e.condition.operator=="||"){u=true}if(u)return make_node(P,e,{body:make_node(Ge,e,{operator:"||",left:a,right:e.body.body})}).optimize(t);return make_node(P,e,{body:make_node(Ge,e,{operator:"&&",left:e.condition,right:e.body.body})}).optimize(t)}if(e.body instanceof B&&e.alternative instanceof P){return make_node(P,e,{body:make_node(Ge,e,{operator:"||",left:e.condition,right:e.alternative.body})}).optimize(t)}if(e.body instanceof ce&&e.alternative instanceof ce&&e.body.TYPE==e.alternative.TYPE){return make_node(e.body.CTOR,e,{value:make_node(He,e,{condition:e.condition,consequent:e.body.value||make_node(Pt,e.body),alternative:e.alternative.value||make_node(Pt,e.alternative)}).transform(t)}).optimize(t)}if(e.body instanceof Ee&&!e.body.alternative&&!e.alternative){e=make_node(Ee,e,{condition:make_node(Ge,e.condition,{operator:"&&",left:e.condition,right:e.body.condition}),body:e.body.body,alternative:null})}if(aborts(e.body)){if(e.alternative){var l=e.alternative;e.alternative=null;return make_node(L,e,{body:[e,l]}).optimize(t)}}if(aborts(e.alternative)){var r=e.body;e.body=e.alternative;e.condition=u?a:e.condition.negate(t);e.alternative=null;return make_node(L,e,{body:[e,r]}).optimize(t)}return e});def_optimize(ge,function(e,t){if(!t.option("switches"))return e;var n;var i=e.expression.evaluate(t);if(!(i instanceof R)){var r=e.expression;e.expression=make_node_from_constant(i,r);e.expression=best_of_expression(e.expression.transform(t),r)}if(!t.option("dead_code"))return e;if(i instanceof R){i=e.expression.tail_node().evaluate(t)}var a=[];var o=[];var s;var u;for(var c=0,l=e.body.length;c<l&&!u;c++){n=e.body[c];if(n instanceof De){if(!s){s=n}else{eliminate_branch(n,o[o.length-1])}}else if(!(i instanceof R)){var f=n.expression.evaluate(t);if(!(f instanceof R)&&f!==i){eliminate_branch(n,o[o.length-1]);continue}if(f instanceof R)f=n.expression.tail_node().evaluate(t);if(f===i){u=n;if(s){var p=o.indexOf(s);o.splice(p,1);eliminate_branch(s,o[p-1]);s=null}}}if(aborts(n)){var _=o[o.length-1];if(aborts(_)&&_.body.length==n.body.length&&make_node(L,_,_).equivalent_to(make_node(L,n,n))){_.body=[]}}o.push(n)}while(c<l)eliminate_branch(e.body[c++],o[o.length-1]);if(o.length>0){o[0].body=a.concat(o[0].body)}e.body=o;while(n=o[o.length-1]){var h=n.body[n.body.length-1];if(h instanceof _e&&t.loopcontrol_target(h)===e)n.body.pop();if(n.body.length||n instanceof be&&(s||n.expression.has_side_effects(t)))break;if(o.pop()===s)s=null}if(o.length==0){return make_node(L,e,{body:a.concat(make_node(P,e.expression,{body:e.expression}))}).optimize(t)}if(o.length==1&&(o[0]===u||o[0]===s)){var d=false;var m=new TreeWalker(function(t){if(d||t instanceof J||t instanceof P)return true;if(t instanceof _e&&m.loopcontrol_target(t)===e)d=true});e.walk(m);if(!d){var E=o[0].body.slice();var f=o[0].expression;if(f)E.unshift(make_node(P,f,{body:f}));E.unshift(make_node(P,e.expression,{body:e.expression}));return make_node(L,e,{body:E}).optimize(t)}}return e;function eliminate_branch(e,n){if(n&&!aborts(n)){n.body=n.body.concat(e.body)}else{trim_unreachable_code(t,e,a)}}});def_optimize(ye,function(e,t){tighten_body(e.body,t);if(e.bcatch&&e.bfinally&&e.bfinally.body.every(is_empty))e.bfinally=null;if(t.option("dead_code")&&e.body.every(is_empty)){var n=[];if(e.bcatch){trim_unreachable_code(t,e.bcatch,n)}if(e.bfinally)n.push(...e.bfinally.body);return make_node(L,e,{body:n}).optimize(t)}return e});Ae.DEFMETHOD("remove_initializers",function(){var e=[];this.definitions.forEach(function(t){if(t.name instanceof ot){t.value=null;e.push(t)}else{walk(t.name,n=>{if(n instanceof ot){e.push(make_node(Oe,t,{name:n,value:null}))}})}});this.definitions=e});Ae.DEFMETHOD("to_assignments",function(e){var t=e.option("reduce_vars");var n=this.definitions.reduce(function(e,n){if(n.value&&!(n.name instanceof re)){var i=make_node(yt,n.name,n.name);e.push(make_node(Xe,n,{operator:"=",left:i,right:n.value}));if(t)i.definition().fixed=false}else if(n.value){var r=make_node(Oe,n,{name:n.name,value:n.value});var a=make_node(Te,n,{definitions:[r]});e.push(a)}n=n.name.definition();n.eliminated++;n.replaced--;return e},[]);if(n.length==0)return null;return make_sequence(this,n)});def_optimize(Ae,function(e){if(e.definitions.length==0)return make_node(B,e);return e});def_optimize(we,function(e){return e});function retain_top_func(e,t){return t.top_retain&&e instanceof ie&&kn(e,bn)&&e.name&&t.top_retain(e.name)}def_optimize(Ne,function(e,t){var n=e.expression;var i=n;inline_array_like_spread(e,t,e.args);var r=e.args.every(e=>!(e instanceof Q));if(t.option("reduce_vars")&&i instanceof yt&&!has_annotation(e,Xt)){const e=i.fixed_value();if(!retain_top_func(e,t)){i=e}}var a=i instanceof J;if(a&&i.pinned())return e;if(t.option("unused")&&r&&a&&!i.uses_arguments){var o=0,s=0;for(var u=0,c=e.args.length;u<c;u++){if(i.argnames[u]instanceof Q){if(kn(i.argnames[u].expression,_n))while(u<c){var l=e.args[u++].drop_side_effect_free(t);if(l){e.args[o++]=l}}else while(u<c){e.args[o++]=e.args[u++]}s=o;break}var f=u>=i.argnames.length;if(f||kn(i.argnames[u],_n)){var l=e.args[u].drop_side_effect_free(t);if(l){e.args[o++]=l}else if(!f){e.args[o++]=make_node(Ft,e.args[u],{value:0});continue}}else{e.args[o++]=e.args[u]}s=o}e.args.length=s}if(t.option("unsafe")){if(is_undeclared_ref(n))switch(n.name){case"Array":if(e.args.length!=1){return make_node(We,e,{elements:e.args}).optimize(t)}else if(e.args[0]instanceof Ft&&e.args[0].value<=11){const t=[];for(let n=0;n<e.args[0].value;n++)t.push(new Vt);return new We({elements:t})}break;case"Object":if(e.args.length==0){return make_node(Ye,e,{properties:[]})}break;case"String":if(e.args.length==0)return make_node(Ot,e,{value:""});if(e.args.length<=1)return make_node(Ge,e,{left:e.args[0],operator:"+",right:make_node(Ot,e,{value:""})}).optimize(t);break;case"Number":if(e.args.length==0)return make_node(Ft,e,{value:0});if(e.args.length==1&&t.option("unsafe_math")){return make_node(Ke,e,{expression:e.args[0],operator:"+"}).optimize(t)}break;case"Symbol":if(e.args.length==1&&e.args[0]instanceof Ot&&t.option("unsafe_symbols"))e.args.length=0;break;case"Boolean":if(e.args.length==0)return make_node(Ut,e);if(e.args.length==1)return make_node(Ke,e,{expression:make_node(Ke,e,{expression:e.args[0],operator:"!"}),operator:"!"}).optimize(t);break;case"RegExp":var p=[];if(e.args.length>=1&&e.args.length<=2&&e.args.every(e=>{var n=e.evaluate(t);p.push(n);return e!==n})){let[n,i]=p;n=regexp_source_fix(new RegExp(n).source);const r=make_node(Rt,e,{value:{source:n,flags:i}});if(r._eval(t)!==r){return r}}break}else if(n instanceof Le)switch(n.property){case"toString":if(e.args.length==0&&!n.expression.may_throw_on_access(t)){return make_node(Ge,e,{left:make_node(Ot,e,{value:""}),operator:"+",right:n.expression}).optimize(t)}break;case"join":if(n.expression instanceof We)e:{var _;if(e.args.length>0){_=e.args[0].evaluate(t);if(_===e.args[0])break e}var h=[];var d=[];for(var u=0,c=n.expression.elements.length;u<c;u++){var m=n.expression.elements[u];if(m instanceof Q)break e;var E=m.evaluate(t);if(E!==m){d.push(E)}else{if(d.length>0){h.push(make_node(Ot,e,{value:d.join(_)}));d.length=0}h.push(m)}}if(d.length>0){h.push(make_node(Ot,e,{value:d.join(_)}))}if(h.length==0)return make_node(Ot,e,{value:""});if(h.length==1){if(h[0].is_string(t)){return h[0]}return make_node(Ge,h[0],{operator:"+",left:make_node(Ot,e,{value:""}),right:h[0]})}if(_==""){var g;if(h[0].is_string(t)||h[1].is_string(t)){g=h.shift()}else{g=make_node(Ot,e,{value:""})}return h.reduce(function(e,t){return make_node(Ge,t,{operator:"+",left:e,right:t})},g).optimize(t)}var l=e.clone();l.expression=l.expression.clone();l.expression.expression=l.expression.expression.clone();l.expression.expression.elements=h;return best_of(t,e,l)}break;case"charAt":if(n.expression.is_string(t)){var v=e.args[0];var D=v?v.evaluate(t):0;if(D!==v){return make_node(Be,n,{expression:n.expression,property:make_node_from_constant(D|0,v||n)}).optimize(t)}}break;case"apply":if(e.args.length==2&&e.args[1]instanceof We){var b=e.args[1].elements.slice();b.unshift(e.args[0]);return make_node(Ne,e,{expression:make_node(Le,n,{expression:n.expression,property:"call"}),args:b}).optimize(t)}break;case"call":var y=n.expression;if(y instanceof yt){y=y.fixed_value()}if(y instanceof J&&!y.contains_this()){return(e.args.length?make_sequence(this,[e.args[0],make_node(Ne,e,{expression:n.expression,args:e.args.slice(1)})]):make_node(Ne,e,{expression:n.expression,args:[]})).optimize(t)}break}}if(t.option("unsafe_Function")&&is_undeclared_ref(n)&&n.name=="Function"){if(e.args.length==0)return make_node(te,e,{argnames:[],body:[]}).optimize(t);if(e.args.every(e=>e instanceof Ot)){try{var k="n(function("+e.args.slice(0,-1).map(function(e){return e.value}).join(",")+"){"+e.args[e.args.length-1].value+"})";var S=parse(k);var A={ie8:t.option("ie8")};S.figure_out_scope(A);var T=new Compressor(t.options);S=S.transform(T);S.figure_out_scope(A);on.reset();S.compute_char_frequency(A);S.mangle_names(A);var C;walk(S,e=>{if(is_func_expr(e)){C=e;return zt}});var k=OutputStream();L.prototype._codegen.call(C,C,k);e.args=[make_node(Ot,e,{value:C.argnames.map(function(e){return e.print_to_string()}).join(",")}),make_node(Ot,e.args[e.args.length-1],{value:k.get().replace(/^{|}$/g,"")})];return e}catch(e){if(!(e instanceof JS_Parse_Error)){throw e}}}}var x=a&&i.body[0];var O=a&&!i.is_generator&&!i.async;var F=O&&t.option("inline")&&!e.is_expr_pure(t);if(F&&x instanceof le){let n=x.value;if(!n||n.is_constant_expression()){if(n){n=n.clone(true)}else{n=make_node(Pt,e)}const i=e.args.concat(n);return make_sequence(e,i).optimize(t)}if(i.argnames.length===1&&i.argnames[0]instanceof ft&&e.args.length<2&&n instanceof yt&&n.name===i.argnames[0].name){const n=(e.args[0]||make_node(Pt)).optimize(t);let i;if(n instanceof Ve&&(i=t.parent())instanceof Ne&&i.expression===e){return make_sequence(e,[make_node(Ft,e,{value:0}),n])}return n}}if(F){var w,R,M=-1;let a;let o;let s;if(r&&!i.uses_arguments&&!(t.parent()instanceof et)&&!(i.name&&i instanceof te)&&(o=can_flatten_body(x))&&(n===i||has_annotation(e,Ht)||t.option("unused")&&(a=n.definition()).references.length==1&&!recursive_ref(t,a)&&i.is_constant_expression(n.scope))&&!has_annotation(e,Gt|Xt)&&!i.contains_this()&&can_inject_symbols()&&(s=find_scope(t))&&!scope_encloses_variables_in_this_scope(s,i)&&!function in_default_assign(){let e=0;let n;while(n=t.parent(e++)){if(n instanceof qe)return true;if(n instanceof V)break}return false}()&&!(w instanceof et)){Sn(i,vn);s.add_child_scope(i);return make_sequence(e,flatten_fn(o)).optimize(t)}}if(F&&has_annotation(e,Ht)){Sn(i,vn);i=make_node(i.CTOR===ie?te:i.CTOR,i,i);i.figure_out_scope({},{parent_scope:find_scope(t),toplevel:t.get_toplevel()});return make_node(Ne,e,{expression:i,args:e.args}).optimize(t)}const N=O&&t.option("side_effects")&&i.body.every(is_empty);if(N){var b=e.args.concat(make_node(Pt,e));return make_sequence(e,b).optimize(t)}if(t.option("negate_iife")&&t.parent()instanceof P&&is_iife_call(e)){return e.negate(t,true)}var I=e.evaluate(t);if(I!==e){I=make_node_from_constant(I,e).optimize(t);return best_of(t,I,e)}return e;function return_value(t){if(!t)return make_node(Pt,e);if(t instanceof le){if(!t.value)return make_node(Pt,e);return t.value.clone(true)}if(t instanceof P){return make_node(Ke,t,{operator:"void",expression:t.body.clone(true)})}}function can_flatten_body(e){var n=i.body;var r=n.length;if(t.option("inline")<3){return r==1&&return_value(e)}e=null;for(var a=0;a<r;a++){var o=n[a];if(o instanceof Te){if(e&&!o.definitions.every(e=>!e.value)){return false}}else if(e){return false}else if(!(o instanceof B)){e=o}}return return_value(e)}function can_inject_args(e,t){for(var n=0,r=i.argnames.length;n<r;n++){var a=i.argnames[n];if(a instanceof qe){if(kn(a.left,_n))continue;return false}if(a instanceof re)return false;if(a instanceof Q){if(kn(a.expression,_n))continue;return false}if(kn(a,_n))continue;if(!t||e.has(a.name)||Cn.has(a.name)||w.conflicting_def(a.name)){return false}if(R)R.push(a.definition())}return true}function can_inject_vars(e,t){var n=i.body.length;for(var r=0;r<n;r++){var a=i.body[r];if(!(a instanceof Te))continue;if(!t)return false;for(var o=a.definitions.length;--o>=0;){var s=a.definitions[o].name;if(s instanceof re||e.has(s.name)||Cn.has(s.name)||w.conflicting_def(s.name)){return false}if(R)R.push(s.definition())}}return true}function can_inject_symbols(){var e=new Set;do{w=t.parent(++M);if(w.is_block_scope()&&w.block_scope){w.block_scope.variables.forEach(function(t){e.add(t.name)})}if(w instanceof ke){if(w.argname){e.add(w.argname.name)}}else if(w instanceof z){R=[]}else if(w instanceof yt){if(w.fixed_value()instanceof j)return false}}while(!(w instanceof j));var n=!(w instanceof Z)||t.toplevel.vars;var r=t.option("inline");if(!can_inject_vars(e,r>=3&&n))return false;if(!can_inject_args(e,r>=2&&n))return false;return!R||R.length==0||!is_reachable(i,R)}function append_var(t,n,i,r){var a=i.definition();const o=w.variables.has(i.name);if(!o){w.variables.set(i.name,a);w.enclosed.push(a);t.push(make_node(Oe,i,{name:i,value:null}))}var s=make_node(yt,i,i);a.references.push(s);if(r)n.push(make_node(Xe,e,{operator:"=",left:s,right:r.clone()}))}function flatten_args(t,n){var r=i.argnames.length;for(var a=e.args.length;--a>=r;){n.push(e.args[a])}for(a=r;--a>=0;){var o=i.argnames[a];var s=e.args[a];if(kn(o,_n)||!o.name||w.conflicting_def(o.name)){if(s)n.push(s)}else{var u=make_node(st,o,o);o.definition().orig.push(u);if(!s&&R)s=make_node(Pt,e);append_var(t,n,u,s)}}t.reverse();n.reverse()}function flatten_vars(e,t){var n=t.length;for(var r=0,a=i.body.length;r<a;r++){var o=i.body[r];if(!(o instanceof Te))continue;for(var s=0,u=o.definitions.length;s<u;s++){var c=o.definitions[s];var l=c.name;append_var(e,t,l,c.value);if(R&&i.argnames.every(e=>e.name!=l.name)){var f=i.variables.get(l.name);var p=make_node(yt,l,l);f.references.push(p);t.splice(n++,0,make_node(Xe,c,{operator:"=",left:p,right:make_node(Pt,l)}))}}}}function flatten_fn(e){var n=[];var r=[];flatten_args(n,r);flatten_vars(n,r);r.push(e);if(n.length){const e=w.body.indexOf(t.parent(M-1))+1;w.body.splice(e,0,make_node(Te,i,{definitions:n}))}return r.map(e=>e.clone(true))}});def_optimize(Ie,function(e,t){if(t.option("unsafe")&&is_undeclared_ref(e.expression)&&["Object","RegExp","Function","Error","Array"].includes(e.expression.name))return make_node(Ne,e,e).transform(t);return e});def_optimize(Pe,function(e,t){if(!t.option("side_effects"))return e;var n=[];filter_for_side_effects();var i=n.length-1;trim_right_for_undefined();if(i==0){e=maintain_this_binding(t.parent(),t.self(),n[0]);if(!(e instanceof Pe))e=e.optimize(t);return e}e.expressions=n;return e;function filter_for_side_effects(){var i=first_in_statement(t);var r=e.expressions.length-1;e.expressions.forEach(function(e,a){if(a<r)e=e.drop_side_effect_free(t,i);if(e){merge_sequence(n,e);i=false}})}function trim_right_for_undefined(){while(i>0&&is_undefined(n[i],t))i--;if(i<n.length-1){n[i]=make_node(Ke,e,{operator:"void",expression:n[i]});n.length=i+1}}});Ue.DEFMETHOD("lift_sequences",function(e){if(e.option("sequences")){if(this.expression instanceof Pe){var t=this.expression.expressions.slice();var n=this.clone();n.expression=t.pop();t.push(n);return make_sequence(this,t).optimize(e)}}return this});def_optimize(ze,function(e,t){return e.lift_sequences(t)});def_optimize(Ke,function(e,t){var n=e.expression;if(e.operator=="delete"&&!(n instanceof yt||n instanceof Ve||is_identifier_atom(n))){if(n instanceof Pe){const i=n.expressions.slice();i.push(make_node(Kt,e));return make_sequence(e,i).optimize(t)}return make_sequence(e,[n,make_node(Kt,e)]).optimize(t)}var i=e.lift_sequences(t);if(i!==e){return i}if(t.option("side_effects")&&e.operator=="void"){n=n.drop_side_effect_free(t);if(n){e.expression=n;return e}else{return make_node(Pt,e).optimize(t)}}if(t.in_boolean_context()){switch(e.operator){case"!":if(n instanceof Ke&&n.operator=="!"){return n.expression}if(n instanceof Ge){e=best_of(t,e,n.negate(t,first_in_statement(t)))}break;case"typeof":return(n instanceof yt?make_node(Kt,e):make_sequence(e,[n,make_node(Kt,e)])).optimize(t)}}if(e.operator=="-"&&n instanceof Lt){n=n.transform(t)}if(n instanceof Ge&&(e.operator=="+"||e.operator=="-")&&(n.operator=="*"||n.operator=="/"||n.operator=="%")){return make_node(Ge,e,{operator:n.operator,left:make_node(Ke,n.left,{operator:e.operator,expression:n.left}),right:n.right})}if(e.operator!="-"||!(n instanceof Ft||n instanceof Lt||n instanceof wt)){var r=e.evaluate(t);if(r!==e){r=make_node_from_constant(r,e).optimize(t);return best_of(t,r,e)}}return e});Ge.DEFMETHOD("lift_sequences",function(e){if(e.option("sequences")){if(this.left instanceof Pe){var t=this.left.expressions.slice();var n=this.clone();n.left=t.pop();t.push(n);return make_sequence(this,t).optimize(e)}if(this.right instanceof Pe&&!this.left.has_side_effects(e)){var i=this.operator=="="&&this.left instanceof yt;var t=this.right.expressions;var r=t.length-1;for(var a=0;a<r;a++){if(!i&&t[a].has_side_effects(e))break}if(a==r){t=t.slice();var n=this.clone();n.right=t.pop();t.push(n);return make_sequence(this,t).optimize(e)}else if(a>0){var n=this.clone();n.right=make_sequence(this.right,t.slice(a));t=t.slice(0,a);t.push(n);return make_sequence(this,t).optimize(e)}}}return this});var Vn=makePredicate("== === != !== * & | ^");function is_object(e){return e instanceof We||e instanceof J||e instanceof Ye||e instanceof et}def_optimize(Ge,function(e,t){function reversible(){return e.left.is_constant()||e.right.is_constant()||!e.left.has_side_effects(t)&&!e.right.has_side_effects(t)}function reverse(t){if(reversible()){if(t)e.operator=t;var n=e.left;e.left=e.right;e.right=n}}if(Vn.has(e.operator)){if(e.right.is_constant()&&!e.left.is_constant()){if(!(e.left instanceof Ge&&O[e.left.operator]>=O[e.operator])){reverse()}}}e=e.lift_sequences(t);if(t.option("comparisons"))switch(e.operator){case"===":case"!==":var n=true;if(e.left.is_string(t)&&e.right.is_string(t)||e.left.is_number(t)&&e.right.is_number(t)||e.left.is_boolean()&&e.right.is_boolean()||e.left.equivalent_to(e.right)){e.operator=e.operator.substr(0,2)}case"==":case"!=":if(!n&&is_undefined(e.left,t)){e.left=make_node(Nt,e.left)}else if(t.option("typeofs")&&e.left instanceof Ot&&e.left.value=="undefined"&&e.right instanceof Ke&&e.right.operator=="typeof"){var i=e.right.expression;if(i instanceof yt?i.is_declared(t):!(i instanceof Ve&&t.option("ie8"))){e.right=i;e.left=make_node(Pt,e.left).optimize(t);if(e.operator.length==2)e.operator+="="}}else if(e.left instanceof yt&&e.right instanceof yt&&e.left.definition()===e.right.definition()&&is_object(e.left.fixed_value())){return make_node(e.operator[0]=="="?Kt:Ut,e)}break;case"&&":case"||":var r=e.left;if(r.operator==e.operator){r=r.right}if(r instanceof Ge&&r.operator==(e.operator=="&&"?"!==":"===")&&e.right instanceof Ge&&r.operator==e.right.operator&&(is_undefined(r.left,t)&&e.right.left instanceof Nt||r.left instanceof Nt&&is_undefined(e.right.left,t))&&!r.right.has_side_effects(t)&&r.right.equivalent_to(e.right.right)){var a=make_node(Ge,e,{operator:r.operator.slice(0,-1),left:make_node(Nt,e),right:r.right});if(r!==e.left){a=make_node(Ge,e,{operator:e.operator,left:e.left.left,right:a})}return a}break}if(e.operator=="+"&&t.in_boolean_context()){var o=e.left.evaluate(t);var s=e.right.evaluate(t);if(o&&typeof o=="string"){return make_sequence(e,[e.right,make_node(Kt,e)]).optimize(t)}if(s&&typeof s=="string"){return make_sequence(e,[e.left,make_node(Kt,e)]).optimize(t)}}if(t.option("comparisons")&&e.is_boolean()){if(!(t.parent()instanceof Ge)||t.parent()instanceof Xe){var u=make_node(Ke,e,{operator:"!",expression:e.negate(t,first_in_statement(t))});e=best_of(t,e,u)}if(t.option("unsafe_comps")){switch(e.operator){case"<":reverse(">");break;case"<=":reverse(">=");break}}}if(e.operator=="+"){if(e.right instanceof Ot&&e.right.getValue()==""&&e.left.is_string(t)){return e.left}if(e.left instanceof Ot&&e.left.getValue()==""&&e.right.is_string(t)){return e.right}if(e.left instanceof Ge&&e.left.operator=="+"&&e.left.left instanceof Ot&&e.left.left.getValue()==""&&e.right.is_string(t)){e.left=e.left.right;return e.transform(t)}}if(t.option("evaluate")){switch(e.operator){case"&&":var o=kn(e.left,hn)?true:kn(e.left,dn)?false:e.left.evaluate(t);if(!o){return maintain_this_binding(t.parent(),t.self(),e.left).optimize(t)}else if(!(o instanceof R)){return make_sequence(e,[e.left,e.right]).optimize(t)}var s=e.right.evaluate(t);if(!s){if(t.in_boolean_context()){return make_sequence(e,[e.left,make_node(Ut,e)]).optimize(t)}else{Sn(e,dn)}}else if(!(s instanceof R)){var c=t.parent();if(c.operator=="&&"&&c.left===t.self()||t.in_boolean_context()){return e.left.optimize(t)}}if(e.left.operator=="||"){var l=e.left.right.evaluate(t);if(!l)return make_node(He,e,{condition:e.left.left,consequent:e.right,alternative:e.left.right}).optimize(t)}break;case"||":var o=kn(e.left,hn)?true:kn(e.left,dn)?false:e.left.evaluate(t);if(!o){return make_sequence(e,[e.left,e.right]).optimize(t)}else if(!(o instanceof R)){return maintain_this_binding(t.parent(),t.self(),e.left).optimize(t)}var s=e.right.evaluate(t);if(!s){var c=t.parent();if(c.operator=="||"&&c.left===t.self()||t.in_boolean_context()){return e.left.optimize(t)}}else if(!(s instanceof R)){if(t.in_boolean_context()){return make_sequence(e,[e.left,make_node(Kt,e)]).optimize(t)}else{Sn(e,hn)}}if(e.left.operator=="&&"){var l=e.left.right.evaluate(t);if(l&&!(l instanceof R))return make_node(He,e,{condition:e.left.left,consequent:e.left.right,alternative:e.right}).optimize(t)}break;case"??":if(is_nullish(e.left)){return e.right}var o=e.left.evaluate(t);if(!(o instanceof R)){return o==null?e.right:e.left}if(t.in_boolean_context()){const n=e.right.evaluate(t);if(!(n instanceof R)&&!n){return e.left}}}var f=true;switch(e.operator){case"+":if(e.left instanceof xt&&e.right instanceof Ge&&e.right.operator=="+"&&e.right.is_string(t)){var p=make_node(Ge,e,{operator:"+",left:e.left,right:e.right.left});var _=p.optimize(t);if(p!==_){e=make_node(Ge,e,{operator:"+",left:_,right:e.right.right})}}if(e.right instanceof xt&&e.left instanceof Ge&&e.left.operator=="+"&&e.left.is_string(t)){var p=make_node(Ge,e,{operator:"+",left:e.left.right,right:e.right});var h=p.optimize(t);if(p!==h){e=make_node(Ge,e,{operator:"+",left:e.left.left,right:h})}}if(e.left instanceof Ge&&e.left.operator=="+"&&e.left.is_string(t)&&e.right instanceof Ge&&e.right.operator=="+"&&e.right.is_string(t)){var p=make_node(Ge,e,{operator:"+",left:e.left.right,right:e.right.left});var d=p.optimize(t);if(p!==d){e=make_node(Ge,e,{operator:"+",left:make_node(Ge,e.left,{operator:"+",left:e.left.left,right:d}),right:e.right.right})}}if(e.right instanceof Ke&&e.right.operator=="-"&&e.left.is_number(t)){e=make_node(Ge,e,{operator:"-",left:e.left,right:e.right.expression});break}if(e.left instanceof Ke&&e.left.operator=="-"&&reversible()&&e.right.is_number(t)){e=make_node(Ge,e,{operator:"-",left:e.right,right:e.left.expression});break}if(e.left instanceof oe){var _=e.left;var h=e.right.evaluate(t);if(h!=e.right){_.segments[_.segments.length-1].value+=h.toString();return _}}if(e.right instanceof oe){var h=e.right;var _=e.left.evaluate(t);if(_!=e.left){h.segments[0].value=_.toString()+h.segments[0].value;return h}}if(e.left instanceof oe&&e.right instanceof oe){var _=e.left;var m=_.segments;var h=e.right;m[m.length-1].value+=h.segments[0].value;for(var E=1;E<h.segments.length;E++){m.push(h.segments[E])}return _}case"*":f=t.option("unsafe_math");case"&":case"|":case"^":if(e.left.is_number(t)&&e.right.is_number(t)&&reversible()&&!(e.left instanceof Ge&&e.left.operator!=e.operator&&O[e.left.operator]>=O[e.operator])){var g=make_node(Ge,e,{operator:e.operator,left:e.right,right:e.left});if(e.right instanceof xt&&!(e.left instanceof xt)){e=best_of(t,g,e)}else{e=best_of(t,e,g)}}if(f&&e.is_number(t)){if(e.right instanceof Ge&&e.right.operator==e.operator){e=make_node(Ge,e,{operator:e.operator,left:make_node(Ge,e.left,{operator:e.operator,left:e.left,right:e.right.left,start:e.left.start,end:e.right.left.end}),right:e.right.right})}if(e.right instanceof xt&&e.left instanceof Ge&&e.left.operator==e.operator){if(e.left.left instanceof xt){e=make_node(Ge,e,{operator:e.operator,left:make_node(Ge,e.left,{operator:e.operator,left:e.left.left,right:e.right,start:e.left.left.start,end:e.right.end}),right:e.left.right})}else if(e.left.right instanceof xt){e=make_node(Ge,e,{operator:e.operator,left:make_node(Ge,e.left,{operator:e.operator,left:e.left.right,right:e.right,start:e.left.right.start,end:e.right.end}),right:e.left.left})}}if(e.left instanceof Ge&&e.left.operator==e.operator&&e.left.right instanceof xt&&e.right instanceof Ge&&e.right.operator==e.operator&&e.right.left instanceof xt){e=make_node(Ge,e,{operator:e.operator,left:make_node(Ge,e.left,{operator:e.operator,left:make_node(Ge,e.left.left,{operator:e.operator,left:e.left.right,right:e.right.left,start:e.left.right.start,end:e.right.left.end}),right:e.left.left}),right:e.right.right})}}}}if(e.right instanceof Ge&&e.right.operator==e.operator&&(xn.has(e.operator)||e.operator=="+"&&(e.right.left.is_string(t)||e.left.is_string(t)&&e.right.right.is_string(t)))){e.left=make_node(Ge,e.left,{operator:e.operator,left:e.left,right:e.right.left});e.right=e.right.right;return e.transform(t)}var v=e.evaluate(t);if(v!==e){v=make_node_from_constant(v,e).optimize(t);return best_of(t,v,e)}return e});def_optimize(kt,function(e){return e});function recursive_ref(e,t){var n;for(var i=0;n=e.parent(i);i++){if(n instanceof J||n instanceof et){var r=n.name;if(r&&r.definition()===t)break}}return n}function within_array_or_object_literal(e){var t,n=0;while(t=e.parent(n++)){if(t instanceof M)return false;if(t instanceof We||t instanceof je||t instanceof Ye){return true}}return false}def_optimize(yt,function(e,t){if(!t.option("ie8")&&is_undeclared_ref(e)&&!t.find_parent($)){switch(e.name){case"undefined":return make_node(Pt,e).optimize(t);case"NaN":return make_node(It,e).optimize(t);case"Infinity":return make_node(Lt,e).optimize(t)}}const n=t.parent();if(t.option("reduce_vars")&&is_lhs(e,n)!==e){const a=e.definition();const o=find_scope(t);if(t.top_retain&&a.global&&t.top_retain(a)){a.fixed=false;a.single_use=false;return e}let s=e.fixed_value();let u=a.single_use&&!(n instanceof Ne&&n.is_expr_pure(t)||has_annotation(n,Xt));if(u&&(s instanceof J||s instanceof et)){if(retain_top_func(s,t)){u=false}else if(a.scope!==e.scope&&(a.escaped==1||kn(s,En)||within_array_or_object_literal(t))){u=false}else if(recursive_ref(t,a)){u=false}else if(a.scope!==e.scope||a.orig[0]instanceof ft){u=s.is_constant_expression(e.scope);if(u=="f"){var i=e.scope;do{if(i instanceof ie||is_func_expr(i)){Sn(i,En)}}while(i=i.parent_scope)}}}if(u&&s instanceof J){u=a.scope===e.scope&&!scope_encloses_variables_in_this_scope(o,s)||n instanceof Ne&&n.expression===e&&!scope_encloses_variables_in_this_scope(o,s)}if(u&&s instanceof et){const e=!s.extends||!s.extends.may_throw(t)&&!s.extends.has_side_effects(t);u=e&&!s.properties.some(e=>e.may_throw(t)||e.has_side_effects(t))}if(u&&s){if(s instanceof nt){Sn(s,vn);s=make_node(it,s,s)}if(s instanceof ie){Sn(s,vn);s=make_node(te,s,s)}if(a.recursive_refs>0&&s.name instanceof pt){const e=s.name.definition();let t=s.variables.get(s.name.name);let n=t&&t.orig[0];if(!(n instanceof dt)){n=make_node(dt,s.name,s.name);n.scope=s;s.name=n;t=s.def_function(n)}walk(s,n=>{if(n instanceof yt&&n.definition()===e){n.thedef=t;t.references.push(n)}})}if((s instanceof J||s instanceof et)&&s.parent_scope!==o){s=s.clone(true,t.get_toplevel());o.add_child_scope(s)}return s.optimize(t)}if(s){let e;if(s instanceof Tt){if(!(a.orig[0]instanceof ft)&&a.references.every(e=>a.scope===e.scope)){e=s}}else{var r=s.evaluate(t);if(r!==s&&(t.option("unsafe_regexp")||!(r instanceof RegExp))){e=make_node_from_constant(r,s)}}if(e){const n=a.name.length;const i=e.size();let r=0;if(t.option("unused")&&!t.exposed(a)){r=(n+2+i)/(a.references.length-a.assignments)}if(i<=n+r){return e}}}}return e});function scope_encloses_variables_in_this_scope(e,t){for(const n of t.enclosed){if(t.variables.has(n.name)){continue}const i=e.find_variable(n.name);if(i){if(i===n)continue;return true}}return false}function is_atomic(e,t){return e instanceof yt||e.TYPE===t.TYPE}def_optimize(Pt,function(e,t){if(t.option("unsafe_undefined")){var n=find_variable(t,"undefined");if(n){var i=make_node(yt,e,{name:"undefined",scope:n.scope,thedef:n});Sn(i,mn);return i}}var r=is_lhs(t.self(),t.parent());if(r&&is_atomic(r,e))return e;return make_node(Ke,e,{operator:"void",expression:make_node(Ft,e,{value:0})})});def_optimize(Lt,function(e,t){var n=is_lhs(t.self(),t.parent());if(n&&is_atomic(n,e))return e;if(t.option("keep_infinity")&&!(n&&!is_atomic(n,e))&&!find_variable(t,"Infinity")){return e}return make_node(Ge,e,{operator:"/",left:make_node(Ft,e,{value:1}),right:make_node(Ft,e,{value:0})})});def_optimize(It,function(e,t){var n=is_lhs(t.self(),t.parent());if(n&&!is_atomic(n,e)||find_variable(t,"NaN")){return make_node(Ge,e,{operator:"/",left:make_node(Ft,e,{value:0}),right:make_node(Ft,e,{value:0})})}return e});function is_reachable(e,t){const n=e=>{if(e instanceof yt&&member(e.definition(),t)){return zt}};return walk_parent(e,(t,i)=>{if(t instanceof j&&t!==e){var r=i.parent();if(r instanceof Ne&&r.expression===t)return;if(walk(t,n))return zt;return true}})}const Ln=makePredicate("+ - / * % >> << >>> | ^ &");const Bn=makePredicate("* | ^ &");def_optimize(Xe,function(e,t){var n;if(t.option("dead_code")&&e.left instanceof yt&&(n=e.left.definition()).scope===t.find_parent(J)){var i=0,r,a=e;do{r=a;a=t.parent(i++);if(a instanceof ce){if(in_try(i,a))break;if(is_reachable(n.scope,[n]))break;if(e.operator=="=")return e.right;n.fixed=false;return make_node(Ge,e,{operator:e.operator.slice(0,-1),left:e.left,right:e.right}).optimize(t)}}while(a instanceof Ge&&a.right===r||a instanceof Pe&&a.tail_node()===r)}e=e.lift_sequences(t);if(e.operator=="="&&e.left instanceof yt&&e.right instanceof Ge){if(e.right.left instanceof yt&&e.right.left.name==e.left.name&&Ln.has(e.right.operator)){e.operator=e.right.operator+"=";e.right=e.right.right}else if(e.right.right instanceof yt&&e.right.right.name==e.left.name&&Bn.has(e.right.operator)&&!e.right.left.has_side_effects(t)){e.operator=e.right.operator+"=";e.right=e.right.left}}return e;function in_try(n,i){var r=e.right;e.right=make_node(Nt,r);var a=i.may_throw(t);e.right=r;var o=e.left.definition().scope;var s;while((s=t.parent(n++))!==o){if(s instanceof ye){if(s.bfinally)return true;if(a&&s.bcatch)return true}}}});def_optimize(qe,function(e,t){if(!t.option("evaluate")){return e}var n=e.right.evaluate(t);if(n===undefined){e=e.left}else if(n!==e.right){n=make_node_from_constant(n,e.right);e.right=best_of_expression(n,e.right)}return e});function is_nullish(e){let t;return e instanceof Nt||is_undefined(e)||e instanceof yt&&(t=e.definition().fixed)instanceof R&&is_nullish(t)}function is_nullish_check(e,t,n){if(t.may_throw(n))return false;let i;if(e instanceof Ge&&e.operator==="=="&&((i=is_nullish(e.left)&&e.left)||(i=is_nullish(e.right)&&e.right))&&(i===e.left?e.right:e.left).equivalent_to(t)){return true}if(e instanceof Ge&&e.operator==="||"){let n;let i;const r=e=>{if(!(e instanceof Ge&&(e.operator==="==="||e.operator==="=="))){return false}let r=0;let a;if(e.left instanceof Nt){r++;n=e;a=e.right}if(e.right instanceof Nt){r++;n=e;a=e.left}if(is_undefined(e.left)){r++;i=e;a=e.right}if(is_undefined(e.right)){r++;i=e;a=e.left}if(r!==1){return false}if(!a.equivalent_to(t)){return false}return true};if(!r(e.left))return false;if(!r(e.right))return false;if(n&&i&&n!==i){return true}}return false}def_optimize(He,function(e,t){if(!t.option("conditionals"))return e;if(e.condition instanceof Pe){var n=e.condition.expressions.slice();e.condition=n.pop();n.push(e);return make_sequence(e,n)}var i=e.condition.evaluate(t);if(i!==e.condition){if(i){return maintain_this_binding(t.parent(),t.self(),e.consequent)}else{return maintain_this_binding(t.parent(),t.self(),e.alternative)}}var r=i.negate(t,first_in_statement(t));if(best_of(t,i,r)===r){e=make_node(He,e,{condition:r,consequent:e.alternative,alternative:e.consequent})}var a=e.condition;var o=e.consequent;var s=e.alternative;if(a instanceof yt&&o instanceof yt&&a.definition()===o.definition()){return make_node(Ge,e,{operator:"||",left:a,right:s})}if(o instanceof Xe&&s instanceof Xe&&o.operator==s.operator&&o.left.equivalent_to(s.left)&&(!e.condition.has_side_effects(t)||o.operator=="="&&!o.left.has_side_effects(t))){return make_node(Xe,e,{operator:o.operator,left:o.left,right:make_node(He,e,{condition:e.condition,consequent:o.right,alternative:s.right})})}var u;if(o instanceof Ne&&s.TYPE===o.TYPE&&o.args.length>0&&o.args.length==s.args.length&&o.expression.equivalent_to(s.expression)&&!e.condition.has_side_effects(t)&&!o.expression.has_side_effects(t)&&typeof(u=single_arg_diff())=="number"){var c=o.clone();c.args[u]=make_node(He,e,{condition:e.condition,consequent:o.args[u],alternative:s.args[u]});return c}if(s instanceof He&&o.equivalent_to(s.consequent)){return make_node(He,e,{condition:make_node(Ge,e,{operator:"||",left:a,right:s.condition}),consequent:o,alternative:s.alternative}).optimize(t)}if(t.option("ecma")>=2020&&is_nullish_check(a,s,t)){return make_node(Ge,e,{operator:"??",left:s,right:o}).optimize(t)}if(s instanceof Pe&&o.equivalent_to(s.expressions[s.expressions.length-1])){return make_sequence(e,[make_node(Ge,e,{operator:"||",left:a,right:make_sequence(e,s.expressions.slice(0,-1))}),o]).optimize(t)}if(s instanceof Ge&&s.operator=="&&"&&o.equivalent_to(s.right)){return make_node(Ge,e,{operator:"&&",left:make_node(Ge,e,{operator:"||",left:a,right:s.left}),right:o}).optimize(t)}if(o instanceof He&&o.alternative.equivalent_to(s)){return make_node(He,e,{condition:make_node(Ge,e,{left:e.condition,operator:"&&",right:o.condition}),consequent:o.consequent,alternative:s})}if(o.equivalent_to(s)){return make_sequence(e,[e.condition,o]).optimize(t)}if(o instanceof Ge&&o.operator=="||"&&o.right.equivalent_to(s)){return make_node(Ge,e,{operator:"||",left:make_node(Ge,e,{operator:"&&",left:e.condition,right:o.left}),right:s}).optimize(t)}var l=t.in_boolean_context();if(is_true(e.consequent)){if(is_false(e.alternative)){return booleanize(e.condition)}return make_node(Ge,e,{operator:"||",left:booleanize(e.condition),right:e.alternative})}if(is_false(e.consequent)){if(is_true(e.alternative)){return booleanize(e.condition.negate(t))}return make_node(Ge,e,{operator:"&&",left:booleanize(e.condition.negate(t)),right:e.alternative})}if(is_true(e.alternative)){return make_node(Ge,e,{operator:"||",left:booleanize(e.condition.negate(t)),right:e.consequent})}if(is_false(e.alternative)){return make_node(Ge,e,{operator:"&&",left:booleanize(e.condition),right:e.consequent})}return e;function booleanize(e){if(e.is_boolean())return e;return make_node(Ke,e,{operator:"!",expression:e.negate(t)})}function is_true(e){return e instanceof Kt||l&&e instanceof xt&&e.getValue()||e instanceof Ke&&e.operator=="!"&&e.expression instanceof xt&&!e.expression.getValue()}function is_false(e){return e instanceof Ut||l&&e instanceof xt&&!e.getValue()||e instanceof Ke&&e.operator=="!"&&e.expression instanceof xt&&e.expression.getValue()}function single_arg_diff(){var e=o.args;var t=s.args;for(var n=0,i=e.length;n<i;n++){if(e[n]instanceof Q)return;if(!e[n].equivalent_to(t[n])){if(t[n]instanceof Q)return;for(var r=n+1;r<i;r++){if(e[r]instanceof Q)return;if(!e[r].equivalent_to(t[r]))return}return n}}}});def_optimize(Bt,function(e,t){if(t.in_boolean_context())return make_node(Ft,e,{value:+e.value});var n=t.parent();if(t.option("booleans_as_integers")){if(n instanceof Ge&&(n.operator=="==="||n.operator=="!==")){n.operator=n.operator.replace(/=$/,"")}return make_node(Ft,e,{value:+e.value})}if(t.option("booleans")){if(n instanceof Ge&&(n.operator=="=="||n.operator=="!=")){return make_node(Ft,e,{value:+e.value})}return make_node(Ke,e,{operator:"!",expression:make_node(Ft,e,{value:1-e.value})})}return e});function safe_to_flatten(e,t){if(e instanceof yt){e=e.fixed_value()}if(!e)return false;if(!(e instanceof J||e instanceof et))return true;if(!(e instanceof J&&e.contains_this()))return true;return t.parent()instanceof Ie}def_optimize(Be,function(e,t){var n=e.expression;var i=e.property;if(t.option("properties")){var r=i.evaluate(t);if(r!==i){if(typeof r=="string"){if(r=="undefined"){r=undefined}else{var a=parseFloat(r);if(a.toString()==r){r=a}}}i=e.property=best_of_expression(i,make_node_from_constant(r,i).transform(t));var o=""+r;if(is_basic_identifier_string(o)&&o.length<=i.size()+1){return make_node(Le,e,{expression:n,property:o,quote:i.quote}).optimize(t)}}}var s;e:if(t.option("arguments")&&n instanceof yt&&n.name=="arguments"&&n.definition().orig.length==1&&(s=n.scope)instanceof J&&s.uses_arguments&&!(s instanceof ne)&&i instanceof Ft){var u=i.getValue();var c=new Set;var l=s.argnames;for(var f=0;f<l.length;f++){if(!(l[f]instanceof ft)){break e}var p=l[f].name;if(c.has(p)){break e}c.add(p)}var _=s.argnames[u];if(_&&t.has_directive("use strict")){var h=_.definition();if(!t.option("reduce_vars")||h.assignments||h.orig.length>1){_=null}}else if(!_&&!t.option("keep_fargs")&&u<s.argnames.length+5){while(u>=s.argnames.length){_=s.create_symbol(ft,{source:s,scope:s,tentative_name:"argument_"+s.argnames.length});s.argnames.push(_)}}if(_){var d=make_node(yt,e,_);d.reference({});An(_,_n);return d}}if(is_lhs(e,t.parent()))return e;if(r!==i){var m=e.flatten_object(o,t);if(m){n=e.expression=m.expression;i=e.property=m.property}}if(t.option("properties")&&t.option("side_effects")&&i instanceof Ft&&n instanceof We){var u=i.getValue();var E=n.elements;var g=E[u];e:if(safe_to_flatten(g,t)){var v=true;var D=[];for(var b=E.length;--b>u;){var a=E[b].drop_side_effect_free(t);if(a){D.unshift(a);if(v&&a.has_side_effects(t))v=false}}if(g instanceof Q)break e;g=g instanceof Vt?make_node(Pt,g):g;if(!v)D.unshift(g);while(--b>=0){var a=E[b];if(a instanceof Q)break e;a=a.drop_side_effect_free(t);if(a)D.unshift(a);else u--}if(v){D.push(g);return make_sequence(e,D).optimize(t)}else return make_node(Be,e,{expression:make_node(We,n,{elements:D}),property:make_node(Ft,i,{value:u})})}}var y=e.evaluate(t);if(y!==e){y=make_node_from_constant(y,e).optimize(t);return best_of(t,y,e)}return e});J.DEFMETHOD("contains_this",function(){return walk(this,e=>{if(e instanceof Tt)return zt;if(e!==this&&e instanceof j&&!(e instanceof ne)){return true}})});Ve.DEFMETHOD("flatten_object",function(e,t){if(!t.option("properties"))return;var n=t.option("unsafe_arrows")&&t.option("ecma")>=2015;var i=this.expression;if(i instanceof Ye){var r=i.properties;for(var a=r.length;--a>=0;){var o=r[a];if(""+(o instanceof Je?o.key.name:o.key)==e){if(!r.every(e=>{return e instanceof je||n&&e instanceof Je&&!e.is_generator}))break;if(!safe_to_flatten(o.value,t))break;return make_node(Be,this,{expression:make_node(We,i,{elements:r.map(function(e){var t=e.value;if(t instanceof ee)t=make_node(te,t,t);var n=e.key;if(n instanceof R&&!(n instanceof _t)){return make_sequence(e,[n,t])}return t})}),property:make_node(Ft,this,{value:a})})}}}});def_optimize(Le,function(e,t){const n=t.parent();if(is_lhs(e,n))return e;if(t.option("unsafe_proto")&&e.expression instanceof Le&&e.expression.property=="prototype"){var i=e.expression.expression;if(is_undeclared_ref(i))switch(i.name){case"Array":e.expression=make_node(We,e.expression,{elements:[]});break;case"Function":e.expression=make_node(te,e.expression,{argnames:[],body:[]});break;case"Number":e.expression=make_node(Ft,e.expression,{value:0});break;case"Object":e.expression=make_node(Ye,e.expression,{properties:[]});break;case"RegExp":e.expression=make_node(Rt,e.expression,{value:{source:"t",flags:""}});break;case"String":e.expression=make_node(Ot,e.expression,{value:""});break}}if(!(n instanceof Ne)||!has_annotation(n,Xt)){const n=e.flatten_object(e.property,t);if(n)return n.optimize(t)}let r=e.evaluate(t);if(r!==e){r=make_node_from_constant(r,e).optimize(t);return best_of(t,r,e)}return e});function literals_in_boolean_context(e,t){if(t.in_boolean_context()){return best_of(t,e,make_sequence(e,[e,make_node(Kt,e)]).optimize(t))}return e}function inline_array_like_spread(e,t,n){for(var i=0;i<n.length;i++){var r=n[i];if(r instanceof Q){var a=r.expression;if(a instanceof We){n.splice(i,1,...a.elements);i--}}}return e}def_optimize(We,function(e,t){var n=literals_in_boolean_context(e,t);if(n!==e){return n}return inline_array_like_spread(e,t,e.elements)});def_optimize(Ye,function(e,t){var n=literals_in_boolean_context(e,t);if(n!==e){return n}var i=e.properties;for(var r=0;r<i.length;r++){var a=i[r];if(a instanceof Q){var o=a.expression;if(o instanceof Ye){i.splice.apply(i,[r,1].concat(a.expression.properties));r--}else if(o instanceof xt&&!(o instanceof Ot)){i.splice(r,1)}}}return e});def_optimize(Rt,literals_in_boolean_context);def_optimize(le,function(e,t){if(e.value&&is_undefined(e.value,t)){e.value=null}return e});def_optimize(ne,opt_AST_Lambda);def_optimize(te,function(e,t){e=opt_AST_Lambda(e,t);if(t.option("unsafe_arrows")&&t.option("ecma")>=2015&&!e.name&&!e.is_generator&&!e.uses_arguments&&!e.pinned()){const n=walk(e,e=>{if(e instanceof Tt)return zt});if(!n)return make_node(ne,e,e).optimize(t)}return e});def_optimize(et,function(e){return e});def_optimize(me,function(e,t){if(e.expression&&!e.is_star&&is_undefined(e.expression,t)){e.expression=null}return e});def_optimize(oe,function(e,t){if(!t.option("evaluate")||t.parent()instanceof ae)return e;var n=[];for(var i=0;i<e.segments.length;i++){var r=e.segments[i];if(r instanceof R){var a=r.evaluate(t);if(a!==r&&(a+"").length<=r.size()+"${}".length){n[n.length-1].value=n[n.length-1].value+a+e.segments[++i].value;continue}if(r instanceof oe){var o=r.segments;n[n.length-1].value+=o[0].value;for(var s=1;s<o.length;s++){r=o[s];n.push(r)}continue}}n.push(r)}e.segments=n;if(n.length==1){return make_node(Ot,e,n[0])}if(n.length===3&&n[1]instanceof R){if(n[2].value===""){return make_node(Ge,e,{operator:"+",left:make_node(Ot,e,{value:n[0].value}),right:n[1]})}if(n[0].value===""){return make_node(Ge,e,{operator:"+",left:n[1],right:make_node(Ot,e,{value:n[2].value})})}}return e});def_optimize(ae,function(e){return e});function lift_key(e,t){if(!t.option("computed_props"))return e;if(!(e.key instanceof xt))return e;if(e.key instanceof Ot||e.key instanceof Ft){if(e.key.value==="__proto__")return e;if(e.key.value=="constructor"&&t.parent()instanceof et)return e;if(e instanceof je){e.key=e.key.value}else if(e instanceof tt){e.key=make_node(ht,e.key,{name:e.key.value})}else{e.key=make_node(_t,e.key,{name:e.key.value})}}return e}def_optimize($e,lift_key);def_optimize(Je,function(e,t){lift_key(e,t);if(t.option("arrows")&&t.parent()instanceof Ye&&!e.is_generator&&!e.value.uses_arguments&&!e.value.pinned()&&e.value.body.length==1&&e.value.body[0]instanceof le&&e.value.body[0].value&&!e.value.contains_this()){var n=make_node(ne,e.value,e.value);n.async=e.async;n.is_generator=e.is_generator;return make_node(je,e,{key:e.key instanceof _t?e.key.name:e.key,value:n,quote:e.quote})}return e});def_optimize(je,function(e,t){lift_key(e,t);var n=t.option("unsafe_methods");if(n&&t.option("ecma")>=2015&&(!(n instanceof RegExp)||n.test(e.key+""))){var i=e.key;var r=e.value;var a=r instanceof ne&&Array.isArray(r.body)&&!r.contains_this();if((a||r instanceof te)&&!r.name){return make_node(Je,e,{async:r.async,is_generator:r.is_generator,key:i instanceof R?i:make_node(_t,e,{name:i}),value:make_node(ee,r,r),quote:e.quote})}}return e});def_optimize(re,function(e,t){if(t.option("pure_getters")==true&&t.option("unused")&&!e.is_array&&Array.isArray(e.names)&&!is_destructuring_export_decl(t)){var n=[];for(var i=0;i<e.names.length;i++){var r=e.names[i];if(!(r instanceof je&&typeof r.key=="string"&&r.value instanceof ot&&!should_retain(t,r.value.definition()))){n.push(r)}}if(n.length!=e.names.length){e.names=n}}return e;function is_destructuring_export_decl(e){var t=[/^VarDef$/,/^(Const|Let|Var)$/,/^Export$/];for(var n=0,i=0,r=t.length;n<r;i++){var a=e.parent(i);if(!a)return false;if(n===0&&a.TYPE=="Destructuring")continue;if(!t[n].test(a.TYPE)){return false}n++}return true}function should_retain(e,t){if(t.references.length)return true;if(!t.global)return false;if(e.toplevel.vars){if(e.top_retain){return e.top_retain(t)}return false}return true}});function SourceMap(e){e=defaults(e,{file:null,root:null,orig:null,orig_line_diff:0,dest_line_diff:0});var n=new t.SourceMapGenerator({file:e.file,sourceRoot:e.root});var i=e.orig&&new t.SourceMapConsumer(e.orig);if(i){i.sources.forEach(function(e){var t=i.sourceContentFor(e,true);if(t){n.setSourceContent(e,t)}})}function add(t,r,a,o,s,u){if(i){var 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--output <file>","Output file (default STDOUT).");e.option("--comments [filter]","Preserve copyright comments in the output.");e.option("--config-file <file>","Read minify() options from JSON file.");e.option("-d, --define <expr>[=value]","Global definitions.",parse_js("define"));e.option("--ecma <version>","Specify ECMAScript release: 5, 2015, 2016 or 2017...");e.option("-e, --enclose [arg[,...][:value[,...]]]","Embed output in a big function with configurable arguments and values.");e.option("--ie8","Support non-standard Internet Explorer 8.");e.option("--keep-classnames","Do not mangle/drop class names.");e.option("--keep-fnames","Do not mangle/drop function names. Useful for code relying on Function.prototype.name.");e.option("--module","Input is an ES6 module");e.option("--name-cache <file>","File to hold mangled name mappings.");e.option("--rename","Force symbol expansion.");e.option("--no-rename","Disable symbol expansion.");e.option("--safari10","Support non-standard Safari 10.");e.option("--source-map [options]","Enable source map/specify source map options.",parse_js());e.option("--timings","Display operations run time on STDERR.");e.option("--toplevel","Compress and/or mangle variables in toplevel scope.");e.option("--wrap <name>","Embed everything as a function with “exports” corresponding to “name” globally.");e.arguments("[files...]").parseArgv(process.argv);if(e.configFile){s=JSON.parse(read_file(e.configFile))}if(!e.output&&e.sourceMap&&e.sourceMap.url!="inline"){fatal("ERROR: cannot write source map to STDOUT")}["compress","enclose","ie8","mangle","module","safari10","sourceMap","toplevel","wrap"].forEach(function(t){if(t in e){s[t]=e[t]}});if("ecma"in e){if(e.ecma!=(e.ecma|0))fatal("ERROR: ecma must be an integer");const t=e.ecma|0;if(t>5&&t<2015)s.ecma=t+2009;else s.ecma=t}if(e.beautify||e.format){if(e.beautify&&e.format){fatal("Please only specify one of --beautify or --format")}if(e.beautify){s.format=typeof e.beautify=="object"?e.beautify:{};if(!("beautify"in s.format)){s.format.beautify=true}}if(e.format){s.format=typeof e.format=="object"?e.format:{}}}if(e.comments){if(typeof s.format!="object")s.format={};s.format.comments=typeof e.comments=="string"?e.comments=="false"?false:e.comments:"some"}if(e.define){if(typeof s.compress!="object")s.compress={};if(typeof s.compress.global_defs!="object")s.compress.global_defs={};for(var c in e.define){s.compress.global_defs[c]=e.define[c]}}if(e.keepClassnames){s.keep_classnames=true}if(e.keepFnames){s.keep_fnames=true}if(e.mangleProps){if(e.mangleProps.domprops){delete e.mangleProps.domprops}else{if(typeof e.mangleProps!="object")e.mangleProps={};if(!Array.isArray(e.mangleProps.reserved))e.mangleProps.reserved=[]}if(typeof s.mangle!="object")s.mangle={};s.mangle.properties=e.mangleProps}if(e.nameCache){s.nameCache=JSON.parse(read_file(e.nameCache,"{}"))}if(e.output=="ast"){s.format={ast:true,code:false}}if(e.parse){if(!e.parse.acorn&&!e.parse.spidermonkey){s.parse=e.parse}else if(e.sourceMap&&e.sourceMap.content=="inline"){fatal("ERROR: inline source map only works with built-in parser")}}if(~e.rawArgs.indexOf("--rename")){s.rename=true}else if(!e.rename){s.rename=false}let l=e=>e;if(typeof e.sourceMap=="object"&&"base"in e.sourceMap){l=function(){var t=e.sourceMap.base;delete s.sourceMap.base;return function(e){return r.relative(t,e)}}()}let f;if(s.files&&s.files.length){f=s.files;delete s.files}else if(e.args.length){f=e.args}if(f){simple_glob(f).forEach(function(e){o[l(e)]=read_file(e)})}else{await new Promise(e=>{var t=[];process.stdin.setEncoding("utf8");process.stdin.on("data",function(e){t.push(e)}).on("end",function(){o=[t.join("")];e()});process.stdin.resume()})}await run_cli();function convert_ast(e){return R.from_mozilla_ast(Object.keys(o).reduce(e,null))}async function run_cli(){var t=e.sourceMap&&e.sourceMap.content;if(t&&t!=="inline"){s.sourceMap.content=read_file(t,t)}if(e.timings)s.timings=true;try{if(e.parse){if(e.parse.acorn){o=convert_ast(function(t,i){return n(985).parse(o[i],{ecmaVersion:2018,locations:true,program:t,sourceFile:i,sourceType:s.module||e.parse.module?"module":"script"})})}else if(e.parse.spidermonkey){o=convert_ast(function(e,t){var n=JSON.parse(o[t]);if(!e)return n;e.body=e.body.concat(n.body);return e})}}}catch(e){fatal(e)}let r;try{r=await minify(o,s)}catch(e){if(e.name=="SyntaxError"){print_error("Parse error at "+e.filename+":"+e.line+","+e.col);var u=e.col;var c=o[e.filename].split(/\r?\n/);var l=c[e.line-1];if(!l&&!u){l=c[e.line-2];u=l.length}if(l){var f=70;if(u>f){l=l.slice(u-f);u=f}print_error(l.slice(0,80));print_error(l.slice(0,u).replace(/\S/g," ")+"^")}}if(e.defs){print_error("Supported options:");print_error(format_object(e.defs))}fatal(e);return}if(e.output=="ast"){if(!s.compress&&!s.mangle){r.ast.figure_out_scope({})}console.log(JSON.stringify(r.ast,function(e,t){if(t)switch(e){case"thedef":return symdef(t);case"enclosed":return t.length?t.map(symdef):undefined;case"variables":case"functions":case"globals":return t.size?collect_from_map(t,symdef):undefined}if(a.has(e))return;if(t instanceof w)return;if(t instanceof Map)return;if(t instanceof R){var n={_class:"AST_"+t.TYPE};if(t.block_scope){n.variables=t.block_scope.variables;n.functions=t.block_scope.functions;n.enclosed=t.block_scope.enclosed}t.CTOR.PROPS.forEach(function(e){n[e]=t[e]});return n}return t},2))}else if(e.output=="spidermonkey"){try{const e=await minify(r.code,{compress:false,mangle:false,format:{ast:true,code:false}});console.log(JSON.stringify(e.ast.to_mozilla_ast(),null,2))}catch(e){fatal(e);return}}else if(e.output){i.writeFileSync(e.output,r.code);if(s.sourceMap&&s.sourceMap.url!=="inline"&&r.map){i.writeFileSync(e.output+".map",r.map)}}else{console.log(r.code)}if(e.nameCache){i.writeFileSync(e.nameCache,JSON.stringify(s.nameCache))}if(r.timings)for(var p in r.timings){print_error("- "+p+": "+r.timings[p].toFixed(3)+"s")}}function fatal(e){if(e instanceof Error)e=e.stack.replace(/^\S*?Error:/,"ERROR:");print_error(e);process.exit(1)}function simple_glob(e){if(Array.isArray(e)){return[].concat.apply([],e.map(simple_glob))}if(e&&e.match(/[*?]/)){var t=r.dirname(e);try{var n=i.readdirSync(t)}catch(e){}if(n){var a="^"+r.basename(e).replace(/[.+^$[\]\\(){}]/g,"\\$&").replace(/\*/g,"[^/\\\\]*").replace(/\?/g,"[^/\\\\]")+"$";var o=process.platform==="win32"?"i":"";var s=new RegExp(a,o);var u=n.filter(function(e){return s.test(e)}).map(function(e){return r.join(t,e)});if(u.length)return u}}return[e]}function read_file(e,t){try{return i.readFileSync(e,"utf8")}catch(e){if((e.code=="ENOENT"||e.code=="ENAMETOOLONG")&&t!=null)return t;fatal(e)}}function parse_js(e){return function(t,n){n=n||{};try{walk(parse(t,{expression:true}),t=>{if(t instanceof Xe){var i=t.left.print_to_string();var r=t.right;if(e){n[i]=r}else if(r instanceof We){n[i]=r.elements.map(to_string)}else if(r instanceof Rt){r=r.value;n[i]=new RegExp(r.source,r.flags)}else{n[i]=to_string(r)}return true}if(t instanceof rt||t instanceof Ve){var i=t.print_to_string();n[i]=true;return true}if(!(t instanceof Pe))throw t;function to_string(e){return e instanceof xt?e.getValue():e.print_to_string({quote_keys:true})}})}catch(i){if(e){fatal("Error parsing arguments for '"+e+"': "+t)}else{n[t]=null}}return n}}function symdef(e){var t=1e6+e.id+" "+e.name;if(e.mangled_name)t+=" "+e.mangled_name;return t}function collect_from_map(e,t){var n=[];e.forEach(function(e){n.push(t(e))});return n}function format_object(e){var t=[];var n="";Object.keys(e).map(function(t){if(n.length<t.length)n=Array(t.length+1).join(" ");return[t,JSON.stringify(e[t])]}).forEach(function(e){t.push("  "+e[0]+n.slice(e[0].length-2)+e[1])});return t.join("\n")}function print_error(e){process.stderr.write(e);process.stderr.write("\n")}function describe_ast(){var e=OutputStream({beautify:true});function doitem(t){e.print("AST_"+t.TYPE);const n=t.SELF_PROPS.filter(e=>!/^\$/.test(e));if(n.length>0){e.space();e.with_parens(function(){n.forEach(function(t,n){if(n)e.space();e.print(t)})})}if(t.documentation){e.space();e.print_string(t.documentation)}if(t.SUBCLASSES.length>0){e.space();e.with_block(function(){t.SUBCLASSES.forEach(function(t){e.indent();doitem(t);e.newline()})})}}doitem(R);return e+"\n"}}async function _default_options(){const e={};Object.keys(infer_options({0:0})).forEach(t=>{const n=infer_options({[t]:{0:0}});if(n)e[t]=n});return e}async function infer_options(e){try{await minify("",e)}catch(e){return e.defs}}e._default_options=_default_options;e._run_cli=run_cli;e.minify=minify})},985:function(e,t){(function(e,n){true?n(t):undefined})(this,function(e){"use strict";var t={3:"abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile",5:"class enum extends super const export import",6:"enum",strict:"implements interface let package private protected public static yield",strictBind:"eval arguments"};var n="break case catch continue debugger default do else finally for function if return switch throw try var while with null true false instanceof typeof void delete new in this";var i={5:n,"5module":n+" export import",6:n+" const class extends export import super"};var r=/^in(stanceof)?$/;var 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true};H.expectContextual=function(e){if(!this.eatContextual(e)){this.unexpected()}};H.canInsertSemicolon=function(){return this.type===d.eof||this.type===d.braceR||m.test(this.input.slice(this.lastTokEnd,this.start))};H.insertSemicolon=function(){if(this.canInsertSemicolon()){if(this.options.onInsertedSemicolon){this.options.onInsertedSemicolon(this.lastTokEnd,this.lastTokEndLoc)}return true}};H.semicolon=function(){if(!this.eat(d.semi)&&!this.insertSemicolon()){this.unexpected()}};H.afterTrailingComma=function(e,t){if(this.type===e){if(this.options.onTrailingComma){this.options.onTrailingComma(this.lastTokStart,this.lastTokStartLoc)}if(!t){this.next()}return true}};H.expect=function(e){this.eat(e)||this.unexpected()};H.unexpected=function(e){this.raise(e!=null?e:this.start,"Unexpected token")};function DestructuringErrors(){this.shorthandAssign=this.trailingComma=this.parenthesizedAssign=this.parenthesizedBind=this.doubleProto=-1}H.checkPatternErrors=function(e,t){if(!e){return}if(e.trailingComma>-1){this.raiseRecoverable(e.trailingComma,"Comma is not permitted after the rest element")}var n=t?e.parenthesizedAssign:e.parenthesizedBind;if(n>-1){this.raiseRecoverable(n,"Parenthesized pattern")}};H.checkExpressionErrors=function(e,t){if(!e){return false}var n=e.shorthandAssign;var i=e.doubleProto;if(!t){return n>=0||i>=0}if(n>=0){this.raise(n,"Shorthand property assignments are valid only in destructuring patterns")}if(i>=0){this.raiseRecoverable(i,"Redefinition of __proto__ property")}};H.checkYieldAwaitInDefaultParams=function(){if(this.yieldPos&&(!this.awaitPos||this.yieldPos<this.awaitPos)){this.raise(this.yieldPos,"Yield expression cannot be a default value")}if(this.awaitPos){this.raise(this.awaitPos,"Await expression cannot be a default value")}};H.isSimpleAssignTarget=function(e){if(e.type==="ParenthesizedExpression"){return this.isSimpleAssignTarget(e.expression)}return e.type==="Identifier"||e.type==="MemberExpression"};var q=z.prototype;q.parseTopLevel=function(e){var t={};if(!e.body){e.body=[]}while(this.type!==d.eof){var n=this.parseStatement(null,true,t);e.body.push(n)}if(this.inModule){for(var i=0,r=Object.keys(this.undefinedExports);i<r.length;i+=1){var a=r[i];this.raiseRecoverable(this.undefinedExports[a].start,"Export '"+a+"' is not defined")}}this.adaptDirectivePrologue(e.body);this.next();e.sourceType=this.options.sourceType;return this.finishNode(e,"Program")};var W={kind:"loop"},Y={kind:"switch"};q.isLet=function(e){if(this.options.ecmaVersion<6||!this.isContextual("let")){return false}v.lastIndex=this.pos;var t=v.exec(this.input);var n=this.pos+t[0].length,i=this.input.charCodeAt(n);if(i===91){return true}if(e){return false}if(i===123){return true}if(isIdentifierStart(i,true)){var a=n+1;while(isIdentifierChar(this.input.charCodeAt(a),true)){++a}var o=this.input.slice(n,a);if(!r.test(o)){return true}}return false};q.isAsyncFunction=function(){if(this.options.ecmaVersion<8||!this.isContextual("async")){return false}v.lastIndex=this.pos;var e=v.exec(this.input);var t=this.pos+e[0].length;return!m.test(this.input.slice(this.pos,t))&&this.input.slice(t,t+8)==="function"&&(t+8===this.input.length||!isIdentifierChar(this.input.charAt(t+8)))};q.parseStatement=function(e,t,n){var i=this.type,r=this.startNode(),a;if(this.isLet(e)){i=d._var;a="let"}switch(i){case d._break:case d._continue:return this.parseBreakContinueStatement(r,i.keyword);case d._debugger:return this.parseDebuggerStatement(r);case d._do:return this.parseDoStatement(r);case d._for:return this.parseForStatement(r);case d._function:if(e&&(this.strict||e!=="if"&&e!=="label")&&this.options.ecmaVersion>=6){this.unexpected()}return this.parseFunctionStatement(r,false,!e);case d._class:if(e){this.unexpected()}return this.parseClass(r,true);case d._if:return this.parseIfStatement(r);case d._return:return this.parseReturnStatement(r);case d._switch:return this.parseSwitchStatement(r);case d._throw:return this.parseThrowStatement(r);case d._try:return this.parseTryStatement(r);case d._const:case d._var:a=a||this.value;if(e&&a!=="var"){this.unexpected()}return this.parseVarStatement(r,a);case d._while:return this.parseWhileStatement(r);case d._with:return this.parseWithStatement(r);case d.braceL:return this.parseBlock(true,r);case d.semi:return this.parseEmptyStatement(r);case d._export:case d._import:if(this.options.ecmaVersion>10&&i===d._import){v.lastIndex=this.pos;var o=v.exec(this.input);var s=this.pos+o[0].length,u=this.input.charCodeAt(s);if(u===40){return this.parseExpressionStatement(r,this.parseExpression())}}if(!this.options.allowImportExportEverywhere){if(!t){this.raise(this.start,"'import' and 'export' may only appear at the top level")}if(!this.inModule){this.raise(this.start,"'import' and 'export' may appear only with 'sourceType: module'")}}return i===d._import?this.parseImport(r):this.parseExport(r,n);default:if(this.isAsyncFunction()){if(e){this.unexpected()}this.next();return this.parseFunctionStatement(r,true,!e)}var c=this.value,l=this.parseExpression();if(i===d.name&&l.type==="Identifier"&&this.eat(d.colon)){return this.parseLabeledStatement(r,c,l,e)}else{return this.parseExpressionStatement(r,l)}}};q.parseBreakContinueStatement=function(e,t){var n=t==="break";this.next();if(this.eat(d.semi)||this.insertSemicolon()){e.label=null}else if(this.type!==d.name){this.unexpected()}else{e.label=this.parseIdent();this.semicolon()}var i=0;for(;i<this.labels.length;++i){var r=this.labels[i];if(e.label==null||r.name===e.label.name){if(r.kind!=null&&(n||r.kind==="loop")){break}if(e.label&&n){break}}}if(i===this.labels.length){this.raise(e.start,"Unsyntactic "+t)}return this.finishNode(e,n?"BreakStatement":"ContinueStatement")};q.parseDebuggerStatement=function(e){this.next();this.semicolon();return this.finishNode(e,"DebuggerStatement")};q.parseDoStatement=function(e){this.next();this.labels.push(W);e.body=this.parseStatement("do");this.labels.pop();this.expect(d._while);e.test=this.parseParenExpression();if(this.options.ecmaVersion>=6){this.eat(d.semi)}else{this.semicolon()}return this.finishNode(e,"DoWhileStatement")};q.parseForStatement=function(e){this.next();var t=this.options.ecmaVersion>=9&&(this.inAsync||!this.inFunction&&this.options.allowAwaitOutsideFunction)&&this.eatContextual("await")?this.lastTokStart:-1;this.labels.push(W);this.enterScope(0);this.expect(d.parenL);if(this.type===d.semi){if(t>-1){this.unexpected(t)}return this.parseFor(e,null)}var n=this.isLet();if(this.type===d._var||this.type===d._const||n){var i=this.startNode(),r=n?"let":this.value;this.next();this.parseVar(i,true,r);this.finishNode(i,"VariableDeclaration");if((this.type===d._in||this.options.ecmaVersion>=6&&this.isContextual("of"))&&i.declarations.length===1){if(this.options.ecmaVersion>=9){if(this.type===d._in){if(t>-1){this.unexpected(t)}}else{e.await=t>-1}}return this.parseForIn(e,i)}if(t>-1){this.unexpected(t)}return this.parseFor(e,i)}var a=new DestructuringErrors;var o=this.parseExpression(true,a);if(this.type===d._in||this.options.ecmaVersion>=6&&this.isContextual("of")){if(this.options.ecmaVersion>=9){if(this.type===d._in){if(t>-1){this.unexpected(t)}}else{e.await=t>-1}}this.toAssignable(o,false,a);this.checkLVal(o);return this.parseForIn(e,o)}else{this.checkExpressionErrors(a,true)}if(t>-1){this.unexpected(t)}return this.parseFor(e,o)};q.parseFunctionStatement=function(e,t,n){this.next();return this.parseFunction(e,j|(n?0:Z),false,t)};q.parseIfStatement=function(e){this.next();e.test=this.parseParenExpression();e.consequent=this.parseStatement("if");e.alternate=this.eat(d._else)?this.parseStatement("if"):null;return this.finishNode(e,"IfStatement")};q.parseReturnStatement=function(e){if(!this.inFunction&&!this.options.allowReturnOutsideFunction){this.raise(this.start,"'return' outside of function")}this.next();if(this.eat(d.semi)||this.insertSemicolon()){e.argument=null}else{e.argument=this.parseExpression();this.semicolon()}return this.finishNode(e,"ReturnStatement")};q.parseSwitchStatement=function(e){this.next();e.discriminant=this.parseParenExpression();e.cases=[];this.expect(d.braceL);this.labels.push(Y);this.enterScope(0);var t;for(var n=false;this.type!==d.braceR;){if(this.type===d._case||this.type===d._default){var i=this.type===d._case;if(t){this.finishNode(t,"SwitchCase")}e.cases.push(t=this.startNode());t.consequent=[];this.next();if(i){t.test=this.parseExpression()}else{if(n){this.raiseRecoverable(this.lastTokStart,"Multiple default clauses")}n=true;t.test=null}this.expect(d.colon)}else{if(!t){this.unexpected()}t.consequent.push(this.parseStatement(null))}}this.exitScope();if(t){this.finishNode(t,"SwitchCase")}this.next();this.labels.pop();return this.finishNode(e,"SwitchStatement")};q.parseThrowStatement=function(e){this.next();if(m.test(this.input.slice(this.lastTokEnd,this.start))){this.raise(this.lastTokEnd,"Illegal newline after throw")}e.argument=this.parseExpression();this.semicolon();return this.finishNode(e,"ThrowStatement")};var $=[];q.parseTryStatement=function(e){this.next();e.block=this.parseBlock();e.handler=null;if(this.type===d._catch){var t=this.startNode();this.next();if(this.eat(d.parenL)){t.param=this.parseBindingAtom();var n=t.param.type==="Identifier";this.enterScope(n?M:0);this.checkLVal(t.param,n?U:L);this.expect(d.parenR)}else{if(this.options.ecmaVersion<10){this.unexpected()}t.param=null;this.enterScope(0)}t.body=this.parseBlock(false);this.exitScope();e.handler=this.finishNode(t,"CatchClause")}e.finalizer=this.eat(d._finally)?this.parseBlock():null;if(!e.handler&&!e.finalizer){this.raise(e.start,"Missing catch or finally clause")}return this.finishNode(e,"TryStatement")};q.parseVarStatement=function(e,t){this.next();this.parseVar(e,false,t);this.semicolon();return this.finishNode(e,"VariableDeclaration")};q.parseWhileStatement=function(e){this.next();e.test=this.parseParenExpression();this.labels.push(W);e.body=this.parseStatement("while");this.labels.pop();return this.finishNode(e,"WhileStatement")};q.parseWithStatement=function(e){if(this.strict){this.raise(this.start,"'with' in strict mode")}this.next();e.object=this.parseParenExpression();e.body=this.parseStatement("with");return this.finishNode(e,"WithStatement")};q.parseEmptyStatement=function(e){this.next();return this.finishNode(e,"EmptyStatement")};q.parseLabeledStatement=function(e,t,n,i){for(var r=0,a=this.labels;r<a.length;r+=1){var o=a[r];if(o.name===t){this.raise(n.start,"Label '"+t+"' is already declared")}}var s=this.type.isLoop?"loop":this.type===d._switch?"switch":null;for(var u=this.labels.length-1;u>=0;u--){var c=this.labels[u];if(c.statementStart===e.start){c.statementStart=this.start;c.kind=s}else{break}}this.labels.push({name:t,kind:s,statementStart:this.start});e.body=this.parseStatement(i?i.indexOf("label")===-1?i+"label":i:"label");this.labels.pop();e.label=n;return this.finishNode(e,"LabeledStatement")};q.parseExpressionStatement=function(e,t){e.expression=t;this.semicolon();return this.finishNode(e,"ExpressionStatement")};q.parseBlock=function(e,t){if(e===void 0)e=true;if(t===void 0)t=this.startNode();t.body=[];this.expect(d.braceL);if(e){this.enterScope(0)}while(!this.eat(d.braceR)){var n=this.parseStatement(null);t.body.push(n)}if(e){this.exitScope()}return this.finishNode(t,"BlockStatement")};q.parseFor=function(e,t){e.init=t;this.expect(d.semi);e.test=this.type===d.semi?null:this.parseExpression();this.expect(d.semi);e.update=this.type===d.parenR?null:this.parseExpression();this.expect(d.parenR);e.body=this.parseStatement("for");this.exitScope();this.labels.pop();return this.finishNode(e,"ForStatement")};q.parseForIn=function(e,t){var n=this.type===d._in;this.next();if(t.type==="VariableDeclaration"&&t.declarations[0].init!=null&&(!n||this.options.ecmaVersion<8||this.strict||t.kind!=="var"||t.declarations[0].id.type!=="Identifier")){this.raise(t.start,(n?"for-in":"for-of")+" loop variable declaration may not have an initializer")}else if(t.type==="AssignmentPattern"){this.raise(t.start,"Invalid left-hand side in for-loop")}e.left=t;e.right=n?this.parseExpression():this.parseMaybeAssign();this.expect(d.parenR);e.body=this.parseStatement("for");this.exitScope();this.labels.pop();return this.finishNode(e,n?"ForInStatement":"ForOfStatement")};q.parseVar=function(e,t,n){e.declarations=[];e.kind=n;for(;;){var i=this.startNode();this.parseVarId(i,n);if(this.eat(d.eq)){i.init=this.parseMaybeAssign(t)}else if(n==="const"&&!(this.type===d._in||this.options.ecmaVersion>=6&&this.isContextual("of"))){this.unexpected()}else if(i.id.type!=="Identifier"&&!(t&&(this.type===d._in||this.isContextual("of")))){this.raise(this.lastTokEnd,"Complex binding patterns require an initialization value")}else{i.init=null}e.declarations.push(this.finishNode(i,"VariableDeclarator"));if(!this.eat(d.comma)){break}}return e};q.parseVarId=function(e,t){e.id=this.parseBindingAtom();this.checkLVal(e.id,t==="var"?V:L,false)};var j=1,Z=2,Q=4;q.parseFunction=function(e,t,n,i){this.initFunction(e);if(this.options.ecmaVersion>=9||this.options.ecmaVersion>=6&&!i){if(this.type===d.star&&t&Z){this.unexpected()}e.generator=this.eat(d.star)}if(this.options.ecmaVersion>=8){e.async=!!i}if(t&j){e.id=t&Q&&this.type!==d.name?null:this.parseIdent();if(e.id&&!(t&Z)){this.checkLVal(e.id,this.strict||e.generator||e.async?this.treatFunctionsAsVar?V:L:B)}}var r=this.yieldPos,a=this.awaitPos,o=this.awaitIdentPos;this.yieldPos=0;this.awaitPos=0;this.awaitIdentPos=0;this.enterScope(functionFlags(e.async,e.generator));if(!(t&j)){e.id=this.type===d.name?this.parseIdent():null}this.parseFunctionParams(e);this.parseFunctionBody(e,n,false);this.yieldPos=r;this.awaitPos=a;this.awaitIdentPos=o;return this.finishNode(e,t&j?"FunctionDeclaration":"FunctionExpression")};q.parseFunctionParams=function(e){this.expect(d.parenL);e.params=this.parseBindingList(d.parenR,false,this.options.ecmaVersion>=8);this.checkYieldAwaitInDefaultParams()};q.parseClass=function(e,t){this.next();var n=this.strict;this.strict=true;this.parseClassId(e,t);this.parseClassSuper(e);var i=this.startNode();var r=false;i.body=[];this.expect(d.braceL);while(!this.eat(d.braceR)){var a=this.parseClassElement(e.superClass!==null);if(a){i.body.push(a);if(a.type==="MethodDefinition"&&a.kind==="constructor"){if(r){this.raise(a.start,"Duplicate constructor in the same class")}r=true}}}e.body=this.finishNode(i,"ClassBody");this.strict=n;return this.finishNode(e,t?"ClassDeclaration":"ClassExpression")};q.parseClassElement=function(e){var t=this;if(this.eat(d.semi)){return null}var n=this.startNode();var i=function(e,i){if(i===void 0)i=false;var r=t.start,a=t.startLoc;if(!t.eatContextual(e)){return false}if(t.type!==d.parenL&&(!i||!t.canInsertSemicolon())){return true}if(n.key){t.unexpected()}n.computed=false;n.key=t.startNodeAt(r,a);n.key.name=e;t.finishNode(n.key,"Identifier");return false};n.kind="method";n.static=i("static");var r=this.eat(d.star);var a=false;if(!r){if(this.options.ecmaVersion>=8&&i("async",true)){a=true;r=this.options.ecmaVersion>=9&&this.eat(d.star)}else if(i("get")){n.kind="get"}else if(i("set")){n.kind="set"}}if(!n.key){this.parsePropertyName(n)}var o=n.key;var s=false;if(!n.computed&&!n.static&&(o.type==="Identifier"&&o.name==="constructor"||o.type==="Literal"&&o.value==="constructor")){if(n.kind!=="method"){this.raise(o.start,"Constructor can't have get/set modifier")}if(r){this.raise(o.start,"Constructor can't be a generator")}if(a){this.raise(o.start,"Constructor can't be an async method")}n.kind="constructor";s=e}else if(n.static&&o.type==="Identifier"&&o.name==="prototype"){this.raise(o.start,"Classes may not have a static property named prototype")}this.parseClassMethod(n,r,a,s);if(n.kind==="get"&&n.value.params.length!==0){this.raiseRecoverable(n.value.start,"getter should have no params")}if(n.kind==="set"&&n.value.params.length!==1){this.raiseRecoverable(n.value.start,"setter should have exactly one param")}if(n.kind==="set"&&n.value.params[0].type==="RestElement"){this.raiseRecoverable(n.value.params[0].start,"Setter cannot use rest params")}return n};q.parseClassMethod=function(e,t,n,i){e.value=this.parseMethod(t,n,i);return this.finishNode(e,"MethodDefinition")};q.parseClassId=function(e,t){if(this.type===d.name){e.id=this.parseIdent();if(t){this.checkLVal(e.id,L,false)}}else{if(t===true){this.unexpected()}e.id=null}};q.parseClassSuper=function(e){e.superClass=this.eat(d._extends)?this.parseExprSubscripts():null};q.parseExport=function(e,t){this.next();if(this.eat(d.star)){this.expectContextual("from");if(this.type!==d.string){this.unexpected()}e.source=this.parseExprAtom();this.semicolon();return this.finishNode(e,"ExportAllDeclaration")}if(this.eat(d._default)){this.checkExport(t,"default",this.lastTokStart);var n;if(this.type===d._function||(n=this.isAsyncFunction())){var i=this.startNode();this.next();if(n){this.next()}e.declaration=this.parseFunction(i,j|Q,false,n)}else if(this.type===d._class){var r=this.startNode();e.declaration=this.parseClass(r,"nullableID")}else{e.declaration=this.parseMaybeAssign();this.semicolon()}return this.finishNode(e,"ExportDefaultDeclaration")}if(this.shouldParseExportStatement()){e.declaration=this.parseStatement(null);if(e.declaration.type==="VariableDeclaration"){this.checkVariableExport(t,e.declaration.declarations)}else{this.checkExport(t,e.declaration.id.name,e.declaration.id.start)}e.specifiers=[];e.source=null}else{e.declaration=null;e.specifiers=this.parseExportSpecifiers(t);if(this.eatContextual("from")){if(this.type!==d.string){this.unexpected()}e.source=this.parseExprAtom()}else{for(var a=0,o=e.specifiers;a<o.length;a+=1){var s=o[a];this.checkUnreserved(s.local);this.checkLocalExport(s.local)}e.source=null}this.semicolon()}return this.finishNode(e,"ExportNamedDeclaration")};q.checkExport=function(e,t,n){if(!e){return}if(has(e,t)){this.raiseRecoverable(n,"Duplicate export '"+t+"'")}e[t]=true};q.checkPatternExport=function(e,t){var n=t.type;if(n==="Identifier"){this.checkExport(e,t.name,t.start)}else if(n==="ObjectPattern"){for(var i=0,r=t.properties;i<r.length;i+=1){var a=r[i];this.checkPatternExport(e,a)}}else if(n==="ArrayPattern"){for(var o=0,s=t.elements;o<s.length;o+=1){var u=s[o];if(u){this.checkPatternExport(e,u)}}}else if(n==="Property"){this.checkPatternExport(e,t.value)}else if(n==="AssignmentPattern"){this.checkPatternExport(e,t.left)}else if(n==="RestElement"){this.checkPatternExport(e,t.argument)}else if(n==="ParenthesizedExpression"){this.checkPatternExport(e,t.expression)}};q.checkVariableExport=function(e,t){if(!e){return}for(var n=0,i=t;n<i.length;n+=1){var r=i[n];this.checkPatternExport(e,r.id)}};q.shouldParseExportStatement=function(){return this.type.keyword==="var"||this.type.keyword==="const"||this.type.keyword==="class"||this.type.keyword==="function"||this.isLet()||this.isAsyncFunction()};q.parseExportSpecifiers=function(e){var t=[],n=true;this.expect(d.braceL);while(!this.eat(d.braceR)){if(!n){this.expect(d.comma);if(this.afterTrailingComma(d.braceR)){break}}else{n=false}var i=this.startNode();i.local=this.parseIdent(true);i.exported=this.eatContextual("as")?this.parseIdent(true):i.local;this.checkExport(e,i.exported.name,i.exported.start);t.push(this.finishNode(i,"ExportSpecifier"))}return t};q.parseImport=function(e){this.next();if(this.type===d.string){e.specifiers=$;e.source=this.parseExprAtom()}else{e.specifiers=this.parseImportSpecifiers();this.expectContextual("from");e.source=this.type===d.string?this.parseExprAtom():this.unexpected()}this.semicolon();return this.finishNode(e,"ImportDeclaration")};q.parseImportSpecifiers=function(){var e=[],t=true;if(this.type===d.name){var n=this.startNode();n.local=this.parseIdent();this.checkLVal(n.local,L);e.push(this.finishNode(n,"ImportDefaultSpecifier"));if(!this.eat(d.comma)){return e}}if(this.type===d.star){var i=this.startNode();this.next();this.expectContextual("as");i.local=this.parseIdent();this.checkLVal(i.local,L);e.push(this.finishNode(i,"ImportNamespaceSpecifier"));return e}this.expect(d.braceL);while(!this.eat(d.braceR)){if(!t){this.expect(d.comma);if(this.afterTrailingComma(d.braceR)){break}}else{t=false}var r=this.startNode();r.imported=this.parseIdent(true);if(this.eatContextual("as")){r.local=this.parseIdent()}else{this.checkUnreserved(r.imported);r.local=r.imported}this.checkLVal(r.local,L);e.push(this.finishNode(r,"ImportSpecifier"))}return e};q.adaptDirectivePrologue=function(e){for(var t=0;t<e.length&&this.isDirectiveCandidate(e[t]);++t){e[t].directive=e[t].expression.raw.slice(1,-1)}};q.isDirectiveCandidate=function(e){return e.type==="ExpressionStatement"&&e.expression.type==="Literal"&&typeof e.expression.value==="string"&&(this.input[e.start]==='"'||this.input[e.start]==="'")};var J=z.prototype;J.toAssignable=function(e,t,n){if(this.options.ecmaVersion>=6&&e){switch(e.type){case"Identifier":if(this.inAsync&&e.name==="await"){this.raise(e.start,"Cannot use 'await' as identifier inside an async function")}break;case"ObjectPattern":case"ArrayPattern":case"RestElement":break;case"ObjectExpression":e.type="ObjectPattern";if(n){this.checkPatternErrors(n,true)}for(var i=0,r=e.properties;i<r.length;i+=1){var a=r[i];this.toAssignable(a,t);if(a.type==="RestElement"&&(a.argument.type==="ArrayPattern"||a.argument.type==="ObjectPattern")){this.raise(a.argument.start,"Unexpected token")}}break;case"Property":if(e.kind!=="init"){this.raise(e.key.start,"Object pattern can't contain getter or setter")}this.toAssignable(e.value,t);break;case"ArrayExpression":e.type="ArrayPattern";if(n){this.checkPatternErrors(n,true)}this.toAssignableList(e.elements,t);break;case"SpreadElement":e.type="RestElement";this.toAssignable(e.argument,t);if(e.argument.type==="AssignmentPattern"){this.raise(e.argument.start,"Rest elements cannot have a default value")}break;case"AssignmentExpression":if(e.operator!=="="){this.raise(e.left.end,"Only '=' operator can be used for specifying default value.")}e.type="AssignmentPattern";delete e.operator;this.toAssignable(e.left,t);case"AssignmentPattern":break;case"ParenthesizedExpression":this.toAssignable(e.expression,t,n);break;case"MemberExpression":if(!t){break}default:this.raise(e.start,"Assigning to rvalue")}}else if(n){this.checkPatternErrors(n,true)}return e};J.toAssignableList=function(e,t){var n=e.length;for(var i=0;i<n;i++){var r=e[i];if(r){this.toAssignable(r,t)}}if(n){var a=e[n-1];if(this.options.ecmaVersion===6&&t&&a&&a.type==="RestElement"&&a.argument.type!=="Identifier"){this.unexpected(a.argument.start)}}return e};J.parseSpread=function(e){var t=this.startNode();this.next();t.argument=this.parseMaybeAssign(false,e);return this.finishNode(t,"SpreadElement")};J.parseRestBinding=function(){var e=this.startNode();this.next();if(this.options.ecmaVersion===6&&this.type!==d.name){this.unexpected()}e.argument=this.parseBindingAtom();return this.finishNode(e,"RestElement")};J.parseBindingAtom=function(){if(this.options.ecmaVersion>=6){switch(this.type){case d.bracketL:var e=this.startNode();this.next();e.elements=this.parseBindingList(d.bracketR,true,true);return this.finishNode(e,"ArrayPattern");case d.braceL:return this.parseObj(true)}}return this.parseIdent()};J.parseBindingList=function(e,t,n){var i=[],r=true;while(!this.eat(e)){if(r){r=false}else{this.expect(d.comma)}if(t&&this.type===d.comma){i.push(null)}else if(n&&this.afterTrailingComma(e)){break}else if(this.type===d.ellipsis){var a=this.parseRestBinding();this.parseBindingListItem(a);i.push(a);if(this.type===d.comma){this.raise(this.start,"Comma is not permitted after the rest element")}this.expect(e);break}else{var o=this.parseMaybeDefault(this.start,this.startLoc);this.parseBindingListItem(o);i.push(o)}}return i};J.parseBindingListItem=function(e){return e};J.parseMaybeDefault=function(e,t,n){n=n||this.parseBindingAtom();if(this.options.ecmaVersion<6||!this.eat(d.eq)){return n}var i=this.startNodeAt(e,t);i.left=n;i.right=this.parseMaybeAssign();return this.finishNode(i,"AssignmentPattern")};J.checkLVal=function(e,t,n){if(t===void 0)t=P;switch(e.type){case"Identifier":if(t===L&&e.name==="let"){this.raiseRecoverable(e.start,"let is disallowed as a lexically bound name")}if(this.strict&&this.reservedWordsStrictBind.test(e.name)){this.raiseRecoverable(e.start,(t?"Binding ":"Assigning to ")+e.name+" in strict mode")}if(n){if(has(n,e.name)){this.raiseRecoverable(e.start,"Argument name clash")}n[e.name]=true}if(t!==P&&t!==K){this.declareName(e.name,t,e.start)}break;case"MemberExpression":if(t){this.raiseRecoverable(e.start,"Binding member expression")}break;case"ObjectPattern":for(var i=0,r=e.properties;i<r.length;i+=1){var a=r[i];this.checkLVal(a,t,n)}break;case"Property":this.checkLVal(e.value,t,n);break;case"ArrayPattern":for(var o=0,s=e.elements;o<s.length;o+=1){var u=s[o];if(u){this.checkLVal(u,t,n)}}break;case"AssignmentPattern":this.checkLVal(e.left,t,n);break;case"RestElement":this.checkLVal(e.argument,t,n);break;case"ParenthesizedExpression":this.checkLVal(e.expression,t,n);break;default:this.raise(e.start,(t?"Binding":"Assigning to")+" rvalue")}};var ee=z.prototype;ee.checkPropClash=function(e,t,n){if(this.options.ecmaVersion>=9&&e.type==="SpreadElement"){return}if(this.options.ecmaVersion>=6&&(e.computed||e.method||e.shorthand)){return}var i=e.key;var r;switch(i.type){case"Identifier":r=i.name;break;case"Literal":r=String(i.value);break;default:return}var a=e.kind;if(this.options.ecmaVersion>=6){if(r==="__proto__"&&a==="init"){if(t.proto){if(n){if(n.doubleProto<0){n.doubleProto=i.start}}else{this.raiseRecoverable(i.start,"Redefinition of __proto__ property")}}t.proto=true}return}r="$"+r;var o=t[r];if(o){var s;if(a==="init"){s=this.strict&&o.init||o.get||o.set}else{s=o.init||o[a]}if(s){this.raiseRecoverable(i.start,"Redefinition of property")}}else{o=t[r]={init:false,get:false,set:false}}o[a]=true};ee.parseExpression=function(e,t){var n=this.start,i=this.startLoc;var r=this.parseMaybeAssign(e,t);if(this.type===d.comma){var a=this.startNodeAt(n,i);a.expressions=[r];while(this.eat(d.comma)){a.expressions.push(this.parseMaybeAssign(e,t))}return this.finishNode(a,"SequenceExpression")}return r};ee.parseMaybeAssign=function(e,t,n){if(this.isContextual("yield")){if(this.inGenerator){return this.parseYield(e)}else{this.exprAllowed=false}}var i=false,r=-1,a=-1;if(t){r=t.parenthesizedAssign;a=t.trailingComma;t.parenthesizedAssign=t.trailingComma=-1}else{t=new DestructuringErrors;i=true}var o=this.start,s=this.startLoc;if(this.type===d.parenL||this.type===d.name){this.potentialArrowAt=this.start}var u=this.parseMaybeConditional(e,t);if(n){u=n.call(this,u,o,s)}if(this.type.isAssign){var c=this.startNodeAt(o,s);c.operator=this.value;c.left=this.type===d.eq?this.toAssignable(u,false,t):u;if(!i){t.parenthesizedAssign=t.trailingComma=t.doubleProto=-1}if(t.shorthandAssign>=c.left.start){t.shorthandAssign=-1}this.checkLVal(u);this.next();c.right=this.parseMaybeAssign(e);return this.finishNode(c,"AssignmentExpression")}else{if(i){this.checkExpressionErrors(t,true)}}if(r>-1){t.parenthesizedAssign=r}if(a>-1){t.trailingComma=a}return u};ee.parseMaybeConditional=function(e,t){var n=this.start,i=this.startLoc;var r=this.parseExprOps(e,t);if(this.checkExpressionErrors(t)){return r}if(this.eat(d.question)){var a=this.startNodeAt(n,i);a.test=r;a.consequent=this.parseMaybeAssign();this.expect(d.colon);a.alternate=this.parseMaybeAssign(e);return this.finishNode(a,"ConditionalExpression")}return r};ee.parseExprOps=function(e,t){var n=this.start,i=this.startLoc;var r=this.parseMaybeUnary(t,false);if(this.checkExpressionErrors(t)){return r}return r.start===n&&r.type==="ArrowFunctionExpression"?r:this.parseExprOp(r,n,i,-1,e)};ee.parseExprOp=function(e,t,n,i,r){var a=this.type.binop;if(a!=null&&(!r||this.type!==d._in)){if(a>i){var o=this.type===d.logicalOR||this.type===d.logicalAND;var s=this.value;this.next();var u=this.start,c=this.startLoc;var l=this.parseExprOp(this.parseMaybeUnary(null,false),u,c,a,r);var f=this.buildBinary(t,n,e,l,s,o);return this.parseExprOp(f,t,n,i,r)}}return e};ee.buildBinary=function(e,t,n,i,r,a){var o=this.startNodeAt(e,t);o.left=n;o.operator=r;o.right=i;return this.finishNode(o,a?"LogicalExpression":"BinaryExpression")};ee.parseMaybeUnary=function(e,t){var n=this.start,i=this.startLoc,r;if(this.isContextual("await")&&(this.inAsync||!this.inFunction&&this.options.allowAwaitOutsideFunction)){r=this.parseAwait();t=true}else if(this.type.prefix){var a=this.startNode(),o=this.type===d.incDec;a.operator=this.value;a.prefix=true;this.next();a.argument=this.parseMaybeUnary(null,true);this.checkExpressionErrors(e,true);if(o){this.checkLVal(a.argument)}else if(this.strict&&a.operator==="delete"&&a.argument.type==="Identifier"){this.raiseRecoverable(a.start,"Deleting local variable in strict mode")}else{t=true}r=this.finishNode(a,o?"UpdateExpression":"UnaryExpression")}else{r=this.parseExprSubscripts(e);if(this.checkExpressionErrors(e)){return r}while(this.type.postfix&&!this.canInsertSemicolon()){var s=this.startNodeAt(n,i);s.operator=this.value;s.prefix=false;s.argument=r;this.checkLVal(r);this.next();r=this.finishNode(s,"UpdateExpression")}}if(!t&&this.eat(d.starstar)){return this.buildBinary(n,i,r,this.parseMaybeUnary(null,false),"**",false)}else{return r}};ee.parseExprSubscripts=function(e){var t=this.start,n=this.startLoc;var i=this.parseExprAtom(e);if(i.type==="ArrowFunctionExpression"&&this.input.slice(this.lastTokStart,this.lastTokEnd)!==")"){return i}var r=this.parseSubscripts(i,t,n);if(e&&r.type==="MemberExpression"){if(e.parenthesizedAssign>=r.start){e.parenthesizedAssign=-1}if(e.parenthesizedBind>=r.start){e.parenthesizedBind=-1}}return r};ee.parseSubscripts=function(e,t,n,i){var r=this.options.ecmaVersion>=8&&e.type==="Identifier"&&e.name==="async"&&this.lastTokEnd===e.end&&!this.canInsertSemicolon()&&this.input.slice(e.start,e.end)==="async";while(true){var a=this.parseSubscript(e,t,n,i,r);if(a===e||a.type==="ArrowFunctionExpression"){return a}e=a}};ee.parseSubscript=function(e,t,n,i,r){var a=this.eat(d.bracketL);if(a||this.eat(d.dot)){var o=this.startNodeAt(t,n);o.object=e;o.property=a?this.parseExpression():this.parseIdent(this.options.allowReserved!=="never");o.computed=!!a;if(a){this.expect(d.bracketR)}e=this.finishNode(o,"MemberExpression")}else if(!i&&this.eat(d.parenL)){var s=new DestructuringErrors,u=this.yieldPos,c=this.awaitPos,l=this.awaitIdentPos;this.yieldPos=0;this.awaitPos=0;this.awaitIdentPos=0;var f=this.parseExprList(d.parenR,this.options.ecmaVersion>=8,false,s);if(r&&!this.canInsertSemicolon()&&this.eat(d.arrow)){this.checkPatternErrors(s,false);this.checkYieldAwaitInDefaultParams();if(this.awaitIdentPos>0){this.raise(this.awaitIdentPos,"Cannot use 'await' as identifier inside an async function")}this.yieldPos=u;this.awaitPos=c;this.awaitIdentPos=l;return this.parseArrowExpression(this.startNodeAt(t,n),f,true)}this.checkExpressionErrors(s,true);this.yieldPos=u||this.yieldPos;this.awaitPos=c||this.awaitPos;this.awaitIdentPos=l||this.awaitIdentPos;var p=this.startNodeAt(t,n);p.callee=e;p.arguments=f;e=this.finishNode(p,"CallExpression")}else if(this.type===d.backQuote){var _=this.startNodeAt(t,n);_.tag=e;_.quasi=this.parseTemplate({isTagged:true});e=this.finishNode(_,"TaggedTemplateExpression")}return e};ee.parseExprAtom=function(e){if(this.type===d.slash){this.readRegexp()}var t,n=this.potentialArrowAt===this.start;switch(this.type){case d._super:if(!this.allowSuper){this.raise(this.start,"'super' keyword outside a method")}t=this.startNode();this.next();if(this.type===d.parenL&&!this.allowDirectSuper){this.raise(t.start,"super() call outside constructor of a subclass")}if(this.type!==d.dot&&this.type!==d.bracketL&&this.type!==d.parenL){this.unexpected()}return this.finishNode(t,"Super");case d._this:t=this.startNode();this.next();return this.finishNode(t,"ThisExpression");case d.name:var i=this.start,r=this.startLoc,a=this.containsEsc;var o=this.parseIdent(false);if(this.options.ecmaVersion>=8&&!a&&o.name==="async"&&!this.canInsertSemicolon()&&this.eat(d._function)){return this.parseFunction(this.startNodeAt(i,r),0,false,true)}if(n&&!this.canInsertSemicolon()){if(this.eat(d.arrow)){return this.parseArrowExpression(this.startNodeAt(i,r),[o],false)}if(this.options.ecmaVersion>=8&&o.name==="async"&&this.type===d.name&&!a){o=this.parseIdent(false);if(this.canInsertSemicolon()||!this.eat(d.arrow)){this.unexpected()}return this.parseArrowExpression(this.startNodeAt(i,r),[o],true)}}return o;case d.regexp:var s=this.value;t=this.parseLiteral(s.value);t.regex={pattern:s.pattern,flags:s.flags};return t;case d.num:case d.string:return this.parseLiteral(this.value);case d._null:case d._true:case d._false:t=this.startNode();t.value=this.type===d._null?null:this.type===d._true;t.raw=this.type.keyword;this.next();return this.finishNode(t,"Literal");case d.parenL:var u=this.start,c=this.parseParenAndDistinguishExpression(n);if(e){if(e.parenthesizedAssign<0&&!this.isSimpleAssignTarget(c)){e.parenthesizedAssign=u}if(e.parenthesizedBind<0){e.parenthesizedBind=u}}return c;case d.bracketL:t=this.startNode();this.next();t.elements=this.parseExprList(d.bracketR,true,true,e);return this.finishNode(t,"ArrayExpression");case d.braceL:return this.parseObj(false,e);case d._function:t=this.startNode();this.next();return this.parseFunction(t,0);case d._class:return this.parseClass(this.startNode(),false);case d._new:return this.parseNew();case d.backQuote:return this.parseTemplate();case d._import:if(this.options.ecmaVersion>=11){return this.parseExprImport()}else{return this.unexpected()}default:this.unexpected()}};ee.parseExprImport=function(){var e=this.startNode();this.next();switch(this.type){case d.parenL:return this.parseDynamicImport(e);default:this.unexpected()}};ee.parseDynamicImport=function(e){this.next();e.source=this.parseMaybeAssign();if(!this.eat(d.parenR)){var t=this.start;if(this.eat(d.comma)&&this.eat(d.parenR)){this.raiseRecoverable(t,"Trailing comma is not allowed in import()")}else{this.unexpected(t)}}return this.finishNode(e,"ImportExpression")};ee.parseLiteral=function(e){var t=this.startNode();t.value=e;t.raw=this.input.slice(this.start,this.end);if(t.raw.charCodeAt(t.raw.length-1)===110){t.bigint=t.raw.slice(0,-1)}this.next();return this.finishNode(t,"Literal")};ee.parseParenExpression=function(){this.expect(d.parenL);var e=this.parseExpression();this.expect(d.parenR);return e};ee.parseParenAndDistinguishExpression=function(e){var t=this.start,n=this.startLoc,i,r=this.options.ecmaVersion>=8;if(this.options.ecmaVersion>=6){this.next();var a=this.start,o=this.startLoc;var s=[],u=true,c=false;var l=new DestructuringErrors,f=this.yieldPos,p=this.awaitPos,_;this.yieldPos=0;this.awaitPos=0;while(this.type!==d.parenR){u?u=false:this.expect(d.comma);if(r&&this.afterTrailingComma(d.parenR,true)){c=true;break}else if(this.type===d.ellipsis){_=this.start;s.push(this.parseParenItem(this.parseRestBinding()));if(this.type===d.comma){this.raise(this.start,"Comma is not permitted after the rest element")}break}else{s.push(this.parseMaybeAssign(false,l,this.parseParenItem))}}var h=this.start,m=this.startLoc;this.expect(d.parenR);if(e&&!this.canInsertSemicolon()&&this.eat(d.arrow)){this.checkPatternErrors(l,false);this.checkYieldAwaitInDefaultParams();this.yieldPos=f;this.awaitPos=p;return this.parseParenArrowList(t,n,s)}if(!s.length||c){this.unexpected(this.lastTokStart)}if(_){this.unexpected(_)}this.checkExpressionErrors(l,true);this.yieldPos=f||this.yieldPos;this.awaitPos=p||this.awaitPos;if(s.length>1){i=this.startNodeAt(a,o);i.expressions=s;this.finishNodeAt(i,"SequenceExpression",h,m)}else{i=s[0]}}else{i=this.parseParenExpression()}if(this.options.preserveParens){var E=this.startNodeAt(t,n);E.expression=i;return this.finishNode(E,"ParenthesizedExpression")}else{return i}};ee.parseParenItem=function(e){return e};ee.parseParenArrowList=function(e,t,n){return this.parseArrowExpression(this.startNodeAt(e,t),n)};var te=[];ee.parseNew=function(){if(this.containsEsc){this.raiseRecoverable(this.start,"Escape sequence in keyword new")}var e=this.startNode();var t=this.parseIdent(true);if(this.options.ecmaVersion>=6&&this.eat(d.dot)){e.meta=t;var n=this.containsEsc;e.property=this.parseIdent(true);if(e.property.name!=="target"||n){this.raiseRecoverable(e.property.start,"The only valid meta property for new is new.target")}if(!this.inNonArrowFunction()){this.raiseRecoverable(e.start,"new.target can only be used in functions")}return this.finishNode(e,"MetaProperty")}var i=this.start,r=this.startLoc,a=this.type===d._import;e.callee=this.parseSubscripts(this.parseExprAtom(),i,r,true);if(a&&e.callee.type==="ImportExpression"){this.raise(i,"Cannot use new with import()")}if(this.eat(d.parenL)){e.arguments=this.parseExprList(d.parenR,this.options.ecmaVersion>=8,false)}else{e.arguments=te}return this.finishNode(e,"NewExpression")};ee.parseTemplateElement=function(e){var t=e.isTagged;var n=this.startNode();if(this.type===d.invalidTemplate){if(!t){this.raiseRecoverable(this.start,"Bad escape sequence in untagged template literal")}n.value={raw:this.value,cooked:null}}else{n.value={raw:this.input.slice(this.start,this.end).replace(/\r\n?/g,"\n"),cooked:this.value}}this.next();n.tail=this.type===d.backQuote;return this.finishNode(n,"TemplateElement")};ee.parseTemplate=function(e){if(e===void 0)e={};var t=e.isTagged;if(t===void 0)t=false;var n=this.startNode();this.next();n.expressions=[];var i=this.parseTemplateElement({isTagged:t});n.quasis=[i];while(!i.tail){if(this.type===d.eof){this.raise(this.pos,"Unterminated template literal")}this.expect(d.dollarBraceL);n.expressions.push(this.parseExpression());this.expect(d.braceR);n.quasis.push(i=this.parseTemplateElement({isTagged:t}))}this.next();return this.finishNode(n,"TemplateLiteral")};ee.isAsyncProp=function(e){return!e.computed&&e.key.type==="Identifier"&&e.key.name==="async"&&(this.type===d.name||this.type===d.num||this.type===d.string||this.type===d.bracketL||this.type.keyword||this.options.ecmaVersion>=9&&this.type===d.star)&&!m.test(this.input.slice(this.lastTokEnd,this.start))};ee.parseObj=function(e,t){var n=this.startNode(),i=true,r={};n.properties=[];this.next();while(!this.eat(d.braceR)){if(!i){this.expect(d.comma);if(this.options.ecmaVersion>=5&&this.afterTrailingComma(d.braceR)){break}}else{i=false}var a=this.parseProperty(e,t);if(!e){this.checkPropClash(a,r,t)}n.properties.push(a)}return this.finishNode(n,e?"ObjectPattern":"ObjectExpression")};ee.parseProperty=function(e,t){var n=this.startNode(),i,r,a,o;if(this.options.ecmaVersion>=9&&this.eat(d.ellipsis)){if(e){n.argument=this.parseIdent(false);if(this.type===d.comma){this.raise(this.start,"Comma is not permitted after the rest element")}return this.finishNode(n,"RestElement")}if(this.type===d.parenL&&t){if(t.parenthesizedAssign<0){t.parenthesizedAssign=this.start}if(t.parenthesizedBind<0){t.parenthesizedBind=this.start}}n.argument=this.parseMaybeAssign(false,t);if(this.type===d.comma&&t&&t.trailingComma<0){t.trailingComma=this.start}return this.finishNode(n,"SpreadElement")}if(this.options.ecmaVersion>=6){n.method=false;n.shorthand=false;if(e||t){a=this.start;o=this.startLoc}if(!e){i=this.eat(d.star)}}var s=this.containsEsc;this.parsePropertyName(n);if(!e&&!s&&this.options.ecmaVersion>=8&&!i&&this.isAsyncProp(n)){r=true;i=this.options.ecmaVersion>=9&&this.eat(d.star);this.parsePropertyName(n,t)}else{r=false}this.parsePropertyValue(n,e,i,r,a,o,t,s);return this.finishNode(n,"Property")};ee.parsePropertyValue=function(e,t,n,i,r,a,o,s){if((n||i)&&this.type===d.colon){this.unexpected()}if(this.eat(d.colon)){e.value=t?this.parseMaybeDefault(this.start,this.startLoc):this.parseMaybeAssign(false,o);e.kind="init"}else if(this.options.ecmaVersion>=6&&this.type===d.parenL){if(t){this.unexpected()}e.kind="init";e.method=true;e.value=this.parseMethod(n,i)}else if(!t&&!s&&this.options.ecmaVersion>=5&&!e.computed&&e.key.type==="Identifier"&&(e.key.name==="get"||e.key.name==="set")&&(this.type!==d.comma&&this.type!==d.braceR)){if(n||i){this.unexpected()}e.kind=e.key.name;this.parsePropertyName(e);e.value=this.parseMethod(false);var u=e.kind==="get"?0:1;if(e.value.params.length!==u){var c=e.value.start;if(e.kind==="get"){this.raiseRecoverable(c,"getter should have no params")}else{this.raiseRecoverable(c,"setter should have exactly one param")}}else{if(e.kind==="set"&&e.value.params[0].type==="RestElement"){this.raiseRecoverable(e.value.params[0].start,"Setter cannot use rest params")}}}else if(this.options.ecmaVersion>=6&&!e.computed&&e.key.type==="Identifier"){if(n||i){this.unexpected()}this.checkUnreserved(e.key);if(e.key.name==="await"&&!this.awaitIdentPos){this.awaitIdentPos=r}e.kind="init";if(t){e.value=this.parseMaybeDefault(r,a,e.key)}else if(this.type===d.eq&&o){if(o.shorthandAssign<0){o.shorthandAssign=this.start}e.value=this.parseMaybeDefault(r,a,e.key)}else{e.value=e.key}e.shorthand=true}else{this.unexpected()}};ee.parsePropertyName=function(e){if(this.options.ecmaVersion>=6){if(this.eat(d.bracketL)){e.computed=true;e.key=this.parseMaybeAssign();this.expect(d.bracketR);return e.key}else{e.computed=false}}return e.key=this.type===d.num||this.type===d.string?this.parseExprAtom():this.parseIdent(this.options.allowReserved!=="never")};ee.initFunction=function(e){e.id=null;if(this.options.ecmaVersion>=6){e.generator=e.expression=false}if(this.options.ecmaVersion>=8){e.async=false}};ee.parseMethod=function(e,t,n){var i=this.startNode(),r=this.yieldPos,a=this.awaitPos,o=this.awaitIdentPos;this.initFunction(i);if(this.options.ecmaVersion>=6){i.generator=e}if(this.options.ecmaVersion>=8){i.async=!!t}this.yieldPos=0;this.awaitPos=0;this.awaitIdentPos=0;this.enterScope(functionFlags(t,i.generator)|N|(n?I:0));this.expect(d.parenL);i.params=this.parseBindingList(d.parenR,false,this.options.ecmaVersion>=8);this.checkYieldAwaitInDefaultParams();this.parseFunctionBody(i,false,true);this.yieldPos=r;this.awaitPos=a;this.awaitIdentPos=o;return this.finishNode(i,"FunctionExpression")};ee.parseArrowExpression=function(e,t,n){var i=this.yieldPos,r=this.awaitPos,a=this.awaitIdentPos;this.enterScope(functionFlags(n,false)|R);this.initFunction(e);if(this.options.ecmaVersion>=8){e.async=!!n}this.yieldPos=0;this.awaitPos=0;this.awaitIdentPos=0;e.params=this.toAssignableList(t,true);this.parseFunctionBody(e,true,false);this.yieldPos=i;this.awaitPos=r;this.awaitIdentPos=a;return this.finishNode(e,"ArrowFunctionExpression")};ee.parseFunctionBody=function(e,t,n){var i=t&&this.type!==d.braceL;var r=this.strict,a=false;if(i){e.body=this.parseMaybeAssign();e.expression=true;this.checkParams(e,false)}else{var o=this.options.ecmaVersion>=7&&!this.isSimpleParamList(e.params);if(!r||o){a=this.strictDirective(this.end);if(a&&o){this.raiseRecoverable(e.start,"Illegal 'use strict' directive in function with non-simple parameter list")}}var s=this.labels;this.labels=[];if(a){this.strict=true}this.checkParams(e,!r&&!a&&!t&&!n&&this.isSimpleParamList(e.params));e.body=this.parseBlock(false);e.expression=false;this.adaptDirectivePrologue(e.body.body);this.labels=s}this.exitScope();if(this.strict&&e.id){this.checkLVal(e.id,K)}this.strict=r};ee.isSimpleParamList=function(e){for(var t=0,n=e;t<n.length;t+=1){var i=n[t];if(i.type!=="Identifier"){return false}}return true};ee.checkParams=function(e,t){var n={};for(var i=0,r=e.params;i<r.length;i+=1){var a=r[i];this.checkLVal(a,V,t?null:n)}};ee.parseExprList=function(e,t,n,i){var r=[],a=true;while(!this.eat(e)){if(!a){this.expect(d.comma);if(t&&this.afterTrailingComma(e)){break}}else{a=false}var o=void 0;if(n&&this.type===d.comma){o=null}else if(this.type===d.ellipsis){o=this.parseSpread(i);if(i&&this.type===d.comma&&i.trailingComma<0){i.trailingComma=this.start}}else{o=this.parseMaybeAssign(false,i)}r.push(o)}return r};ee.checkUnreserved=function(e){var t=e.start;var n=e.end;var i=e.name;if(this.inGenerator&&i==="yield"){this.raiseRecoverable(t,"Cannot use 'yield' as identifier inside a generator")}if(this.inAsync&&i==="await"){this.raiseRecoverable(t,"Cannot use 'await' as identifier inside an async function")}if(this.keywords.test(i)){this.raise(t,"Unexpected keyword '"+i+"'")}if(this.options.ecmaVersion<6&&this.input.slice(t,n).indexOf("\\")!==-1){return}var r=this.strict?this.reservedWordsStrict:this.reservedWords;if(r.test(i)){if(!this.inAsync&&i==="await"){this.raiseRecoverable(t,"Cannot use keyword 'await' outside an async function")}this.raiseRecoverable(t,"The keyword '"+i+"' is reserved")}};ee.parseIdent=function(e,t){var n=this.startNode();if(this.type===d.name){n.name=this.value}else if(this.type.keyword){n.name=this.type.keyword;if((n.name==="class"||n.name==="function")&&(this.lastTokEnd!==this.lastTokStart+1||this.input.charCodeAt(this.lastTokStart)!==46)){this.context.pop()}}else{this.unexpected()}this.next(!!e);this.finishNode(n,"Identifier");if(!e){this.checkUnreserved(n);if(n.name==="await"&&!this.awaitIdentPos){this.awaitIdentPos=n.start}}return n};ee.parseYield=function(e){if(!this.yieldPos){this.yieldPos=this.start}var t=this.startNode();this.next();if(this.type===d.semi||this.canInsertSemicolon()||this.type!==d.star&&!this.type.startsExpr){t.delegate=false;t.argument=null}else{t.delegate=this.eat(d.star);t.argument=this.parseMaybeAssign(e)}return this.finishNode(t,"YieldExpression")};ee.parseAwait=function(){if(!this.awaitPos){this.awaitPos=this.start}var e=this.startNode();this.next();e.argument=this.parseMaybeUnary(null,false);return this.finishNode(e,"AwaitExpression")};var ne=z.prototype;ne.raise=function(e,t){var n=getLineInfo(this.input,e);t+=" ("+n.line+":"+n.column+")";var i=new SyntaxError(t);i.pos=e;i.loc=n;i.raisedAt=this.pos;throw i};ne.raiseRecoverable=ne.raise;ne.curPosition=function(){if(this.options.locations){return new S(this.curLine,this.pos-this.lineStart)}};var ie=z.prototype;var re=function Scope(e){this.flags=e;this.var=[];this.lexical=[];this.functions=[]};ie.enterScope=function(e){this.scopeStack.push(new re(e))};ie.exitScope=function(){this.scopeStack.pop()};ie.treatFunctionsAsVarInScope=function(e){return e.flags&x||!this.inModule&&e.flags&C};ie.declareName=function(e,t,n){var i=false;if(t===L){var r=this.currentScope();i=r.lexical.indexOf(e)>-1||r.functions.indexOf(e)>-1||r.var.indexOf(e)>-1;r.lexical.push(e);if(this.inModule&&r.flags&C){delete this.undefinedExports[e]}}else if(t===U){var a=this.currentScope();a.lexical.push(e)}else if(t===B){var o=this.currentScope();if(this.treatFunctionsAsVar){i=o.lexical.indexOf(e)>-1}else{i=o.lexical.indexOf(e)>-1||o.var.indexOf(e)>-1}o.functions.push(e)}else{for(var s=this.scopeStack.length-1;s>=0;--s){var u=this.scopeStack[s];if(u.lexical.indexOf(e)>-1&&!(u.flags&M&&u.lexical[0]===e)||!this.treatFunctionsAsVarInScope(u)&&u.functions.indexOf(e)>-1){i=true;break}u.var.push(e);if(this.inModule&&u.flags&C){delete this.undefinedExports[e]}if(u.flags&O){break}}}if(i){this.raiseRecoverable(n,"Identifier '"+e+"' has already been declared")}};ie.checkLocalExport=function(e){if(this.scopeStack[0].lexical.indexOf(e.name)===-1&&this.scopeStack[0].var.indexOf(e.name)===-1){this.undefinedExports[e.name]=e}};ie.currentScope=function(){return this.scopeStack[this.scopeStack.length-1]};ie.currentVarScope=function(){for(var e=this.scopeStack.length-1;;e--){var t=this.scopeStack[e];if(t.flags&O){return t}}};ie.currentThisScope=function(){for(var e=this.scopeStack.length-1;;e--){var t=this.scopeStack[e];if(t.flags&O&&!(t.flags&R)){return t}}};var ae=function Node(e,t,n){this.type="";this.start=t;this.end=0;if(e.options.locations){this.loc=new A(e,n)}if(e.options.directSourceFile){this.sourceFile=e.options.directSourceFile}if(e.options.ranges){this.range=[t,0]}};var oe=z.prototype;oe.startNode=function(){return new ae(this,this.start,this.startLoc)};oe.startNodeAt=function(e,t){return new ae(this,e,t)};function finishNodeAt(e,t,n,i){e.type=t;e.end=n;if(this.options.locations){e.loc.end=i}if(this.options.ranges){e.range[1]=n}return e}oe.finishNode=function(e,t){return finishNodeAt.call(this,e,t,this.lastTokEnd,this.lastTokEndLoc)};oe.finishNodeAt=function(e,t,n,i){return finishNodeAt.call(this,e,t,n,i)};var se=function TokContext(e,t,n,i,r){this.token=e;this.isExpr=!!t;this.preserveSpace=!!n;this.override=i;this.generator=!!r};var ue={b_stat:new se("{",false),b_expr:new se("{",true),b_tmpl:new se("${",false),p_stat:new se("(",false),p_expr:new se("(",true),q_tmpl:new se("`",true,true,function(e){return e.tryReadTemplateToken()}),f_stat:new se("function",false),f_expr:new se("function",true),f_expr_gen:new se("function",true,false,null,true),f_gen:new se("function",false,false,null,true)};var ce=z.prototype;ce.initialContext=function(){return[ue.b_stat]};ce.braceIsBlock=function(e){var t=this.curContext();if(t===ue.f_expr||t===ue.f_stat){return true}if(e===d.colon&&(t===ue.b_stat||t===ue.b_expr)){return!t.isExpr}if(e===d._return||e===d.name&&this.exprAllowed){return m.test(this.input.slice(this.lastTokEnd,this.start))}if(e===d._else||e===d.semi||e===d.eof||e===d.parenR||e===d.arrow){return true}if(e===d.braceL){return t===ue.b_stat}if(e===d._var||e===d._const||e===d.name){return false}return!this.exprAllowed};ce.inGeneratorContext=function(){for(var e=this.context.length-1;e>=1;e--){var t=this.context[e];if(t.token==="function"){return t.generator}}return false};ce.updateContext=function(e){var t,n=this.type;if(n.keyword&&e===d.dot){this.exprAllowed=false}else if(t=n.updateContext){t.call(this,e)}else{this.exprAllowed=n.beforeExpr}};d.parenR.updateContext=d.braceR.updateContext=function(){if(this.context.length===1){this.exprAllowed=true;return}var e=this.context.pop();if(e===ue.b_stat&&this.curContext().token==="function"){e=this.context.pop()}this.exprAllowed=!e.isExpr};d.braceL.updateContext=function(e){this.context.push(this.braceIsBlock(e)?ue.b_stat:ue.b_expr);this.exprAllowed=true};d.dollarBraceL.updateContext=function(){this.context.push(ue.b_tmpl);this.exprAllowed=true};d.parenL.updateContext=function(e){var t=e===d._if||e===d._for||e===d._with||e===d._while;this.context.push(t?ue.p_stat:ue.p_expr);this.exprAllowed=true};d.incDec.updateContext=function(){};d._function.updateContext=d._class.updateContext=function(e){if(e.beforeExpr&&e!==d.semi&&e!==d._else&&!(e===d._return&&m.test(this.input.slice(this.lastTokEnd,this.start)))&&!((e===d.colon||e===d.braceL)&&this.curContext()===ue.b_stat)){this.context.push(ue.f_expr)}else{this.context.push(ue.f_stat)}this.exprAllowed=false};d.backQuote.updateContext=function(){if(this.curContext()===ue.q_tmpl){this.context.pop()}else{this.context.push(ue.q_tmpl)}this.exprAllowed=false};d.star.updateContext=function(e){if(e===d._function){var t=this.context.length-1;if(this.context[t]===ue.f_expr){this.context[t]=ue.f_expr_gen}else{this.context[t]=ue.f_gen}}this.exprAllowed=true};d.name.updateContext=function(e){var t=false;if(this.options.ecmaVersion>=6&&e!==d.dot){if(this.value==="of"&&!this.exprAllowed||this.value==="yield"&&this.inGeneratorContext()){t=true}}this.exprAllowed=t};var le="ASCII ASCII_Hex_Digit AHex Alphabetic Alpha Any Assigned Bidi_Control Bidi_C Bidi_Mirrored Bidi_M Case_Ignorable CI Cased Changes_When_Casefolded CWCF Changes_When_Casemapped CWCM Changes_When_Lowercased CWL Changes_When_NFKC_Casefolded CWKCF Changes_When_Titlecased CWT Changes_When_Uppercased CWU Dash Default_Ignorable_Code_Point DI Deprecated Dep Diacritic Dia Emoji Emoji_Component Emoji_Modifier Emoji_Modifier_Base Emoji_Presentation Extender Ext Grapheme_Base Gr_Base Grapheme_Extend Gr_Ext Hex_Digit Hex IDS_Binary_Operator IDSB IDS_Trinary_Operator IDST ID_Continue IDC ID_Start IDS Ideographic Ideo Join_Control Join_C Logical_Order_Exception LOE Lowercase Lower Math Noncharacter_Code_Point NChar Pattern_Syntax Pat_Syn Pattern_White_Space Pat_WS Quotation_Mark QMark Radical Regional_Indicator RI 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Hanifi_Rohingya Rohg Makasar Maka Medefaidrin Medf Old_Sogdian Sogo Sogdian Sogd";var Ee=me+" Elymaic Elym Nandinagari Nand Nyiakeng_Puachue_Hmong Hmnp Wancho Wcho";var ge={9:de,10:me,11:Ee};var ve={};function buildUnicodeData(e){var t=ve[e]={binary:wordsRegexp(_e[e]+" "+he),nonBinary:{General_Category:wordsRegexp(he),Script:wordsRegexp(ge[e])}};t.nonBinary.Script_Extensions=t.nonBinary.Script;t.nonBinary.gc=t.nonBinary.General_Category;t.nonBinary.sc=t.nonBinary.Script;t.nonBinary.scx=t.nonBinary.Script_Extensions}buildUnicodeData(9);buildUnicodeData(10);buildUnicodeData(11);var De=z.prototype;var be=function RegExpValidationState(e){this.parser=e;this.validFlags="gim"+(e.options.ecmaVersion>=6?"uy":"")+(e.options.ecmaVersion>=9?"s":"");this.unicodeProperties=ve[e.options.ecmaVersion>=11?11:e.options.ecmaVersion];this.source="";this.flags="";this.start=0;this.switchU=false;this.switchN=false;this.pos=0;this.lastIntValue=0;this.lastStringValue="";this.lastAssertionIsQuantifiable=false;this.numCapturingParens=0;this.maxBackReference=0;this.groupNames=[];this.backReferenceNames=[]};be.prototype.reset=function reset(e,t,n){var i=n.indexOf("u")!==-1;this.start=e|0;this.source=t+"";this.flags=n;this.switchU=i&&this.parser.options.ecmaVersion>=6;this.switchN=i&&this.parser.options.ecmaVersion>=9};be.prototype.raise=function raise(e){this.parser.raiseRecoverable(this.start,"Invalid regular expression: /"+this.source+"/: "+e)};be.prototype.at=function at(e){var t=this.source;var n=t.length;if(e>=n){return-1}var i=t.charCodeAt(e);if(!this.switchU||i<=55295||i>=57344||e+1>=n){return i}var r=t.charCodeAt(e+1);return r>=56320&&r<=57343?(i<<10)+r-56613888:i};be.prototype.nextIndex=function nextIndex(e){var t=this.source;var n=t.length;if(e>=n){return n}var i=t.charCodeAt(e),r;if(!this.switchU||i<=55295||i>=57344||e+1>=n||(r=t.charCodeAt(e+1))<56320||r>57343){return e+1}return e+2};be.prototype.current=function current(){return this.at(this.pos)};be.prototype.lookahead=function lookahead(){return this.at(this.nextIndex(this.pos))};be.prototype.advance=function advance(){this.pos=this.nextIndex(this.pos)};be.prototype.eat=function eat(e){if(this.current()===e){this.advance();return true}return false};function codePointToString(e){if(e<=65535){return String.fromCharCode(e)}e-=65536;return String.fromCharCode((e>>10)+55296,(e&1023)+56320)}De.validateRegExpFlags=function(e){var t=e.validFlags;var n=e.flags;for(var i=0;i<n.length;i++){var r=n.charAt(i);if(t.indexOf(r)===-1){this.raise(e.start,"Invalid regular expression flag")}if(n.indexOf(r,i+1)>-1){this.raise(e.start,"Duplicate regular expression flag")}}};De.validateRegExpPattern=function(e){this.regexp_pattern(e);if(!e.switchN&&this.options.ecmaVersion>=9&&e.groupNames.length>0){e.switchN=true;this.regexp_pattern(e)}};De.regexp_pattern=function(e){e.pos=0;e.lastIntValue=0;e.lastStringValue="";e.lastAssertionIsQuantifiable=false;e.numCapturingParens=0;e.maxBackReference=0;e.groupNames.length=0;e.backReferenceNames.length=0;this.regexp_disjunction(e);if(e.pos!==e.source.length){if(e.eat(41)){e.raise("Unmatched ')'")}if(e.eat(93)||e.eat(125)){e.raise("Lone quantifier brackets")}}if(e.maxBackReference>e.numCapturingParens){e.raise("Invalid escape")}for(var t=0,n=e.backReferenceNames;t<n.length;t+=1){var i=n[t];if(e.groupNames.indexOf(i)===-1){e.raise("Invalid named capture referenced")}}};De.regexp_disjunction=function(e){this.regexp_alternative(e);while(e.eat(124)){this.regexp_alternative(e)}if(this.regexp_eatQuantifier(e,true)){e.raise("Nothing to repeat")}if(e.eat(123)){e.raise("Lone quantifier brackets")}};De.regexp_alternative=function(e){while(e.pos<e.source.length&&this.regexp_eatTerm(e)){}};De.regexp_eatTerm=function(e){if(this.regexp_eatAssertion(e)){if(e.lastAssertionIsQuantifiable&&this.regexp_eatQuantifier(e)){if(e.switchU){e.raise("Invalid quantifier")}}return true}if(e.switchU?this.regexp_eatAtom(e):this.regexp_eatExtendedAtom(e)){this.regexp_eatQuantifier(e);return true}return false};De.regexp_eatAssertion=function(e){var t=e.pos;e.lastAssertionIsQuantifiable=false;if(e.eat(94)||e.eat(36)){return true}if(e.eat(92)){if(e.eat(66)||e.eat(98)){return true}e.pos=t}if(e.eat(40)&&e.eat(63)){var n=false;if(this.options.ecmaVersion>=9){n=e.eat(60)}if(e.eat(61)||e.eat(33)){this.regexp_disjunction(e);if(!e.eat(41)){e.raise("Unterminated group")}e.lastAssertionIsQuantifiable=!n;return true}}e.pos=t;return false};De.regexp_eatQuantifier=function(e,t){if(t===void 0)t=false;if(this.regexp_eatQuantifierPrefix(e,t)){e.eat(63);return true}return false};De.regexp_eatQuantifierPrefix=function(e,t){return e.eat(42)||e.eat(43)||e.eat(63)||this.regexp_eatBracedQuantifier(e,t)};De.regexp_eatBracedQuantifier=function(e,t){var n=e.pos;if(e.eat(123)){var i=0,r=-1;if(this.regexp_eatDecimalDigits(e)){i=e.lastIntValue;if(e.eat(44)&&this.regexp_eatDecimalDigits(e)){r=e.lastIntValue}if(e.eat(125)){if(r!==-1&&r<i&&!t){e.raise("numbers out of order in {} quantifier")}return true}}if(e.switchU&&!t){e.raise("Incomplete quantifier")}e.pos=n}return false};De.regexp_eatAtom=function(e){return this.regexp_eatPatternCharacters(e)||e.eat(46)||this.regexp_eatReverseSolidusAtomEscape(e)||this.regexp_eatCharacterClass(e)||this.regexp_eatUncapturingGroup(e)||this.regexp_eatCapturingGroup(e)};De.regexp_eatReverseSolidusAtomEscape=function(e){var t=e.pos;if(e.eat(92)){if(this.regexp_eatAtomEscape(e)){return true}e.pos=t}return false};De.regexp_eatUncapturingGroup=function(e){var t=e.pos;if(e.eat(40)){if(e.eat(63)&&e.eat(58)){this.regexp_disjunction(e);if(e.eat(41)){return true}e.raise("Unterminated group")}e.pos=t}return false};De.regexp_eatCapturingGroup=function(e){if(e.eat(40)){if(this.options.ecmaVersion>=9){this.regexp_groupSpecifier(e)}else if(e.current()===63){e.raise("Invalid group")}this.regexp_disjunction(e);if(e.eat(41)){e.numCapturingParens+=1;return true}e.raise("Unterminated group")}return false};De.regexp_eatExtendedAtom=function(e){return e.eat(46)||this.regexp_eatReverseSolidusAtomEscape(e)||this.regexp_eatCharacterClass(e)||this.regexp_eatUncapturingGroup(e)||this.regexp_eatCapturingGroup(e)||this.regexp_eatInvalidBracedQuantifier(e)||this.regexp_eatExtendedPatternCharacter(e)};De.regexp_eatInvalidBracedQuantifier=function(e){if(this.regexp_eatBracedQuantifier(e,true)){e.raise("Nothing to repeat")}return false};De.regexp_eatSyntaxCharacter=function(e){var t=e.current();if(isSyntaxCharacter(t)){e.lastIntValue=t;e.advance();return true}return false};function isSyntaxCharacter(e){return e===36||e>=40&&e<=43||e===46||e===63||e>=91&&e<=94||e>=123&&e<=125}De.regexp_eatPatternCharacters=function(e){var t=e.pos;var n=0;while((n=e.current())!==-1&&!isSyntaxCharacter(n)){e.advance()}return e.pos!==t};De.regexp_eatExtendedPatternCharacter=function(e){var t=e.current();if(t!==-1&&t!==36&&!(t>=40&&t<=43)&&t!==46&&t!==63&&t!==91&&t!==94&&t!==124){e.advance();return true}return false};De.regexp_groupSpecifier=function(e){if(e.eat(63)){if(this.regexp_eatGroupName(e)){if(e.groupNames.indexOf(e.lastStringValue)!==-1){e.raise("Duplicate capture group name")}e.groupNames.push(e.lastStringValue);return}e.raise("Invalid group")}};De.regexp_eatGroupName=function(e){e.lastStringValue="";if(e.eat(60)){if(this.regexp_eatRegExpIdentifierName(e)&&e.eat(62)){return true}e.raise("Invalid capture group name")}return false};De.regexp_eatRegExpIdentifierName=function(e){e.lastStringValue="";if(this.regexp_eatRegExpIdentifierStart(e)){e.lastStringValue+=codePointToString(e.lastIntValue);while(this.regexp_eatRegExpIdentifierPart(e)){e.lastStringValue+=codePointToString(e.lastIntValue)}return true}return false};De.regexp_eatRegExpIdentifierStart=function(e){var t=e.pos;var n=e.current();e.advance();if(n===92&&this.regexp_eatRegExpUnicodeEscapeSequence(e)){n=e.lastIntValue}if(isRegExpIdentifierStart(n)){e.lastIntValue=n;return true}e.pos=t;return false};function isRegExpIdentifierStart(e){return isIdentifierStart(e,true)||e===36||e===95}De.regexp_eatRegExpIdentifierPart=function(e){var t=e.pos;var n=e.current();e.advance();if(n===92&&this.regexp_eatRegExpUnicodeEscapeSequence(e)){n=e.lastIntValue}if(isRegExpIdentifierPart(n)){e.lastIntValue=n;return true}e.pos=t;return false};function isRegExpIdentifierPart(e){return isIdentifierChar(e,true)||e===36||e===95||e===8204||e===8205}De.regexp_eatAtomEscape=function(e){if(this.regexp_eatBackReference(e)||this.regexp_eatCharacterClassEscape(e)||this.regexp_eatCharacterEscape(e)||e.switchN&&this.regexp_eatKGroupName(e)){return true}if(e.switchU){if(e.current()===99){e.raise("Invalid unicode escape")}e.raise("Invalid escape")}return false};De.regexp_eatBackReference=function(e){var t=e.pos;if(this.regexp_eatDecimalEscape(e)){var n=e.lastIntValue;if(e.switchU){if(n>e.maxBackReference){e.maxBackReference=n}return true}if(n<=e.numCapturingParens){return true}e.pos=t}return false};De.regexp_eatKGroupName=function(e){if(e.eat(107)){if(this.regexp_eatGroupName(e)){e.backReferenceNames.push(e.lastStringValue);return true}e.raise("Invalid named reference")}return false};De.regexp_eatCharacterEscape=function(e){return this.regexp_eatControlEscape(e)||this.regexp_eatCControlLetter(e)||this.regexp_eatZero(e)||this.regexp_eatHexEscapeSequence(e)||this.regexp_eatRegExpUnicodeEscapeSequence(e)||!e.switchU&&this.regexp_eatLegacyOctalEscapeSequence(e)||this.regexp_eatIdentityEscape(e)};De.regexp_eatCControlLetter=function(e){var t=e.pos;if(e.eat(99)){if(this.regexp_eatControlLetter(e)){return true}e.pos=t}return false};De.regexp_eatZero=function(e){if(e.current()===48&&!isDecimalDigit(e.lookahead())){e.lastIntValue=0;e.advance();return true}return false};De.regexp_eatControlEscape=function(e){var t=e.current();if(t===116){e.lastIntValue=9;e.advance();return true}if(t===110){e.lastIntValue=10;e.advance();return true}if(t===118){e.lastIntValue=11;e.advance();return true}if(t===102){e.lastIntValue=12;e.advance();return true}if(t===114){e.lastIntValue=13;e.advance();return true}return false};De.regexp_eatControlLetter=function(e){var t=e.current();if(isControlLetter(t)){e.lastIntValue=t%32;e.advance();return true}return false};function isControlLetter(e){return e>=65&&e<=90||e>=97&&e<=122}De.regexp_eatRegExpUnicodeEscapeSequence=function(e){var t=e.pos;if(e.eat(117)){if(this.regexp_eatFixedHexDigits(e,4)){var n=e.lastIntValue;if(e.switchU&&n>=55296&&n<=56319){var i=e.pos;if(e.eat(92)&&e.eat(117)&&this.regexp_eatFixedHexDigits(e,4)){var r=e.lastIntValue;if(r>=56320&&r<=57343){e.lastIntValue=(n-55296)*1024+(r-56320)+65536;return true}}e.pos=i;e.lastIntValue=n}return true}if(e.switchU&&e.eat(123)&&this.regexp_eatHexDigits(e)&&e.eat(125)&&isValidUnicode(e.lastIntValue)){return true}if(e.switchU){e.raise("Invalid unicode escape")}e.pos=t}return false};function isValidUnicode(e){return e>=0&&e<=1114111}De.regexp_eatIdentityEscape=function(e){if(e.switchU){if(this.regexp_eatSyntaxCharacter(e)){return true}if(e.eat(47)){e.lastIntValue=47;return true}return false}var t=e.current();if(t!==99&&(!e.switchN||t!==107)){e.lastIntValue=t;e.advance();return true}return false};De.regexp_eatDecimalEscape=function(e){e.lastIntValue=0;var t=e.current();if(t>=49&&t<=57){do{e.lastIntValue=10*e.lastIntValue+(t-48);e.advance()}while((t=e.current())>=48&&t<=57);return true}return false};De.regexp_eatCharacterClassEscape=function(e){var t=e.current();if(isCharacterClassEscape(t)){e.lastIntValue=-1;e.advance();return true}if(e.switchU&&this.options.ecmaVersion>=9&&(t===80||t===112)){e.lastIntValue=-1;e.advance();if(e.eat(123)&&this.regexp_eatUnicodePropertyValueExpression(e)&&e.eat(125)){return true}e.raise("Invalid property name")}return false};function isCharacterClassEscape(e){return e===100||e===68||e===115||e===83||e===119||e===87}De.regexp_eatUnicodePropertyValueExpression=function(e){var t=e.pos;if(this.regexp_eatUnicodePropertyName(e)&&e.eat(61)){var n=e.lastStringValue;if(this.regexp_eatUnicodePropertyValue(e)){var i=e.lastStringValue;this.regexp_validateUnicodePropertyNameAndValue(e,n,i);return true}}e.pos=t;if(this.regexp_eatLoneUnicodePropertyNameOrValue(e)){var r=e.lastStringValue;this.regexp_validateUnicodePropertyNameOrValue(e,r);return true}return false};De.regexp_validateUnicodePropertyNameAndValue=function(e,t,n){if(!has(e.unicodeProperties.nonBinary,t)){e.raise("Invalid property name")}if(!e.unicodeProperties.nonBinary[t].test(n)){e.raise("Invalid property value")}};De.regexp_validateUnicodePropertyNameOrValue=function(e,t){if(!e.unicodeProperties.binary.test(t)){e.raise("Invalid property name")}};De.regexp_eatUnicodePropertyName=function(e){var t=0;e.lastStringValue="";while(isUnicodePropertyNameCharacter(t=e.current())){e.lastStringValue+=codePointToString(t);e.advance()}return e.lastStringValue!==""};function isUnicodePropertyNameCharacter(e){return isControlLetter(e)||e===95}De.regexp_eatUnicodePropertyValue=function(e){var t=0;e.lastStringValue="";while(isUnicodePropertyValueCharacter(t=e.current())){e.lastStringValue+=codePointToString(t);e.advance()}return e.lastStringValue!==""};function isUnicodePropertyValueCharacter(e){return isUnicodePropertyNameCharacter(e)||isDecimalDigit(e)}De.regexp_eatLoneUnicodePropertyNameOrValue=function(e){return this.regexp_eatUnicodePropertyValue(e)};De.regexp_eatCharacterClass=function(e){if(e.eat(91)){e.eat(94);this.regexp_classRanges(e);if(e.eat(93)){return true}e.raise("Unterminated character class")}return false};De.regexp_classRanges=function(e){while(this.regexp_eatClassAtom(e)){var t=e.lastIntValue;if(e.eat(45)&&this.regexp_eatClassAtom(e)){var n=e.lastIntValue;if(e.switchU&&(t===-1||n===-1)){e.raise("Invalid character class")}if(t!==-1&&n!==-1&&t>n){e.raise("Range out of order in character class")}}}};De.regexp_eatClassAtom=function(e){var t=e.pos;if(e.eat(92)){if(this.regexp_eatClassEscape(e)){return true}if(e.switchU){var n=e.current();if(n===99||isOctalDigit(n)){e.raise("Invalid class escape")}e.raise("Invalid escape")}e.pos=t}var i=e.current();if(i!==93){e.lastIntValue=i;e.advance();return true}return false};De.regexp_eatClassEscape=function(e){var t=e.pos;if(e.eat(98)){e.lastIntValue=8;return true}if(e.switchU&&e.eat(45)){e.lastIntValue=45;return true}if(!e.switchU&&e.eat(99)){if(this.regexp_eatClassControlLetter(e)){return true}e.pos=t}return this.regexp_eatCharacterClassEscape(e)||this.regexp_eatCharacterEscape(e)};De.regexp_eatClassControlLetter=function(e){var t=e.current();if(isDecimalDigit(t)||t===95){e.lastIntValue=t%32;e.advance();return true}return false};De.regexp_eatHexEscapeSequence=function(e){var t=e.pos;if(e.eat(120)){if(this.regexp_eatFixedHexDigits(e,2)){return true}if(e.switchU){e.raise("Invalid escape")}e.pos=t}return false};De.regexp_eatDecimalDigits=function(e){var t=e.pos;var n=0;e.lastIntValue=0;while(isDecimalDigit(n=e.current())){e.lastIntValue=10*e.lastIntValue+(n-48);e.advance()}return e.pos!==t};function isDecimalDigit(e){return e>=48&&e<=57}De.regexp_eatHexDigits=function(e){var t=e.pos;var n=0;e.lastIntValue=0;while(isHexDigit(n=e.current())){e.lastIntValue=16*e.lastIntValue+hexToInt(n);e.advance()}return e.pos!==t};function isHexDigit(e){return e>=48&&e<=57||e>=65&&e<=70||e>=97&&e<=102}function hexToInt(e){if(e>=65&&e<=70){return 10+(e-65)}if(e>=97&&e<=102){return 10+(e-97)}return e-48}De.regexp_eatLegacyOctalEscapeSequence=function(e){if(this.regexp_eatOctalDigit(e)){var t=e.lastIntValue;if(this.regexp_eatOctalDigit(e)){var n=e.lastIntValue;if(t<=3&&this.regexp_eatOctalDigit(e)){e.lastIntValue=t*64+n*8+e.lastIntValue}else{e.lastIntValue=t*8+n}}else{e.lastIntValue=t}return true}return false};De.regexp_eatOctalDigit=function(e){var t=e.current();if(isOctalDigit(t)){e.lastIntValue=t-48;e.advance();return true}e.lastIntValue=0;return false};function isOctalDigit(e){return e>=48&&e<=55}De.regexp_eatFixedHexDigits=function(e,t){var n=e.pos;e.lastIntValue=0;for(var i=0;i<t;++i){var r=e.current();if(!isHexDigit(r)){e.pos=n;return false}e.lastIntValue=16*e.lastIntValue+hexToInt(r);e.advance()}return true};var ye=function Token(e){this.type=e.type;this.value=e.value;this.start=e.start;this.end=e.end;if(e.options.locations){this.loc=new A(e,e.startLoc,e.endLoc)}if(e.options.ranges){this.range=[e.start,e.end]}};var ke=z.prototype;ke.next=function(e){if(!e&&this.type.keyword&&this.containsEsc){this.raiseRecoverable(this.start,"Escape sequence in keyword "+this.type.keyword)}if(this.options.onToken){this.options.onToken(new ye(this))}this.lastTokEnd=this.end;this.lastTokStart=this.start;this.lastTokEndLoc=this.endLoc;this.lastTokStartLoc=this.startLoc;this.nextToken()};ke.getToken=function(){this.next();return new ye(this)};if(typeof Symbol!=="undefined"){ke[Symbol.iterator]=function(){var e=this;return{next:function(){var t=e.getToken();return{done:t.type===d.eof,value:t}}}}}ke.curContext=function(){return this.context[this.context.length-1]};ke.nextToken=function(){var e=this.curContext();if(!e||!e.preserveSpace){this.skipSpace()}this.start=this.pos;if(this.options.locations){this.startLoc=this.curPosition()}if(this.pos>=this.input.length){return this.finishToken(d.eof)}if(e.override){return e.override(this)}else{this.readToken(this.fullCharCodeAtPos())}};ke.readToken=function(e){if(isIdentifierStart(e,this.options.ecmaVersion>=6)||e===92){return this.readWord()}return this.getTokenFromCode(e)};ke.fullCharCodeAtPos=function(){var e=this.input.charCodeAt(this.pos);if(e<=55295||e>=57344){return e}var t=this.input.charCodeAt(this.pos+1);return(e<<10)+t-56613888};ke.skipBlockComment=function(){var e=this.options.onComment&&this.curPosition();var t=this.pos,n=this.input.indexOf("*/",this.pos+=2);if(n===-1){this.raise(this.pos-2,"Unterminated comment")}this.pos=n+2;if(this.options.locations){E.lastIndex=t;var i;while((i=E.exec(this.input))&&i.index<this.pos){++this.curLine;this.lineStart=i.index+i[0].length}}if(this.options.onComment){this.options.onComment(true,this.input.slice(t+2,n),t,this.pos,e,this.curPosition())}};ke.skipLineComment=function(e){var t=this.pos;var n=this.options.onComment&&this.curPosition();var i=this.input.charCodeAt(this.pos+=e);while(this.pos<this.input.length&&!isNewLine(i)){i=this.input.charCodeAt(++this.pos)}if(this.options.onComment){this.options.onComment(false,this.input.slice(t+e,this.pos),t,this.pos,n,this.curPosition())}};ke.skipSpace=function(){e:while(this.pos<this.input.length){var e=this.input.charCodeAt(this.pos);switch(e){case 32:case 160:++this.pos;break;case 13:if(this.input.charCodeAt(this.pos+1)===10){++this.pos}case 10:case 8232:case 8233:++this.pos;if(this.options.locations){++this.curLine;this.lineStart=this.pos}break;case 47:switch(this.input.charCodeAt(this.pos+1)){case 42:this.skipBlockComment();break;case 47:this.skipLineComment(2);break;default:break e}break;default:if(e>8&&e<14||e>=5760&&g.test(String.fromCharCode(e))){++this.pos}else{break e}}}};ke.finishToken=function(e,t){this.end=this.pos;if(this.options.locations){this.endLoc=this.curPosition()}var n=this.type;this.type=e;this.value=t;this.updateContext(n)};ke.readToken_dot=function(){var e=this.input.charCodeAt(this.pos+1);if(e>=48&&e<=57){return this.readNumber(true)}var t=this.input.charCodeAt(this.pos+2);if(this.options.ecmaVersion>=6&&e===46&&t===46){this.pos+=3;return this.finishToken(d.ellipsis)}else{++this.pos;return this.finishToken(d.dot)}};ke.readToken_slash=function(){var e=this.input.charCodeAt(this.pos+1);if(this.exprAllowed){++this.pos;return this.readRegexp()}if(e===61){return this.finishOp(d.assign,2)}return this.finishOp(d.slash,1)};ke.readToken_mult_modulo_exp=function(e){var t=this.input.charCodeAt(this.pos+1);var n=1;var i=e===42?d.star:d.modulo;if(this.options.ecmaVersion>=7&&e===42&&t===42){++n;i=d.starstar;t=this.input.charCodeAt(this.pos+2)}if(t===61){return this.finishOp(d.assign,n+1)}return this.finishOp(i,n)};ke.readToken_pipe_amp=function(e){var t=this.input.charCodeAt(this.pos+1);if(t===e){return this.finishOp(e===124?d.logicalOR:d.logicalAND,2)}if(t===61){return this.finishOp(d.assign,2)}return this.finishOp(e===124?d.bitwiseOR:d.bitwiseAND,1)};ke.readToken_caret=function(){var e=this.input.charCodeAt(this.pos+1);if(e===61){return this.finishOp(d.assign,2)}return this.finishOp(d.bitwiseXOR,1)};ke.readToken_plus_min=function(e){var t=this.input.charCodeAt(this.pos+1);if(t===e){if(t===45&&!this.inModule&&this.input.charCodeAt(this.pos+2)===62&&(this.lastTokEnd===0||m.test(this.input.slice(this.lastTokEnd,this.pos)))){this.skipLineComment(3);this.skipSpace();return this.nextToken()}return this.finishOp(d.incDec,2)}if(t===61){return this.finishOp(d.assign,2)}return this.finishOp(d.plusMin,1)};ke.readToken_lt_gt=function(e){var t=this.input.charCodeAt(this.pos+1);var n=1;if(t===e){n=e===62&&this.input.charCodeAt(this.pos+2)===62?3:2;if(this.input.charCodeAt(this.pos+n)===61){return this.finishOp(d.assign,n+1)}return this.finishOp(d.bitShift,n)}if(t===33&&e===60&&!this.inModule&&this.input.charCodeAt(this.pos+2)===45&&this.input.charCodeAt(this.pos+3)===45){this.skipLineComment(4);this.skipSpace();return this.nextToken()}if(t===61){n=2}return this.finishOp(d.relational,n)};ke.readToken_eq_excl=function(e){var t=this.input.charCodeAt(this.pos+1);if(t===61){return this.finishOp(d.equality,this.input.charCodeAt(this.pos+2)===61?3:2)}if(e===61&&t===62&&this.options.ecmaVersion>=6){this.pos+=2;return this.finishToken(d.arrow)}return this.finishOp(e===61?d.eq:d.prefix,1)};ke.getTokenFromCode=function(e){switch(e){case 46:return this.readToken_dot();case 40:++this.pos;return this.finishToken(d.parenL);case 41:++this.pos;return this.finishToken(d.parenR);case 59:++this.pos;return this.finishToken(d.semi);case 44:++this.pos;return this.finishToken(d.comma);case 91:++this.pos;return this.finishToken(d.bracketL);case 93:++this.pos;return this.finishToken(d.bracketR);case 123:++this.pos;return this.finishToken(d.braceL);case 125:++this.pos;return this.finishToken(d.braceR);case 58:++this.pos;return this.finishToken(d.colon);case 63:++this.pos;return this.finishToken(d.question);case 96:if(this.options.ecmaVersion<6){break}++this.pos;return this.finishToken(d.backQuote);case 48:var t=this.input.charCodeAt(this.pos+1);if(t===120||t===88){return this.readRadixNumber(16)}if(this.options.ecmaVersion>=6){if(t===111||t===79){return this.readRadixNumber(8)}if(t===98||t===66){return this.readRadixNumber(2)}}case 49:case 50:case 51:case 52:case 53:case 54:case 55:case 56:case 57:return this.readNumber(false);case 34:case 39:return this.readString(e);case 47:return this.readToken_slash();case 37:case 42:return this.readToken_mult_modulo_exp(e);case 124:case 38:return this.readToken_pipe_amp(e);case 94:return this.readToken_caret();case 43:case 45:return this.readToken_plus_min(e);case 60:case 62:return this.readToken_lt_gt(e);case 61:case 33:return this.readToken_eq_excl(e);case 126:return this.finishOp(d.prefix,1)}this.raise(this.pos,"Unexpected character '"+codePointToString$1(e)+"'")};ke.finishOp=function(e,t){var n=this.input.slice(this.pos,this.pos+t);this.pos+=t;return this.finishToken(e,n)};ke.readRegexp=function(){var e,t,n=this.pos;for(;;){if(this.pos>=this.input.length){this.raise(n,"Unterminated regular expression")}var i=this.input.charAt(this.pos);if(m.test(i)){this.raise(n,"Unterminated regular expression")}if(!e){if(i==="["){t=true}else if(i==="]"&&t){t=false}else if(i==="/"&&!t){break}e=i==="\\"}else{e=false}++this.pos}var r=this.input.slice(n,this.pos);++this.pos;var a=this.pos;var o=this.readWord1();if(this.containsEsc){this.unexpected(a)}var s=this.regexpState||(this.regexpState=new be(this));s.reset(n,r,o);this.validateRegExpFlags(s);this.validateRegExpPattern(s);var u=null;try{u=new RegExp(r,o)}catch(e){}return this.finishToken(d.regexp,{pattern:r,flags:o,value:u})};ke.readInt=function(e,t){var n=this.pos,i=0;for(var r=0,a=t==null?Infinity:t;r<a;++r){var o=this.input.charCodeAt(this.pos),s=void 0;if(o>=97){s=o-97+10}else if(o>=65){s=o-65+10}else if(o>=48&&o<=57){s=o-48}else{s=Infinity}if(s>=e){break}++this.pos;i=i*e+s}if(this.pos===n||t!=null&&this.pos-n!==t){return null}return i};ke.readRadixNumber=function(e){var t=this.pos;this.pos+=2;var n=this.readInt(e);if(n==null){this.raise(this.start+2,"Expected number in radix "+e)}if(this.options.ecmaVersion>=11&&this.input.charCodeAt(this.pos)===110){n=typeof BigInt!=="undefined"?BigInt(this.input.slice(t,this.pos)):null;++this.pos}else if(isIdentifierStart(this.fullCharCodeAtPos())){this.raise(this.pos,"Identifier directly after number")}return this.finishToken(d.num,n)};ke.readNumber=function(e){var t=this.pos;if(!e&&this.readInt(10)===null){this.raise(t,"Invalid number")}var n=this.pos-t>=2&&this.input.charCodeAt(t)===48;if(n&&this.strict){this.raise(t,"Invalid number")}var i=this.input.charCodeAt(this.pos);if(!n&&!e&&this.options.ecmaVersion>=11&&i===110){var r=this.input.slice(t,this.pos);var a=typeof BigInt!=="undefined"?BigInt(r):null;++this.pos;if(isIdentifierStart(this.fullCharCodeAtPos())){this.raise(this.pos,"Identifier directly after number")}return this.finishToken(d.num,a)}if(n&&/[89]/.test(this.input.slice(t,this.pos))){n=false}if(i===46&&!n){++this.pos;this.readInt(10);i=this.input.charCodeAt(this.pos)}if((i===69||i===101)&&!n){i=this.input.charCodeAt(++this.pos);if(i===43||i===45){++this.pos}if(this.readInt(10)===null){this.raise(t,"Invalid number")}}if(isIdentifierStart(this.fullCharCodeAtPos())){this.raise(this.pos,"Identifier directly after number")}var o=this.input.slice(t,this.pos);var s=n?parseInt(o,8):parseFloat(o);return this.finishToken(d.num,s)};ke.readCodePoint=function(){var e=this.input.charCodeAt(this.pos),t;if(e===123){if(this.options.ecmaVersion<6){this.unexpected()}var n=++this.pos;t=this.readHexChar(this.input.indexOf("}",this.pos)-this.pos);++this.pos;if(t>1114111){this.invalidStringToken(n,"Code point out of bounds")}}else{t=this.readHexChar(4)}return t};function codePointToString$1(e){if(e<=65535){return String.fromCharCode(e)}e-=65536;return String.fromCharCode((e>>10)+55296,(e&1023)+56320)}ke.readString=function(e){var t="",n=++this.pos;for(;;){if(this.pos>=this.input.length){this.raise(this.start,"Unterminated string constant")}var i=this.input.charCodeAt(this.pos);if(i===e){break}if(i===92){t+=this.input.slice(n,this.pos);t+=this.readEscapedChar(false);n=this.pos}else{if(isNewLine(i,this.options.ecmaVersion>=10)){this.raise(this.start,"Unterminated string constant")}++this.pos}}t+=this.input.slice(n,this.pos++);return this.finishToken(d.string,t)};var Se={};ke.tryReadTemplateToken=function(){this.inTemplateElement=true;try{this.readTmplToken()}catch(e){if(e===Se){this.readInvalidTemplateToken()}else{throw e}}this.inTemplateElement=false};ke.invalidStringToken=function(e,t){if(this.inTemplateElement&&this.options.ecmaVersion>=9){throw Se}else{this.raise(e,t)}};ke.readTmplToken=function(){var e="",t=this.pos;for(;;){if(this.pos>=this.input.length){this.raise(this.start,"Unterminated template")}var n=this.input.charCodeAt(this.pos);if(n===96||n===36&&this.input.charCodeAt(this.pos+1)===123){if(this.pos===this.start&&(this.type===d.template||this.type===d.invalidTemplate)){if(n===36){this.pos+=2;return this.finishToken(d.dollarBraceL)}else{++this.pos;return this.finishToken(d.backQuote)}}e+=this.input.slice(t,this.pos);return this.finishToken(d.template,e)}if(n===92){e+=this.input.slice(t,this.pos);e+=this.readEscapedChar(true);t=this.pos}else if(isNewLine(n)){e+=this.input.slice(t,this.pos);++this.pos;switch(n){case 13:if(this.input.charCodeAt(this.pos)===10){++this.pos}case 10:e+="\n";break;default:e+=String.fromCharCode(n);break}if(this.options.locations){++this.curLine;this.lineStart=this.pos}t=this.pos}else{++this.pos}}};ke.readInvalidTemplateToken=function(){for(;this.pos<this.input.length;this.pos++){switch(this.input[this.pos]){case"\\":++this.pos;break;case"$":if(this.input[this.pos+1]!=="{"){break}case"`":return this.finishToken(d.invalidTemplate,this.input.slice(this.start,this.pos))}}this.raise(this.start,"Unterminated template")};ke.readEscapedChar=function(e){var t=this.input.charCodeAt(++this.pos);++this.pos;switch(t){case 110:return"\n";case 114:return"\r";case 120:return String.fromCharCode(this.readHexChar(2));case 117:return codePointToString$1(this.readCodePoint());case 116:return"\t";case 98:return"\b";case 118:return"\v";case 102:return"\f";case 13:if(this.input.charCodeAt(this.pos)===10){++this.pos}case 10:if(this.options.locations){this.lineStart=this.pos;++this.curLine}return"";case 56:case 57:if(e){var n=this.pos-1;this.invalidStringToken(n,"Invalid escape sequence in template string");return null}default:if(t>=48&&t<=55){var i=this.input.substr(this.pos-1,3).match(/^[0-7]+/)[0];var r=parseInt(i,8);if(r>255){i=i.slice(0,-1);r=parseInt(i,8)}this.pos+=i.length-1;t=this.input.charCodeAt(this.pos);if((i!=="0"||t===56||t===57)&&(this.strict||e)){this.invalidStringToken(this.pos-1-i.length,e?"Octal literal in template string":"Octal literal in strict mode")}return String.fromCharCode(r)}if(isNewLine(t)){return""}return String.fromCharCode(t)}};ke.readHexChar=function(e){var t=this.pos;var n=this.readInt(16,e);if(n===null){this.invalidStringToken(t,"Bad character escape sequence")}return n};ke.readWord1=function(){this.containsEsc=false;var e="",t=true,n=this.pos;var i=this.options.ecmaVersion>=6;while(this.pos<this.input.length){var r=this.fullCharCodeAtPos();if(isIdentifierChar(r,i)){this.pos+=r<=65535?1:2}else if(r===92){this.containsEsc=true;e+=this.input.slice(n,this.pos);var a=this.pos;if(this.input.charCodeAt(++this.pos)!==117){this.invalidStringToken(this.pos,"Expecting Unicode escape sequence \\uXXXX")}++this.pos;var o=this.readCodePoint();if(!(t?isIdentifierStart:isIdentifierChar)(o,i)){this.invalidStringToken(a,"Invalid Unicode escape")}e+=codePointToString$1(o);n=this.pos}else{break}t=false}return e+this.input.slice(n,this.pos)};ke.readWord=function(){var e=this.readWord1();var t=d.name;if(this.keywords.test(e)){t=h[e]}return this.finishToken(t,e)};var Ae="7.1.0";z.acorn={Parser:z,version:Ae,defaultOptions:T,Position:S,SourceLocation:A,getLineInfo:getLineInfo,Node:ae,TokenType:f,tokTypes:d,keywordTypes:h,TokContext:se,tokContexts:ue,isIdentifierChar:isIdentifierChar,isIdentifierStart:isIdentifierStart,Token:ye,isNewLine:isNewLine,lineBreak:m,lineBreakG:E,nonASCIIwhitespace:g};function parse(e,t){return z.parse(e,t)}function parseExpressionAt(e,t,n){return z.parseExpressionAt(e,t,n)}function tokenizer(e,t){return z.tokenizer(e,t)}e.Node=ae;e.Parser=z;e.Position=S;e.SourceLocation=A;e.TokContext=se;e.Token=ye;e.TokenType=f;e.defaultOptions=T;e.getLineInfo=getLineInfo;e.isIdentifierChar=isIdentifierChar;e.isIdentifierStart=isIdentifierStart;e.isNewLine=isNewLine;e.keywordTypes=h;e.lineBreak=m;e.lineBreakG=E;e.nonASCIIwhitespace=g;e.parse=parse;e.parseExpressionAt=parseExpressionAt;e.tokContexts=ue;e.tokTypes=d;e.tokenizer=tokenizer;e.version=Ae;Object.defineProperty(e,"__esModule",{value:true})})}});
\ No newline at end of file
diff --git a/packages/next/lib/get-package-version.ts b/packages/next/lib/get-package-version.ts
index be63f2d4524d9..9e2fcbebf8969 100644
--- a/packages/next/lib/get-package-version.ts
+++ b/packages/next/lib/get-package-version.ts
@@ -1,28 +1,47 @@
-//  issuer.endsWith(path.posix.sep) || issuer.endsWith(path.win32.sep)
-import findUp from 'next/dist/compiled/find-up'
-import * as path from 'path'
 import { promises as fs } from 'fs'
+import findUp from 'next/dist/compiled/find-up'
 import JSON5 from 'next/dist/compiled/json5'
+import * as path from 'path'
 import { resolveRequest } from './resolve-request'
 
-export async function getPackageVersion({
+type PackageJsonDependencies = {
+  dependencies: Record<string, string>
+  devDependencies: Record<string, string>
+}
+
+let cachedDeps: PackageJsonDependencies
+
+async function getDependencies({
   cwd,
-  name,
 }: {
   cwd: string
-  name: string
-}): Promise<string | null> {
+}): Promise<PackageJsonDependencies> {
+  if (cachedDeps) {
+    return cachedDeps
+  }
+
   const configurationPath: string | undefined = await findUp('package.json', {
     cwd,
   })
   if (!configurationPath) {
-    return null
+    return (cachedDeps = { dependencies: {}, devDependencies: {} })
   }
 
   const content = await fs.readFile(configurationPath, 'utf-8')
   const packageJson: any = JSON5.parse(content)
 
   const { dependencies = {}, devDependencies = {} } = packageJson || {}
+  return (cachedDeps = { dependencies, devDependencies })
+}
+
+export async function getPackageVersion({
+  cwd,
+  name,
+}: {
+  cwd: string
+  name: string
+}): Promise<string | null> {
+  const { dependencies, devDependencies } = await getDependencies({ cwd })
   if (!(dependencies[name] || devDependencies[name])) {
     return null
   }
diff --git a/packages/next/next-server/lib/constants.ts b/packages/next/next-server/lib/constants.ts
index 665fc9b24f4ac..8257e98eac596 100644
--- a/packages/next/next-server/lib/constants.ts
+++ b/packages/next/next-server/lib/constants.ts
@@ -8,6 +8,7 @@ export const EXPORT_MARKER = 'export-marker.json'
 export const EXPORT_DETAIL = 'export-detail.json'
 export const PRERENDER_MANIFEST = 'prerender-manifest.json'
 export const ROUTES_MANIFEST = 'routes-manifest.json'
+export const DEV_CLIENT_PAGES_MANIFEST = '_devPagesManifest.json'
 export const REACT_LOADABLE_MANIFEST = 'react-loadable-manifest.json'
 export const FONT_MANIFEST = 'font-manifest.json'
 export const SERVER_DIRECTORY = 'server'
diff --git a/packages/next/next-server/lib/mitt.ts b/packages/next/next-server/lib/mitt.ts
index 6aa95277c1438..e7c57c33b6e6c 100644
--- a/packages/next/next-server/lib/mitt.ts
+++ b/packages/next/next-server/lib/mitt.ts
@@ -32,7 +32,6 @@ export default function mitt(): MittEmitter {
 
     off(type: string, handler: Handler) {
       if (all[type]) {
-        // tslint:disable-next-line:no-bitwise
         all[type].splice(all[type].indexOf(handler) >>> 0, 1)
       }
     },
diff --git a/packages/next/next-server/lib/post-process.ts b/packages/next/next-server/lib/post-process.ts
index a64778c4eacb8..d922a56bd174c 100644
--- a/packages/next/next-server/lib/post-process.ts
+++ b/packages/next/next-server/lib/post-process.ts
@@ -179,7 +179,8 @@ class ImageOptimizerMiddleware implements PostProcessMiddleware {
     let imagePreloadTags = _data.preloads.images
       .filter((imgHref) => !preloadTagAlreadyExists(markup, imgHref))
       .reduce(
-        (acc, imgHref) => acc + `<link rel="preload" href="${imgHref}"/>`,
+        (acc, imgHref) =>
+          acc + `<link rel="preload" href="${imgHref}" as="image"/>`,
         ''
       )
     return result.replace(
diff --git a/packages/next/next-server/lib/router/router.ts b/packages/next/next-server/lib/router/router.ts
index ae75e2ed9a0d2..ae859d4fe9bcd 100644
--- a/packages/next/next-server/lib/router/router.ts
+++ b/packages/next/next-server/lib/router/router.ts
@@ -3,25 +3,28 @@
 import { ParsedUrlQuery } from 'querystring'
 import { ComponentType } from 'react'
 import { UrlObject } from 'url'
+import {
+  normalizePathTrailingSlash,
+  removePathTrailingSlash,
+} from '../../../client/normalize-trailing-slash'
+import { GoodPageCache } from '../../../client/page-loader'
+import { denormalizePagePath } from '../../server/denormalize-page-path'
 import mitt, { MittEmitter } from '../mitt'
 import {
   AppContextType,
   formatWithValidation,
+  getLocationOrigin,
   getURL,
   loadGetInitialProps,
   NextPageContext,
   ST,
-  getLocationOrigin,
 } from '../utils'
 import { isDynamicRoute } from './utils/is-dynamic'
+import { parseRelativeUrl } from './utils/parse-relative-url'
+import { searchParamsToUrlQuery } from './utils/querystring'
+import resolveRewrites from './utils/resolve-rewrites'
 import { getRouteMatcher } from './utils/route-matcher'
 import { getRouteRegex } from './utils/route-regex'
-import { searchParamsToUrlQuery } from './utils/querystring'
-import { parseRelativeUrl } from './utils/parse-relative-url'
-import {
-  removePathTrailingSlash,
-  normalizePathTrailingSlash,
-} from '../../../client/normalize-trailing-slash'
 
 interface TransitionOptions {
   shallow?: boolean
@@ -129,8 +132,6 @@ function tryParseRelativeUrl(
   }
 }
 
-type ComponentRes = { page: ComponentType; mod: any }
-
 export type BaseRouter = {
   route: string
   pathname: string
@@ -156,16 +157,22 @@ export type PrefetchOptions = {
   priority?: boolean
 }
 
-type RouteInfo = {
+export type PrivateRouteInfo = {
   Component: ComponentType
+  styleSheets: string[]
   __N_SSG?: boolean
   __N_SSP?: boolean
-  props?: any
+  props?: Record<string, any>
   err?: Error
   error?: any
 }
 
-type Subscription = (data: RouteInfo, App?: ComponentType) => Promise<void>
+export type AppProps = Pick<PrivateRouteInfo, 'Component' | 'err'> & {
+  router: Router
+} & Record<string, any>
+export type AppComponent = ComponentType<AppProps>
+
+type Subscription = (data: PrivateRouteInfo, App: AppComponent) => Promise<void>
 
 type BeforePopStateCallback = (state: NextHistoryState) => boolean
 
@@ -226,7 +233,7 @@ export default class Router implements BaseRouter {
   /**
    * Map of all components loaded in `Router`
    */
-  components: { [pathname: string]: RouteInfo }
+  components: { [pathname: string]: PrivateRouteInfo }
   // Static Data Cache
   sdc: { [asPath: string]: object } = {}
   sub: Subscription
@@ -234,7 +241,7 @@ export default class Router implements BaseRouter {
   pageLoader: any
   _bps: BeforePopStateCallback | undefined
   events: MittEmitter
-  _wrapApp: (App: ComponentType) => any
+  _wrapApp: (App: AppComponent) => any
   isSsr: boolean
   isFallback: boolean
   _inFlightRoute?: string
@@ -251,6 +258,7 @@ export default class Router implements BaseRouter {
       App,
       wrapApp,
       Component,
+      initialStyleSheets,
       err,
       subscription,
       isFallback,
@@ -259,8 +267,9 @@ export default class Router implements BaseRouter {
       initialProps: any
       pageLoader: any
       Component: ComponentType
-      App: ComponentType
-      wrapApp: (App: ComponentType) => any
+      initialStyleSheets: string[]
+      App: AppComponent
+      wrapApp: (App: AppComponent) => any
       err?: Error
       isFallback: boolean
     }
@@ -276,6 +285,7 @@ export default class Router implements BaseRouter {
     if (pathname !== '/_error') {
       this.components[this.route] = {
         Component,
+        styleSheets: initialStyleSheets,
         props: initialProps,
         err,
         __N_SSG: initialProps && initialProps.__N_SSG,
@@ -283,7 +293,12 @@ export default class Router implements BaseRouter {
       }
     }
 
-    this.components['/_app'] = { Component: App }
+    this.components['/_app'] = {
+      Component: App as ComponentType,
+      styleSheets: [
+        /* /_app does not need its stylesheets managed */
+      ],
+    }
 
     // Backwards compat for Router.router.events
     // TODO: Should be remove the following major version as it was never documented
@@ -398,31 +413,6 @@ export default class Router implements BaseRouter {
     this.change('replaceState', url, as, options)
   }
 
-  update(route: string, mod: any) {
-    const Component: ComponentType = mod.default || mod
-    const data = this.components[route]
-    if (!data) {
-      throw new Error(`Cannot update unavailable route: ${route}`)
-    }
-
-    const newData = Object.assign({}, data, {
-      Component,
-      __N_SSG: mod.__N_SSG,
-      __N_SSP: mod.__N_SSP,
-    })
-    this.components[route] = newData
-
-    // pages/_app.js updated
-    if (route === '/_app') {
-      this.notify(this.components[this.route])
-      return
-    }
-
-    if (route === this.route) {
-      this.notify(newData)
-    }
-  }
-
   reload(): void {
     window.location.reload()
   }
@@ -491,6 +481,7 @@ export default class Router implements BaseRouter {
     if (!(options as any)._h && this.onlyAHashChange(cleanedAs)) {
       this.asPath = cleanedAs
       Router.events.emit('hashChangeStart', as)
+      // TODO: do we need the resolved href when only a hash change?
       this.changeState(method, url, as, options)
       this.scrollToHash(cleanedAs)
       this.notify(this.components[this.route])
@@ -498,11 +489,25 @@ export default class Router implements BaseRouter {
       return true
     }
 
-    const parsed = tryParseRelativeUrl(url)
+    // The build manifest needs to be loaded before auto-static dynamic pages
+    // get their query parameters to allow ensuring they can be parsed properly
+    // when rewritten to
+    const pages = await this.pageLoader.getPageList()
+    const { __rewrites: rewrites } = await this.pageLoader.promisedBuildManifest
+
+    let parsed = tryParseRelativeUrl(url)
 
     if (!parsed) return false
 
     let { pathname, searchParams } = parsed
+
+    parsed = this._resolveHref(parsed, pages) as typeof parsed
+
+    if (parsed.pathname !== pathname) {
+      pathname = parsed.pathname
+      url = formatWithValidation(parsed)
+    }
+
     const query = searchParamsToUrlQuery(searchParams)
 
     // url and as should always be prefixed with basePath by this
@@ -524,8 +529,17 @@ export default class Router implements BaseRouter {
     const route = removePathTrailingSlash(pathname)
     const { shallow = false } = options
 
+    // we need to resolve the as value using rewrites for dynamic SSG
+    // pages to allow building the data URL correctly
+    let resolvedAs = as
+
+    if (process.env.__NEXT_HAS_REWRITES) {
+      resolvedAs = resolveRewrites(as, pages, basePath, rewrites, query)
+    }
+    resolvedAs = delBasePath(resolvedAs)
+
     if (isDynamicRoute(route)) {
-      const { pathname: asPathname } = parseRelativeUrl(cleanedAs)
+      const { pathname: asPathname } = parseRelativeUrl(resolvedAs)
       const routeRegex = getRouteRegex(route)
       const routeMatch = getRouteMatcher(routeRegex)(asPathname)
       if (!routeMatch) {
@@ -640,7 +654,7 @@ export default class Router implements BaseRouter {
     query: ParsedUrlQuery,
     as: string,
     loadErrorFail?: boolean
-  ): Promise<RouteInfo> {
+  ): Promise<PrivateRouteInfo> {
     if (err.cancelled) {
       // bubble up cancellation errors
       throw err
@@ -663,8 +677,15 @@ export default class Router implements BaseRouter {
     }
 
     try {
-      const { page: Component } = await this.fetchComponent('/_error')
-      const routeInfo: RouteInfo = { Component, err, error: err }
+      const { page: Component, styleSheets } = await this.fetchComponent(
+        '/_error'
+      )
+      const routeInfo: PrivateRouteInfo = {
+        Component,
+        styleSheets,
+        err,
+        error: err,
+      }
 
       try {
         routeInfo.props = await this.getInitialProps(Component, {
@@ -689,7 +710,7 @@ export default class Router implements BaseRouter {
     query: any,
     as: string,
     shallow: boolean = false
-  ): Promise<RouteInfo> {
+  ): Promise<PrivateRouteInfo> {
     try {
       const cachedRouteInfo = this.components[route]
 
@@ -697,16 +718,14 @@ export default class Router implements BaseRouter {
         return cachedRouteInfo
       }
 
-      const routeInfo = cachedRouteInfo
+      const routeInfo: PrivateRouteInfo = cachedRouteInfo
         ? cachedRouteInfo
-        : await this.fetchComponent(route).then(
-            (res) =>
-              ({
-                Component: res.page,
-                __N_SSG: res.mod.__N_SSG,
-                __N_SSP: res.mod.__N_SSP,
-              } as RouteInfo)
-          )
+        : await this.fetchComponent(route).then((res) => ({
+            Component: res.page,
+            styleSheets: res.styleSheets,
+            __N_SSG: res.mod.__N_SSG,
+            __N_SSP: res.mod.__N_SSP,
+          }))
 
       const { Component, __N_SSG, __N_SSP } = routeInfo
 
@@ -724,12 +743,12 @@ export default class Router implements BaseRouter {
       if (__N_SSG || __N_SSP) {
         dataHref = this.pageLoader.getDataHref(
           formatWithValidation({ pathname, query }),
-          as,
+          delBasePath(as),
           __N_SSG
         )
       }
 
-      const props = await this._getData<RouteInfo>(() =>
+      const props = await this._getData<PrivateRouteInfo>(() =>
         __N_SSG
           ? this._getStaticData(dataHref!)
           : __N_SSP
@@ -757,7 +776,7 @@ export default class Router implements BaseRouter {
     pathname: string,
     query: ParsedUrlQuery,
     as: string,
-    data: RouteInfo
+    data: PrivateRouteInfo
   ): Promise<void> {
     this.isFallback = false
 
@@ -824,6 +843,30 @@ export default class Router implements BaseRouter {
     return this.asPath !== asPath
   }
 
+  _resolveHref(parsedHref: UrlObject, pages: string[]) {
+    const { pathname } = parsedHref
+    const cleanPathname = denormalizePagePath(delBasePath(pathname!))
+
+    if (cleanPathname === '/404' || cleanPathname === '/_error') {
+      return parsedHref
+    }
+
+    // handle resolving href for dynamic routes
+    if (!pages.includes(cleanPathname!)) {
+      // eslint-disable-next-line array-callback-return
+      pages.some((page) => {
+        if (
+          isDynamicRoute(page) &&
+          getRouteRegex(page).re.test(cleanPathname!)
+        ) {
+          parsedHref.pathname = addBasePath(page)
+          return true
+        }
+      })
+    }
+    return parsedHref
+  }
+
   /**
    * Prefetch page code, you may wait for the data during page rendering.
    * This feature only works in production!
@@ -835,11 +878,20 @@ export default class Router implements BaseRouter {
     asPath: string = url,
     options: PrefetchOptions = {}
   ): Promise<void> {
-    const parsed = tryParseRelativeUrl(url)
+    let parsed = tryParseRelativeUrl(url)
 
     if (!parsed) return
 
-    const { pathname } = parsed
+    let { pathname } = parsed
+
+    const pages = await this.pageLoader.getPageList()
+
+    parsed = this._resolveHref(parsed, pages) as typeof parsed
+
+    if (parsed.pathname !== pathname) {
+      pathname = parsed.pathname
+      url = formatWithValidation(parsed)
+    }
 
     // Prefetch is not supported in development mode because it would trigger on-demand-entries
     if (process.env.NODE_ENV !== 'production') {
@@ -853,7 +905,7 @@ export default class Router implements BaseRouter {
     ])
   }
 
-  async fetchComponent(route: string): Promise<ComponentRes> {
+  async fetchComponent(route: string): Promise<GoodPageCache> {
     let cancelled = false
     const cancel = (this.clc = () => {
       cancelled = true
@@ -917,7 +969,7 @@ export default class Router implements BaseRouter {
     ctx: NextPageContext
   ): Promise<any> {
     const { Component: App } = this.components['/_app']
-    const AppTree = this._wrapApp(App)
+    const AppTree = this._wrapApp(App as AppComponent)
     ctx.AppTree = AppTree
     return loadGetInitialProps<AppContextType<Router>>(App, {
       AppTree,
@@ -935,7 +987,7 @@ export default class Router implements BaseRouter {
     }
   }
 
-  notify(data: RouteInfo): Promise<void> {
-    return this.sub(data, this.components['/_app'].Component)
+  notify(data: PrivateRouteInfo): Promise<void> {
+    return this.sub(data, this.components['/_app'].Component as AppComponent)
   }
 }
diff --git a/packages/next/next-server/lib/router/utils/prepare-destination.ts b/packages/next/next-server/lib/router/utils/prepare-destination.ts
new file mode 100644
index 0000000000000..1e297a7fca89e
--- /dev/null
+++ b/packages/next/next-server/lib/router/utils/prepare-destination.ts
@@ -0,0 +1,134 @@
+import { ParsedUrlQuery } from 'querystring'
+import { searchParamsToUrlQuery } from './querystring'
+import { parseRelativeUrl } from './parse-relative-url'
+import * as pathToRegexp from 'next/dist/compiled/path-to-regexp'
+
+type Params = { [param: string]: any }
+
+export default function prepareDestination(
+  destination: string,
+  params: Params,
+  query: ParsedUrlQuery,
+  appendParamsToQuery: boolean,
+  basePath: string
+) {
+  let parsedDestination: {
+    query?: ParsedUrlQuery
+    protocol?: string
+    hostname?: string
+    port?: string
+  } & ReturnType<typeof parseRelativeUrl> = {} as any
+
+  if (destination.startsWith('/')) {
+    parsedDestination = parseRelativeUrl(destination)
+  } else {
+    const {
+      pathname,
+      searchParams,
+      hash,
+      hostname,
+      port,
+      protocol,
+      search,
+      href,
+    } = new URL(destination)
+
+    parsedDestination = {
+      pathname,
+      searchParams,
+      hash,
+      protocol,
+      hostname,
+      port,
+      search,
+      href,
+    }
+  }
+
+  parsedDestination.query = searchParamsToUrlQuery(
+    parsedDestination.searchParams
+  )
+  const destQuery = parsedDestination.query
+  const destPath = `${parsedDestination.pathname!}${
+    parsedDestination.hash || ''
+  }`
+  const destPathParamKeys: pathToRegexp.Key[] = []
+  pathToRegexp.pathToRegexp(destPath, destPathParamKeys)
+
+  const destPathParams = destPathParamKeys.map((key) => key.name)
+
+  let destinationCompiler = pathToRegexp.compile(
+    destPath,
+    // we don't validate while compiling the destination since we should
+    // have already validated before we got to this point and validating
+    // breaks compiling destinations with named pattern params from the source
+    // e.g. /something:hello(.*) -> /another/:hello is broken with validation
+    // since compile validation is meant for reversing and not for inserting
+    // params from a separate path-regex into another
+    { validate: false }
+  )
+  let newUrl
+
+  // update any params in query values
+  for (const [key, strOrArray] of Object.entries(destQuery)) {
+    let value = Array.isArray(strOrArray) ? strOrArray[0] : strOrArray
+    if (value) {
+      // the value needs to start with a forward-slash to be compiled
+      // correctly
+      value = `/${value}`
+      const queryCompiler = pathToRegexp.compile(value, { validate: false })
+      value = queryCompiler(params).substr(1)
+    }
+    destQuery[key] = value
+  }
+
+  // add path params to query if it's not a redirect and not
+  // already defined in destination query or path
+  const paramKeys = Object.keys(params)
+
+  if (
+    appendParamsToQuery &&
+    !paramKeys.some((key) => destPathParams.includes(key))
+  ) {
+    for (const key of paramKeys) {
+      if (!(key in destQuery)) {
+        destQuery[key] = params[key]
+      }
+    }
+  }
+
+  const shouldAddBasePath = destination.startsWith('/') && basePath
+
+  try {
+    newUrl = `${shouldAddBasePath ? basePath : ''}${encodeURI(
+      destinationCompiler(params)
+    )}`
+
+    const [pathname, hash] = newUrl.split('#')
+    parsedDestination.pathname = pathname
+    parsedDestination.hash = `${hash ? '#' : ''}${hash || ''}`
+    delete parsedDestination.search
+    delete parsedDestination.searchParams
+  } catch (err) {
+    if (err.message.match(/Expected .*? to not repeat, but got an array/)) {
+      throw new Error(
+        `To use a multi-match in the destination you must add \`*\` at the end of the param name to signify it should repeat. https://err.sh/vercel/next.js/invalid-multi-match`
+      )
+    }
+    throw err
+  }
+
+  // Query merge order lowest priority to highest
+  // 1. initial URL query values
+  // 2. path segment values
+  // 3. destination specified query values
+  parsedDestination.query = {
+    ...query,
+    ...parsedDestination.query,
+  }
+
+  return {
+    newUrl,
+    parsedDestination,
+  }
+}
diff --git a/packages/next/next-server/lib/router/utils/resolve-rewrites.ts b/packages/next/next-server/lib/router/utils/resolve-rewrites.ts
new file mode 100644
index 0000000000000..7ca29faa562a1
--- /dev/null
+++ b/packages/next/next-server/lib/router/utils/resolve-rewrites.ts
@@ -0,0 +1,44 @@
+import { ParsedUrlQuery } from 'querystring'
+import pathMatch from '../../../server/lib/path-match'
+import prepareDestination from './prepare-destination'
+import { Rewrite } from '../../../../lib/load-custom-routes'
+
+const customRouteMatcher = pathMatch(true)
+
+export default function resolveRewrites(
+  asPath: string,
+  pages: string[],
+  basePath: string,
+  rewrites: Rewrite[],
+  query: ParsedUrlQuery
+) {
+  if (!pages.includes(asPath)) {
+    for (const rewrite of rewrites) {
+      const matcher = customRouteMatcher(rewrite.source)
+      const params = matcher(asPath)
+
+      if (params) {
+        if (!rewrite.destination) {
+          // this is a proxied rewrite which isn't handled on the client
+          break
+        }
+        const destRes = prepareDestination(
+          rewrite.destination,
+          params,
+          query,
+          true,
+          rewrite.basePath === false ? '' : basePath
+        )
+        asPath = destRes.parsedDestination.pathname!
+        Object.assign(query, destRes.parsedDestination.query)
+
+        if (pages.includes(asPath)) {
+          // check if we now match a page as this means we are done
+          // resolving the rewrites
+          break
+        }
+      }
+    }
+  }
+  return asPath
+}
diff --git a/packages/next/next-server/lib/utils.ts b/packages/next/next-server/lib/utils.ts
index 37e7d58a0833f..ca0f1e0d28312 100644
--- a/packages/next/next-server/lib/utils.ts
+++ b/packages/next/next-server/lib/utils.ts
@@ -82,7 +82,7 @@ export type BaseContext = {
 }
 
 export type NEXT_DATA = {
-  props: any
+  props: Record<string, any>
   page: string
   query: ParsedUrlQuery
   buildId: string
@@ -103,7 +103,6 @@ export type NEXT_DATA = {
 /**
  * `Next` context
  */
-// tslint:disable-next-line interface-name
 export interface NextPageContext {
   /**
    * Error object if encountered during rendering
@@ -172,7 +171,6 @@ export type DocumentProps = DocumentInitialProps & {
   inAmpMode: boolean
   hybridAmp: boolean
   isDevelopment: boolean
-  files: string[]
   dynamicImports: ManifestItem[]
   assetPrefix?: string
   canonicalBase: string
diff --git a/packages/next/next-server/server/config.ts b/packages/next/next-server/server/config.ts
index bb75f1906de57..c9eefdca419a6 100644
--- a/packages/next/next-server/server/config.ts
+++ b/packages/next/next-server/server/config.ts
@@ -54,6 +54,7 @@ const defaultConfig: { [key: string]: any } = {
     optimizeFonts: false,
     optimizeImages: false,
     scrollRestoration: false,
+    unstable_webpack5cache: false,
   },
   future: {
     excludeDefaultMomentLocales: false,
diff --git a/packages/next/next-server/server/denormalize-page-path.ts b/packages/next/next-server/server/denormalize-page-path.ts
new file mode 100644
index 0000000000000..39ba36212f699
--- /dev/null
+++ b/packages/next/next-server/server/denormalize-page-path.ts
@@ -0,0 +1,13 @@
+export function normalizePathSep(path: string): string {
+  return path.replace(/\\/g, '/')
+}
+
+export function denormalizePagePath(page: string) {
+  page = normalizePathSep(page)
+  if (page.startsWith('/index/')) {
+    page = page.slice(6)
+  } else if (page === '/index') {
+    page = '/'
+  }
+  return page
+}
diff --git a/packages/next/next-server/server/get-page-files.ts b/packages/next/next-server/server/get-page-files.ts
index 1e5543ee744da..cd7dc93e660cb 100644
--- a/packages/next/next-server/server/get-page-files.ts
+++ b/packages/next/next-server/server/get-page-files.ts
@@ -1,26 +1,25 @@
 import { normalizePagePath, denormalizePagePath } from './normalize-page-path'
 
 export type BuildManifest = {
-  devFiles: string[]
-  ampDevFiles: string[]
-  polyfillFiles: string[]
-  lowPriorityFiles: string[]
+  devFiles: readonly string[]
+  ampDevFiles: readonly string[]
+  polyfillFiles: readonly string[]
+  lowPriorityFiles: readonly string[]
   pages: {
-    '/_app': string[]
-    [page: string]: string[]
+    '/_app': readonly string[]
+    [page: string]: readonly string[]
   }
-  ampFirstPages: string[]
+  ampFirstPages: readonly string[]
 }
 
 export function getPageFiles(
   buildManifest: BuildManifest,
   page: string
-): string[] {
+): readonly string[] {
   const normalizedPage = denormalizePagePath(normalizePagePath(page))
   let files = buildManifest.pages[normalizedPage]
 
   if (!files) {
-    // tslint:disable-next-line
     console.warn(
       `Could not find files for ${normalizedPage} in .next/build-manifest.json`
     )
diff --git a/packages/next/next-server/server/lib/path-match.ts b/packages/next/next-server/server/lib/path-match.ts
index 5d7f7f714ccc8..cbf785b5c6510 100644
--- a/packages/next/next-server/server/lib/path-match.ts
+++ b/packages/next/next-server/server/lib/path-match.ts
@@ -2,16 +2,25 @@ import * as pathToRegexp from 'next/dist/compiled/path-to-regexp'
 
 export { pathToRegexp }
 
+export const matcherOptions = {
+  sensitive: false,
+  delimiter: '/',
+  decode: decodeParam,
+}
+
+export const customRouteMatcherOptions = {
+  ...matcherOptions,
+  strict: true,
+}
+
 export default (customRoute = false) => {
   return (path: string) => {
     const keys: pathToRegexp.Key[] = []
-    const matcherOptions = {
-      sensitive: false,
-      delimiter: '/',
-      ...(customRoute ? { strict: true } : undefined),
-      decode: decodeParam,
-    }
-    const matcherRegex = pathToRegexp.pathToRegexp(path, keys, matcherOptions)
+    const matcherRegex = pathToRegexp.pathToRegexp(
+      path,
+      keys,
+      customRoute ? customRouteMatcherOptions : matcherOptions
+    )
     const matcher = pathToRegexp.regexpToFunction(
       matcherRegex,
       keys,
diff --git a/packages/next/next-server/server/next-server.ts b/packages/next/next-server/server/next-server.ts
index 2cb9a6e79663f..40b2f62f116b9 100644
--- a/packages/next/next-server/server/next-server.ts
+++ b/packages/next/next-server/server/next-server.ts
@@ -48,10 +48,10 @@ import Router, {
   DynamicRoutes,
   PageChecker,
   Params,
-  prepareDestination,
   route,
   Route,
 } from './router'
+import prepareDestination from '../lib/router/utils/prepare-destination'
 import { sendPayload } from './send-payload'
 import { serveStatic } from './serve-static'
 import { IncrementalCache } from './incremental-cache'
@@ -253,7 +253,6 @@ export default class Server {
       this.onErrorMiddleware({ err })
     }
     if (this.quiet) return
-    // tslint:disable-next-line
     console.error(err)
   }
 
@@ -784,6 +783,14 @@ export default class Server {
         name: 'public folder catchall',
         fn: async (req, res, params, parsedUrl) => {
           const pathParts: string[] = params.path || []
+          const { basePath } = this.nextConfig
+
+          // if basePath is defined require it be present
+          if (basePath) {
+            if (pathParts[0] !== basePath.substr(1)) return { finished: false }
+            pathParts.shift()
+          }
+
           const path = `/${pathParts.join('/')}`
 
           if (publicFiles.has(path)) {
diff --git a/packages/next/next-server/server/normalize-page-path.ts b/packages/next/next-server/server/normalize-page-path.ts
index bc8da584fc046..95e8d9a596c66 100644
--- a/packages/next/next-server/server/normalize-page-path.ts
+++ b/packages/next/next-server/server/normalize-page-path.ts
@@ -1,8 +1,6 @@
 import { posix } from 'path'
 
-export function normalizePathSep(path: string): string {
-  return path.replace(/\\/g, '/')
-}
+export { normalizePathSep, denormalizePagePath } from './denormalize-page-path'
 
 export function normalizePagePath(page: string): string {
   // If the page is `/` we need to append `/index`, otherwise the returned directory root will be bundles instead of pages
@@ -24,13 +22,3 @@ export function normalizePagePath(page: string): string {
   }
   return page
 }
-
-export function denormalizePagePath(page: string) {
-  page = normalizePathSep(page)
-  if (page.startsWith('/index/')) {
-    page = page.slice(6)
-  } else if (page === '/index') {
-    page = '/'
-  }
-  return page
-}
diff --git a/packages/next/next-server/server/render.tsx b/packages/next/next-server/server/render.tsx
index af3647e664971..c473467d6b875 100644
--- a/packages/next/next-server/server/render.tsx
+++ b/packages/next/next-server/server/render.tsx
@@ -27,6 +27,7 @@ import { HeadManagerContext } from '../lib/head-manager-context'
 import Loadable from '../lib/loadable'
 import { LoadableContext } from '../lib/loadable-context'
 import mitt, { MittEmitter } from '../lib/mitt'
+import postProcess from '../lib/post-process'
 import { RouterContext } from '../lib/router-context'
 import { NextRouter } from '../lib/router/router'
 import { isDynamicRoute } from '../lib/router/utils/is-dynamic'
@@ -42,11 +43,11 @@ import {
   RenderPage,
 } from '../lib/utils'
 import { tryGetPreviewData, __ApiPreviewProps } from './api-utils'
-import { getPageFiles } from './get-page-files'
+import { denormalizePagePath } from './denormalize-page-path'
+import { FontManifest, getFontDefinitionFromManifest } from './font-utils'
 import { LoadComponentsReturnType, ManifestItem } from './load-components'
+import { normalizePagePath } from './normalize-page-path'
 import optimizeAmp from './optimize-amp'
-import postProcess from '../lib/post-process'
-import { FontManifest, getFontDefinitionFromManifest } from './font-utils'
 
 function noRouter() {
   const message =
@@ -176,7 +177,6 @@ function renderDocument(
     ampState,
     inAmpMode,
     hybridAmp,
-    files,
     dynamicImports,
     headTags,
     gsp,
@@ -198,7 +198,6 @@ function renderDocument(
     hybridAmp: boolean
     dynamicImportsIds: string[]
     dynamicImports: ManifestItem[]
-    files: string[]
     headTags: any
     isFallback?: boolean
     gsp?: boolean
@@ -240,7 +239,6 @@ function renderDocument(
           inAmpMode,
           isDevelopment: !!dev,
           hybridAmp,
-          files,
           dynamicImports,
           assetPrefix,
           headTags,
@@ -329,7 +327,6 @@ export async function renderToHTML(
 
   const headTags = (...args: any) => callMiddleware('headTags', args)
 
-  const didRewrite = (req as any)._nextDidRewrite
   const isFallback = !!query.__nextFallback
   delete query.__nextFallback
 
@@ -360,23 +357,6 @@ export async function renderToHTML(
     }
   }
 
-  if (
-    process.env.NODE_ENV !== 'production' &&
-    (isAutoExport || isFallback) &&
-    pageIsDynamic &&
-    didRewrite
-  ) {
-    // TODO: If we decide to ship rewrites to the client we could
-    // solve this by running over the rewrites and getting the params.
-    throw new Error(
-      `Rewrites don't support${
-        isFallback ? ' ' : ' auto-exported '
-      }dynamic pages${isFallback ? ' with getStaticProps ' : ' '}yet.\n` +
-        `Using this will cause the page to fail to parse the params on the client\n` +
-        `See more info: https://err.sh/next.js/rewrite-auto-export-fallback`
-    )
-  }
-
   if (hasPageGetInitialProps && isSSG) {
     throw new Error(SSG_GET_INITIAL_PROPS_CONFLICT + ` ${pathname}`)
   }
@@ -690,17 +670,32 @@ export async function renderToHTML(
   // the response might be finished on the getInitialProps call
   if (isResSent(res) && !isSSG) return null
 
-  // AMP First pages do not have client-side JavaScript files
-  const files = ampState.ampFirst
-    ? []
-    : [
-        ...new Set([
-          ...getPageFiles(buildManifest, '/_app'),
-          ...(pathname !== '/_error'
-            ? getPageFiles(buildManifest, pathname)
-            : []),
-        ]),
-      ]
+  // we preload the buildManifest for auto-export dynamic pages
+  // to speed up hydrating query values
+  let filteredBuildManifest = buildManifest
+  if (isAutoExport && pageIsDynamic) {
+    const page = denormalizePagePath(normalizePagePath(pathname))
+    // This code would be much cleaner using `immer` and directly pushing into
+    // the result from `getPageFiles`, we could maybe consider that in the
+    // future.
+    if (page in filteredBuildManifest.pages) {
+      filteredBuildManifest = {
+        ...filteredBuildManifest,
+        pages: {
+          ...filteredBuildManifest.pages,
+          [page]: [
+            ...filteredBuildManifest.pages[page],
+            ...filteredBuildManifest.lowPriorityFiles.filter((f) =>
+              f.includes('_buildManifest')
+            ),
+          ],
+        },
+        lowPriorityFiles: filteredBuildManifest.lowPriorityFiles.filter(
+          (f) => !f.includes('_buildManifest')
+        ),
+      }
+    }
+  }
 
   const renderPage: RenderPage = (
     options: ComponentsEnhancer = {}
@@ -766,6 +761,7 @@ export async function renderToHTML(
 
   let html = renderDocument(Document, {
     ...renderOpts,
+    buildManifest: filteredBuildManifest,
     // Only enabled in production as development mode has features relying on HMR (style injection for example)
     unstable_runtimeJS:
       process.env.NODE_ENV === 'production'
@@ -784,7 +780,6 @@ export async function renderToHTML(
     hybridAmp,
     dynamicImportsIds,
     dynamicImports,
-    files,
     gsp: !!getStaticProps ? true : undefined,
     gssp: !!getServerSideProps ? true : undefined,
     gip: hasPageGetInitialProps ? true : undefined,
diff --git a/packages/next/next-server/server/require.ts b/packages/next/next-server/server/require.ts
index 28fca96a2cbc0..50234fde9e425 100644
--- a/packages/next/next-server/server/require.ts
+++ b/packages/next/next-server/server/require.ts
@@ -33,7 +33,6 @@ export function getPagePath(
   try {
     page = denormalizePagePath(normalizePagePath(page))
   } catch (err) {
-    // tslint:disable-next-line
     console.error(err)
     throw pageNotFoundError(page)
   }
diff --git a/packages/next/next-server/server/router.ts b/packages/next/next-server/server/router.ts
index f897d5720ab44..22473cfff5fcc 100644
--- a/packages/next/next-server/server/router.ts
+++ b/packages/next/next-server/server/router.ts
@@ -1,8 +1,8 @@
 import { IncomingMessage, ServerResponse } from 'http'
-import { parse as parseUrl, UrlWithParsedQuery } from 'url'
-import { ParsedUrlQuery } from 'querystring'
-import { compile as compilePathToRegex } from 'next/dist/compiled/path-to-regexp'
+import { UrlWithParsedQuery } from 'url'
+
 import pathMatch from './lib/path-match'
+import { removePathTrailingSlash } from '../../client/normalize-trailing-slash'
 
 export const route = pathMatch()
 
@@ -37,87 +37,8 @@ export type PageChecker = (pathname: string) => Promise<boolean>
 
 const customRouteTypes = new Set(['rewrite', 'redirect', 'header'])
 
-export const prepareDestination = (
-  destination: string,
-  params: Params,
-  query: ParsedUrlQuery,
-  appendParamsToQuery: boolean,
-  basePath: string
-) => {
-  const parsedDestination = parseUrl(destination, true)
-  const destQuery = parsedDestination.query
-  let destinationCompiler = compilePathToRegex(
-    `${parsedDestination.pathname!}${parsedDestination.hash || ''}`,
-    // we don't validate while compiling the destination since we should
-    // have already validated before we got to this point and validating
-    // breaks compiling destinations with named pattern params from the source
-    // e.g. /something:hello(.*) -> /another/:hello is broken with validation
-    // since compile validation is meant for reversing and not for inserting
-    // params from a separate path-regex into another
-    { validate: false }
-  )
-  let newUrl
-
-  // update any params in query values
-  for (const [key, strOrArray] of Object.entries(destQuery)) {
-    let value = Array.isArray(strOrArray) ? strOrArray[0] : strOrArray
-    if (value) {
-      // the value needs to start with a forward-slash to be compiled
-      // correctly
-      value = `/${value}`
-      const queryCompiler = compilePathToRegex(value, { validate: false })
-      value = queryCompiler(params).substr(1)
-    }
-    destQuery[key] = value
-  }
-
-  // add path params to query if it's not a redirect and not
-  // already defined in destination query
-  if (appendParamsToQuery) {
-    for (const [name, value] of Object.entries(params)) {
-      if (!(name in destQuery)) {
-        destQuery[name] = value
-      }
-    }
-  }
-
-  const shouldAddBasePath = destination.startsWith('/') && basePath
-
-  try {
-    newUrl = `${shouldAddBasePath ? basePath : ''}${encodeURI(
-      destinationCompiler(params)
-    )}`
-
-    const [pathname, hash] = newUrl.split('#')
-    parsedDestination.pathname = pathname
-    parsedDestination.hash = `${hash ? '#' : ''}${hash || ''}`
-    parsedDestination.path = `${pathname}${parsedDestination.search}`
-    delete parsedDestination.search
-  } catch (err) {
-    if (err.message.match(/Expected .*? to not repeat, but got an array/)) {
-      throw new Error(
-        `To use a multi-match in the destination you must add \`*\` at the end of the param name to signify it should repeat. https://err.sh/vercel/next.js/invalid-multi-match`
-      )
-    }
-    throw err
-  }
-
-  // Query merge order lowest priority to highest
-  // 1. initial URL query values
-  // 2. path segment values
-  // 3. destination specified query values
-  parsedDestination.query = {
-    ...query,
-    ...parsedDestination.query,
-  }
-
-  return {
-    newUrl,
-    parsedDestination,
-  }
-}
-
 function replaceBasePath(basePath: string, pathname: string) {
+  // If replace ends up replacing the full url it'll be `undefined`, meaning we have to default it to `/`
   return pathname!.replace(basePath, '') || '/'
 }
 
@@ -212,11 +133,13 @@ export default class Router {
               requireBasePath: false,
               match: route('/:path*'),
               fn: async (checkerReq, checkerRes, params, parsedCheckerUrl) => {
-                const { pathname } = parsedCheckerUrl
+                let { pathname } = parsedCheckerUrl
+                pathname = removePathTrailingSlash(pathname || '/')
 
                 if (!pathname) {
                   return { finished: false }
                 }
+
                 if (await memoizedPageChecker(pathname)) {
                   return this.catchAllRoute.fn(
                     checkerReq,
@@ -247,9 +170,10 @@ export default class Router {
       const originalPathname = currentPathname
       const requireBasePath = testRoute.requireBasePath !== false
       const isCustomRoute = customRouteTypes.has(testRoute.type)
+      const isPublicFolderCatchall = testRoute.name === 'public folder catchall'
+      const keepBasePath = isCustomRoute || isPublicFolderCatchall
 
-      if (!isCustomRoute) {
-        // If replace ends up replacing the full url it'll be `undefined`, meaning we have to default it to `/`
+      if (!keepBasePath) {
         currentPathname = replaceBasePath(this.basePath, currentPathname!)
       }
 
@@ -259,7 +183,7 @@ export default class Router {
       if (newParams) {
         // since we require basePath be present for non-custom-routes we
         // 404 here when we matched an fs route
-        if (!isCustomRoute) {
+        if (!keepBasePath) {
           if (!originallyHadBasePath && !(req as any)._nextDidRewrite) {
             if (requireBasePath) {
               // consider this a non-match so the 404 renders
@@ -282,7 +206,7 @@ export default class Router {
 
         // since the fs route didn't match we need to re-add the basePath
         // to continue checking rewrites with the basePath present
-        if (!isCustomRoute) {
+        if (!keepBasePath) {
           parsedUrlUpdated.pathname = originalPathname
         }
 
@@ -353,7 +277,6 @@ export default class Router {
         }
       }
     }
-
     return false
   }
 }
diff --git a/packages/next/package.json b/packages/next/package.json
index 1d488a4057392..488d8fab60dd0 100644
--- a/packages/next/package.json
+++ b/packages/next/package.json
@@ -1,6 +1,6 @@
 {
   "name": "next",
-  "version": "9.5.2",
+  "version": "9.5.3-canary.13",
   "description": "The React Framework",
   "main": "./dist/server/next.js",
   "license": "MIT",
@@ -77,8 +77,8 @@
     "@babel/preset-typescript": "7.9.0",
     "@babel/runtime": "7.9.6",
     "@babel/types": "7.9.6",
-    "@next/react-dev-overlay": "9.5.2",
-    "@next/react-refresh-utils": "9.5.2",
+    "@next/react-dev-overlay": "9.5.3-canary.13",
+    "@next/react-refresh-utils": "9.5.3-canary.13",
     "ast-types": "0.13.2",
     "babel-plugin-syntax-jsx": "6.18.0",
     "babel-plugin-transform-define": "2.0.0",
@@ -86,6 +86,7 @@
     "browserslist": "4.13.0",
     "buffer": "5.6.0",
     "cacache": "13.0.1",
+    "caniuse-lite": "^1.0.30001113",
     "chokidar": "2.1.8",
     "crypto-browserify": "3.12.0",
     "css-loader": "3.5.3",
@@ -103,7 +104,6 @@
     "postcss": "7.0.32",
     "process": "0.11.10",
     "prop-types": "15.7.2",
-    "prop-types-exact": "1.2.0",
     "react-is": "16.13.1",
     "react-refresh": "0.8.3",
     "resolve-url-loader": "3.1.1",
@@ -124,7 +124,7 @@
     "react-dom": "^16.6.0"
   },
   "devDependencies": {
-    "@next/polyfill-nomodule": "9.5.2",
+    "@next/polyfill-nomodule": "9.5.3-canary.13",
     "@taskr/clear": "1.1.0",
     "@taskr/esnext": "1.1.0",
     "@taskr/watch": "1.1.0",
@@ -192,7 +192,6 @@
     "is-wsl": "2.2.0",
     "json5": "2.1.3",
     "jsonwebtoken": "8.5.1",
-    "launch-editor": "2.2.1",
     "lodash.curry": "4.1.1",
     "lru-cache": "5.1.1",
     "nanoid": "2.0.3",
@@ -211,8 +210,8 @@
     "string-hash": "1.1.3",
     "strip-ansi": "6.0.0",
     "taskr": "1.1.0",
-    "terser": "4.4.2",
-    "terser-webpack-plugin": "3.0.8",
+    "terser": "5.1.0",
+    "terser-webpack-plugin": "4.1.0",
     "text-table": "0.2.0",
     "thread-loader": "2.1.3",
     "typescript": "3.8.3",
diff --git a/packages/next/pages/_document.tsx b/packages/next/pages/_document.tsx
index 992bd85e8499f..577b06ef22be4 100644
--- a/packages/next/pages/_document.tsx
+++ b/packages/next/pages/_document.tsx
@@ -1,5 +1,5 @@
 import PropTypes from 'prop-types'
-import React, { useContext, Component, ReactNode } from 'react'
+import React, { Component, ReactNode, useContext } from 'react'
 import flush from 'styled-jsx/server'
 import {
   AMP_RENDER_TARGET,
@@ -11,6 +11,10 @@ import {
   DocumentInitialProps,
   DocumentProps,
 } from '../next-server/lib/utils'
+import {
+  BuildManifest,
+  getPageFiles,
+} from '../next-server/server/get-page-files'
 import { cleanAmpPath } from '../next-server/server/utils'
 import { htmlEscapeJsonString } from '../server/htmlescape'
 
@@ -40,6 +44,27 @@ function getOptionalModernScriptVariant(path: string): string {
   return path
 }
 
+type DocumentFiles = {
+  sharedFiles: readonly string[]
+  pageFiles: readonly string[]
+  allFiles: readonly string[]
+}
+
+function getDocumentFiles(
+  buildManifest: BuildManifest,
+  pathname: string
+): DocumentFiles {
+  const sharedFiles: readonly string[] = getPageFiles(buildManifest, '/_app')
+  const pageFiles: readonly string[] =
+    pathname !== '/_error' ? getPageFiles(buildManifest, pathname) : []
+
+  return {
+    sharedFiles,
+    pageFiles,
+    allFiles: [...new Set([...sharedFiles, ...pageFiles])],
+  }
+}
+
 /**
  * `Document` component handles the initial `document` markup and renders only on the server side.
  * Commonly used for implementing server side rendering for `css-in-js` libraries.
@@ -126,13 +151,15 @@ export class Head extends Component<
 
   context!: React.ContextType<typeof DocumentComponentContext>
 
-  getCssLinks(): JSX.Element[] | null {
-    const { assetPrefix, files, devOnlyCacheBusterQueryString } = this.context
-    const cssFiles =
-      files && files.length ? files.filter((f) => f.endsWith('.css')) : []
+  getCssLinks(files: DocumentFiles): JSX.Element[] | null {
+    const { assetPrefix, devOnlyCacheBusterQueryString } = this.context
+    const cssFiles = files.allFiles.filter((f) => f.endsWith('.css'))
+    const sharedFiles = new Set(files.sharedFiles)
 
     const cssLinkElements: JSX.Element[] = []
     cssFiles.forEach((file) => {
+      const isSharedFile = sharedFiles.has(file)
+
       cssLinkElements.push(
         <link
           key={`${file}-preload`}
@@ -156,6 +183,8 @@ export class Head extends Component<
           crossOrigin={
             this.props.crossOrigin || process.env.__NEXT_CROSS_ORIGIN
           }
+          data-n-g={isSharedFile ? '' : undefined}
+          data-n-p={isSharedFile ? undefined : ''}
         />
       )
     })
@@ -200,18 +229,14 @@ export class Head extends Component<
     )
   }
 
-  getPreloadMainLinks(): JSX.Element[] | null {
-    const { assetPrefix, files, devOnlyCacheBusterQueryString } = this.context
-
-    const preloadFiles =
-      files && files.length
-        ? files.filter((file: string) => {
-            // `dynamicImports` will contain both `.js` and `.module.js` when
-            // the feature is enabled. This clause will filter down to the
-            // modern variants only.
-            return file.endsWith(getOptionalModernScriptVariant('.js'))
-          })
-        : []
+  getPreloadMainLinks(files: DocumentFiles): JSX.Element[] | null {
+    const { assetPrefix, devOnlyCacheBusterQueryString } = this.context
+    const preloadFiles = files.allFiles.filter((file: string) => {
+      // `dynamicImports` will contain both `.js` and `.module.js` when
+      // the feature is enabled. This clause will filter down to the
+      // modern variants only.
+      return file.endsWith(getOptionalModernScriptVariant('.js'))
+    })
 
     return !preloadFiles.length
       ? null
@@ -366,6 +391,10 @@ export class Head extends Component<
       })
     }
 
+    const files: DocumentFiles = getDocumentFiles(
+      this.context.buildManifest,
+      this.context.__NEXT_DATA__.page
+    )
     return (
       <head {...this.props}>
         {this.context.isDevelopment && (
@@ -452,10 +481,10 @@ export class Head extends Component<
               />
             )}
             {process.env.__NEXT_OPTIMIZE_FONTS
-              ? this.makeStylesheetInert(this.getCssLinks())
-              : this.getCssLinks()}
+              ? this.makeStylesheetInert(this.getCssLinks(files))
+              : this.getCssLinks(files)}
             {!disableRuntimeJS && this.getPreloadDynamicChunks()}
-            {!disableRuntimeJS && this.getPreloadMainLinks()}
+            {!disableRuntimeJS && this.getPreloadMainLinks(files)}
             {this.context.isDevelopment && (
               // this element is used to mount development styles so the
               // ordering matches production
@@ -491,11 +520,10 @@ export class NextScript extends Component<OriginProps> {
   static safariNomoduleFix =
     '!function(){var e=document,t=e.createElement("script");if(!("noModule"in t)&&"onbeforeload"in t){var n=!1;e.addEventListener("beforeload",function(e){if(e.target===t)n=!0;else if(!e.target.hasAttribute("nomodule")||!n)return;e.preventDefault()},!0),t.type="module",t.src=".",e.head.appendChild(t),t.remove()}}();'
 
-  getDynamicChunks() {
+  getDynamicChunks(files: DocumentFiles) {
     const {
       dynamicImports,
       assetPrefix,
-      files,
       isDevelopment,
       devOnlyCacheBusterQueryString,
     } = this.context
@@ -508,7 +536,7 @@ export class NextScript extends Component<OriginProps> {
           : { noModule: true }
       }
 
-      if (!bundle.file.endsWith('.js') || files.includes(bundle.file))
+      if (!bundle.file.endsWith('.js') || files.allFiles.includes(bundle.file))
         return null
 
       return (
@@ -528,16 +556,15 @@ export class NextScript extends Component<OriginProps> {
     })
   }
 
-  getScripts() {
+  getScripts(files: DocumentFiles) {
     const {
       assetPrefix,
-      files,
       buildManifest,
       isDevelopment,
       devOnlyCacheBusterQueryString,
     } = this.context
 
-    const normalScripts = files?.filter((file) => file.endsWith('.js'))
+    const normalScripts = files.allFiles.filter((file) => file.endsWith('.js'))
     const lowPriorityScripts = buildManifest.lowPriorityFiles?.filter((file) =>
       file.endsWith('.js')
     )
@@ -549,6 +576,7 @@ export class NextScript extends Component<OriginProps> {
           ? { type: 'module' }
           : { noModule: true }
       }
+
       return (
         <script
           key={file}
@@ -666,6 +694,10 @@ export class NextScript extends Component<OriginProps> {
         )
     }
 
+    const files: DocumentFiles = getDocumentFiles(
+      this.context.buildManifest,
+      this.context.__NEXT_DATA__.page
+    )
     return (
       <>
         {!disableRuntimeJS && buildManifest.devFiles
@@ -708,8 +740,8 @@ export class NextScript extends Component<OriginProps> {
           />
         ) : null}
         {!disableRuntimeJS && this.getPolyfillScripts()}
-        {disableRuntimeJS ? null : this.getDynamicChunks()}
-        {disableRuntimeJS ? null : this.getScripts()}
+        {disableRuntimeJS ? null : this.getDynamicChunks(files)}
+        {disableRuntimeJS ? null : this.getScripts(files)}
       </>
     )
   }
diff --git a/packages/next/server/hot-reloader.ts b/packages/next/server/hot-reloader.ts
index 5c7d8d7b37859..ba14fcb18e0e8 100644
--- a/packages/next/server/hot-reloader.ts
+++ b/packages/next/server/hot-reloader.ts
@@ -17,7 +17,6 @@ import {
 } from '../next-server/lib/constants'
 import { __ApiPreviewProps } from '../next-server/server/api-utils'
 import { route } from '../next-server/server/router'
-import errorOverlayMiddleware from './lib/error-overlay-middleware'
 import { findPageFile } from './lib/find-page-file'
 import onDemandEntryHandler, {
   entries,
@@ -31,6 +30,7 @@ import getRouteFromEntrypoint from '../next-server/server/get-route-from-entrypo
 import { isWriteable } from '../build/is-writeable'
 import { ClientPagesLoaderOptions } from '../build/webpack/loaders/next-client-pages-loader'
 import { stringify } from 'querystring'
+import { Rewrite } from '../lib/load-custom-routes'
 
 export async function renderScriptError(
   res: ServerResponse,
@@ -152,6 +152,7 @@ export default class HotReloader {
   private onDemandEntries: any
   private previewProps: __ApiPreviewProps
   private watcher: any
+  private rewrites: Rewrite[]
 
   constructor(
     dir: string,
@@ -160,11 +161,13 @@ export default class HotReloader {
       pagesDir,
       buildId,
       previewProps,
+      rewrites,
     }: {
       config: object
       pagesDir: string
       buildId: string
       previewProps: __ApiPreviewProps
+      rewrites: Rewrite[]
     }
   ) {
     this.buildId = buildId
@@ -178,6 +181,7 @@ export default class HotReloader {
 
     this.config = config
     this.previewProps = previewProps
+    this.rewrites = rewrites
   }
 
   public async run(
@@ -285,6 +289,7 @@ export default class HotReloader {
         config: this.config,
         buildId: this.buildId,
         pagesDir: this.pagesDir,
+        rewrites: this.rewrites,
         entrypoints: { ...entrypoints.client, ...additionalClientEntrypoints },
       }),
       getBaseWebpackConfig(this.dir, {
@@ -293,6 +298,7 @@ export default class HotReloader {
         config: this.config,
         buildId: this.buildId,
         pagesDir: this.pagesDir,
+        rewrites: this.rewrites,
         entrypoints: entrypoints.server,
       }),
     ])
@@ -470,7 +476,6 @@ export default class HotReloader {
       // must come before hotMiddleware
       this.onDemandEntries.middleware,
       this.webpackHotMiddleware.middleware,
-      errorOverlayMiddleware({ dir: this.dir }),
       getOverlayMiddleware({
         rootDirectory: this.dir,
         stats: () => this.stats,
@@ -509,7 +514,7 @@ export default class HotReloader {
     return []
   }
 
-  private send(action: string, ...args: any[]): void {
+  public send(action?: string, ...args: any[]): void {
     this.webpackHotMiddleware!.publish({ action, data: args })
   }
 
diff --git a/packages/next/server/lib/error-overlay-middleware.ts b/packages/next/server/lib/error-overlay-middleware.ts
deleted file mode 100644
index c5d3d81d3821f..0000000000000
--- a/packages/next/server/lib/error-overlay-middleware.ts
+++ /dev/null
@@ -1,26 +0,0 @@
-import url from 'url'
-import launchEditor from 'next/dist/compiled/launch-editor'
-import fs from 'fs'
-import path from 'path'
-import { IncomingMessage, ServerResponse } from 'http'
-
-export default function errorOverlayMiddleware(options: { dir: string }) {
-  return (req: IncomingMessage, res: ServerResponse, next: Function) => {
-    if (req.url!.startsWith('/_next/development/open-stack-frame-in-editor')) {
-      const query = url.parse(req.url!, true).query
-      const lineNumber = parseInt(query.lineNumber as string, 10) || 1
-      const colNumber = parseInt(query.colNumber as string, 10) || 1
-
-      let resolvedFileName = query.fileName
-
-      if (!fs.existsSync(resolvedFileName as string)) {
-        resolvedFileName = path.join(options.dir, resolvedFileName as string)
-      }
-
-      launchEditor(`${resolvedFileName}:${lineNumber}:${colNumber}`)
-      res.end()
-    } else {
-      next()
-    }
-  }
-}
diff --git a/packages/next/server/lib/utils.ts b/packages/next/server/lib/utils.ts
index 296601ecbbb56..578992683c8e5 100644
--- a/packages/next/server/lib/utils.ts
+++ b/packages/next/server/lib/utils.ts
@@ -1,6 +1,5 @@
 export function printAndExit(message: string, code = 1) {
   if (code === 0) {
-    // tslint:disable-next-line no-console
     console.log(message)
   } else {
     console.error(message)
diff --git a/packages/next/server/next-dev-server.ts b/packages/next/server/next-dev-server.ts
index 14dde763658d0..f8c0042cb255d 100644
--- a/packages/next/server/next-dev-server.ts
+++ b/packages/next/server/next-dev-server.ts
@@ -16,7 +16,11 @@ import { fileExists } from '../lib/file-exists'
 import { findPagesDir } from '../lib/find-pages-dir'
 import loadCustomRoutes, { CustomRoutes } from '../lib/load-custom-routes'
 import { verifyTypeScriptSetup } from '../lib/verifyTypeScriptSetup'
-import { PHASE_DEVELOPMENT_SERVER } from '../next-server/lib/constants'
+import {
+  PHASE_DEVELOPMENT_SERVER,
+  CLIENT_STATIC_FILES_PATH,
+  DEV_CLIENT_PAGES_MANIFEST,
+} from '../next-server/lib/constants'
 import {
   getRouteMatcher,
   getRouteRegex,
@@ -46,6 +50,8 @@ export default class DevServer extends Server {
   private webpackWatcher?: Watchpack | null
   private hotReloader?: HotReloader
   private isCustomServer: boolean
+  protected sortedRoutes?: string[]
+
   protected staticPathsWorker: import('jest-worker').default & {
     loadStaticPaths: typeof import('./static-paths-worker').loadStaticPaths
   }
@@ -206,8 +212,22 @@ export default class DevServer extends Server {
 
           routedPages.push(pageName)
         }
+
         try {
-          this.dynamicRoutes = getSortedRoutes(routedPages)
+          // we serve a separate manifest with all pages for the client in
+          // dev mode so that we can match a page after a rewrite on the client
+          // before it has been built and is populated in the _buildManifest
+          const sortedRoutes = getSortedRoutes(routedPages)
+
+          if (
+            !this.sortedRoutes?.every((val, idx) => val === sortedRoutes[idx])
+          ) {
+            // emit the change so clients fetch the update
+            this.hotReloader!.send(undefined, { devPagesManifest: true })
+          }
+          this.sortedRoutes = sortedRoutes
+
+          this.dynamicRoutes = this.sortedRoutes
             .filter(isDynamicRoute)
             .map((page) => ({
               page,
@@ -257,6 +277,7 @@ export default class DevServer extends Server {
       config: this.nextConfig,
       previewProps: this.getPreviewProps(),
       buildId: this.buildId,
+      rewrites: this.customRoutes.rewrites,
     })
     await super.prepare()
     await this.addExportPathMapRoutes()
@@ -411,6 +432,26 @@ export default class DevServer extends Server {
       },
     })
 
+    fsRoutes.unshift({
+      match: route(
+        `/_next/${CLIENT_STATIC_FILES_PATH}/${this.buildId}/${DEV_CLIENT_PAGES_MANIFEST}`
+      ),
+      type: 'route',
+      name: `_next/${CLIENT_STATIC_FILES_PATH}/${this.buildId}/${DEV_CLIENT_PAGES_MANIFEST}`,
+      fn: async (_req, res) => {
+        res.statusCode = 200
+        res.setHeader('Content-Type', 'application/json; charset=utf-8')
+        res.end(
+          JSON.stringify({
+            pages: this.sortedRoutes,
+          })
+        )
+        return {
+          finished: true,
+        }
+      },
+    })
+
     fsRoutes.push({
       match: route('/:path*'),
       type: 'route',
diff --git a/packages/next/taskfile.js b/packages/next/taskfile.js
index a6a8895557346..755001996804c 100644
--- a/packages/next/taskfile.js
+++ b/packages/next/taskfile.js
@@ -302,14 +302,6 @@ export async function ncc_jsonwebtoken(task, opts) {
     .target('compiled/jsonwebtoken')
 }
 // eslint-disable-next-line camelcase
-externals['launch-editor'] = 'next/dist/compiled/launch-editor'
-export async function ncc_launch_editor(task, opts) {
-  await task
-    .source(opts.src || relative(__dirname, require.resolve('launch-editor')))
-    .ncc({ packageName: 'launch-editor', externals })
-    .target('compiled/launch-editor')
-}
-// eslint-disable-next-line camelcase
 externals['lodash.curry'] = 'next/dist/compiled/lodash.curry'
 export async function ncc_lodash_curry(task, opts) {
   await task
@@ -547,7 +539,6 @@ export async function ncc(task) {
       'ncc_is_wsl',
       'ncc_json5',
       'ncc_jsonwebtoken',
-      'ncc_launch_editor',
       'ncc_lodash_curry',
       'ncc_lru_cache',
       'ncc_nanoid',
diff --git a/packages/next/types/misc.d.ts b/packages/next/types/misc.d.ts
index e4c43b86b3a71..cbc1f67ef95ae 100644
--- a/packages/next/types/misc.d.ts
+++ b/packages/next/types/misc.d.ts
@@ -6,7 +6,6 @@ declare module 'cssnano-simple' {
   const cssnanoSimple: Plugin<{}>
   export = cssnanoSimple
 }
-declare module 'launch-editor'
 declare module 'styled-jsx/server'
 declare module 'unfetch'
 declare module 'webpack/lib/GraphHelpers'
@@ -130,10 +129,6 @@ declare module 'next/dist/compiled/jsonwebtoken' {
   import m from 'jsonwebtoken'
   export = m
 }
-declare module 'next/dist/compiled/launch-editor' {
-  import m from 'launch-editor'
-  export = m
-}
 declare module 'next/dist/compiled/lodash.curry' {
   import m from 'lodash.curry'
   export = m
diff --git a/packages/next/types/webpack.d.ts b/packages/next/types/webpack.d.ts
index 5712472d1326b..eac5cc0ffbb5d 100644
--- a/packages/next/types/webpack.d.ts
+++ b/packages/next/types/webpack.d.ts
@@ -600,7 +600,6 @@ declare module 'webpack' {
     type Rule = RuleSetRule
 
     namespace Options {
-      // tslint:disable-next-line:max-line-length
       type Devtool =
         | 'eval'
         | 'inline-source-map'
@@ -869,13 +868,10 @@ declare module 'webpack' {
         modulesSize(): number
         size(options: any): number
         integratedSize(otherChunk: any, options: any): number
-        // tslint:disable-next-line:ban-types
         sortModules(sortByFn: Function): void
         getAllAsyncChunks(): Set<any>
         getChunkMaps(realHash: any): { hash: any; name: any }
-        // tslint:disable-next-line:ban-types
         getChunkModuleMaps(filterFn: Function): { id: any; hash: any }
-        // tslint:disable-next-line:ban-types
         hasModuleInGraph(filterFn: Function, filterChunkFn: Function): boolean
         toString(): string
       }
@@ -1132,7 +1128,6 @@ declare module 'webpack' {
         hash?: string
         getStats(): Stats
         addModule(module: CompilationModule, cacheGroup: any): any
-        // tslint:disable-next-line:ban-types
         addEntry(context: any, entry: any, name: any, callback: Function): void
         getPath(
           filename: string,
@@ -1256,7 +1251,6 @@ declare module 'webpack' {
         watchRun: any
       }
     }
-    // tslint:disable-next-line:interface-name
     interface ICompiler {
       run(handler: ICompiler.Handler): void
       watch(
@@ -1877,7 +1871,6 @@ declare module 'webpack' {
     }
 
     class PrefetchPlugin extends Plugin {
-      // tslint:disable-next-line:unified-signatures
       constructor(context: any, request: any)
       constructor(request: any)
     }
@@ -2363,7 +2356,6 @@ declare module 'webpack' {
     /** @deprecated */
     namespace compiler {
       /** @deprecated use webpack.Compiler */
-      // tslint:disable-next-line:no-unnecessary-qualifier
       type Compiler = webpack.Compiler
 
       /** @deprecated use webpack.Compiler.Watching */
@@ -2374,7 +2366,6 @@ declare module 'webpack' {
       type WatchOptions = Compiler.WatchOptions
 
       /** @deprecated use webpack.Stats */
-      // tslint:disable-next-line:no-unnecessary-qualifier
       type Stats = webpack.Stats
 
       /** @deprecated use webpack.Stats.ToJsonOptions */
diff --git a/packages/react-dev-overlay/package.json b/packages/react-dev-overlay/package.json
index 82171d7781168..67e446c6505d3 100644
--- a/packages/react-dev-overlay/package.json
+++ b/packages/react-dev-overlay/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/react-dev-overlay",
-  "version": "9.5.2",
+  "version": "9.5.3-canary.13",
   "description": "A development-only overlay for developing React applications.",
   "repository": {
     "url": "vercel/next.js",
diff --git a/packages/react-refresh-utils/package.json b/packages/react-refresh-utils/package.json
index 99b9ce5ea3810..27112d9fde0e7 100644
--- a/packages/react-refresh-utils/package.json
+++ b/packages/react-refresh-utils/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/react-refresh-utils",
-  "version": "9.5.2",
+  "version": "9.5.3-canary.13",
   "description": "An experimental package providing utilities for React Refresh.",
   "repository": {
     "url": "vercel/next.js",
diff --git a/test/acceptance/ReactRefreshLogBox.test.js b/test/acceptance/ReactRefreshLogBox.test.js
index 7f3e59e9fd50b..a57cb7e831e99 100644
--- a/test/acceptance/ReactRefreshLogBox.test.js
+++ b/test/acceptance/ReactRefreshLogBox.test.js
@@ -683,10 +683,8 @@ test('Module not found', async () => {
 
   await session.patch(
     'index.js',
-    `
-      import Comp from 'b'
-
-      export default () => {
+    `import Comp from 'b'
+      export default function Oops() {
         return (
           <div>
             <Comp>lol</Comp>
@@ -700,14 +698,12 @@ test('Module not found', async () => {
 
   const source = await session.getRedboxSource()
   expect(source).toMatchInlineSnapshot(`
-    "./index.js:2:6
+    "./index.js:1:0
     Module not found: Can't resolve 'b'
-      1 | 
-    > 2 |       import Comp from 'b'
-        |      ^
-      3 | 
-      4 |       export default () => {
-      5 |         return ("
+    > 1 | import Comp from 'b'
+      2 |       export default function Oops() {
+      3 |         return (
+      4 |           <div>"
   `)
 
   await cleanup()
@@ -1077,3 +1073,165 @@ test('logbox: anchors links in error messages', async () => {
 
   await cleanup()
 })
+
+test('<Link> component props errors', async () => {
+  const [session, cleanup] = await sandbox()
+
+  await session.patch(
+    'index.js',
+    `
+      import Link from 'next/link'
+
+      export default function Hello() {
+        return <Link />
+      }
+    `
+  )
+
+  expect(await session.hasRedbox(true)).toBe(true)
+  expect(await session.getRedboxDescription()).toMatchInlineSnapshot(
+    `"Error: Failed prop type: The prop \`href\` expects a \`string\` or \`object\` in \`<Link>\`, but got \`undefined\` instead."`
+  )
+
+  await session.patch(
+    'index.js',
+    `
+      import Link from 'next/link'
+
+      export default function Hello() {
+        return <Link href="/">Abc</Link>
+      }
+    `
+  )
+  expect(await session.hasRedbox()).toBe(false)
+
+  await session.patch(
+    'index.js',
+    `
+      import Link from 'next/link'
+
+      export default function Hello() {
+        return (
+          <Link
+            href="/"
+            as="/"
+            replace={false}
+            scroll={false}
+            shallow={false}
+            passHref={false}
+            prefetch={false}
+          >
+            Abc
+          </Link>
+        )
+      }
+    `
+  )
+  expect(await session.hasRedbox()).toBe(false)
+
+  await session.patch(
+    'index.js',
+    `
+      import Link from 'next/link'
+
+      export default function Hello() {
+        return (
+          <Link
+            href="/"
+            as="/"
+            replace={true}
+            scroll={true}
+            shallow={true}
+            passHref={true}
+            prefetch={true}
+          >
+            Abc
+          </Link>
+        )
+      }
+    `
+  )
+  expect(await session.hasRedbox()).toBe(false)
+
+  await session.patch(
+    'index.js',
+    `
+      import Link from 'next/link'
+
+      export default function Hello() {
+        return (
+          <Link
+            href="/"
+            as="/"
+            replace={undefined}
+            scroll={undefined}
+            shallow={undefined}
+            passHref={undefined}
+            prefetch={undefined}
+          >
+            Abc
+          </Link>
+        )
+      }
+    `
+  )
+  expect(await session.hasRedbox()).toBe(false)
+
+  await session.patch(
+    'index.js',
+    `
+      import Link from 'next/link'
+
+      export default function Hello() {
+        return (
+          <Link
+            href="/"
+            as="/"
+            replace={undefined}
+            scroll={'oops'}
+            shallow={undefined}
+            passHref={undefined}
+            prefetch={undefined}
+          >
+            Abc
+          </Link>
+        )
+      }
+    `
+  )
+  expect(await session.hasRedbox(true)).toBe(true)
+  expect(await session.getRedboxDescription()).toMatchInlineSnapshot(`
+    "Error: Failed prop type: The prop \`scroll\` expects a \`boolean\` in \`<Link>\`, but got \`string\` instead.
+    Open your browser's console to view the Component stack trace."
+  `)
+
+  await session.patch(
+    'index.js',
+    `
+      import Link from 'next/link'
+
+      export default function Hello() {
+        return (
+          <Link
+            href={false}
+            as="/"
+            replace={undefined}
+            scroll={'oops'}
+            shallow={undefined}
+            passHref={undefined}
+            prefetch={undefined}
+          >
+            Abc
+          </Link>
+        )
+      }
+    `
+  )
+  expect(await session.hasRedbox(true)).toBe(true)
+  expect(await session.getRedboxDescription()).toMatchInlineSnapshot(`
+    "Error: Failed prop type: The prop \`href\` expects a \`string\` or \`object\` in \`<Link>\`, but got \`boolean\` instead.
+    Open your browser's console to view the Component stack trace."
+  `)
+
+  await cleanup()
+})
diff --git a/test/integration/amphtml/pages/nav.js b/test/integration/amphtml/pages/nav.js
index f3d38a2491d24..2cc684c0dca30 100644
--- a/test/integration/amphtml/pages/nav.js
+++ b/test/integration/amphtml/pages/nav.js
@@ -12,6 +12,11 @@ export default function Nav() {
           <a id="only-amp-link">AMP First Page</a>
         </Link>
       </li>
+      <li>
+        <Link href="/var-before-export">
+          <a id="var-before-export-link">Another AMP First Page</a>
+        </Link>
+      </li>
     </ul>
   )
 }
diff --git a/test/integration/amphtml/pages/var-before-export.js b/test/integration/amphtml/pages/var-before-export.js
new file mode 100644
index 0000000000000..31fdc2a36b226
--- /dev/null
+++ b/test/integration/amphtml/pages/var-before-export.js
@@ -0,0 +1,12 @@
+const config = { amp: true }
+
+const Page = () => {
+  return (
+    <div>
+      <p id="var-before-export">Only AMP for me...</p>
+    </div>
+  )
+}
+
+export default Page
+export { config }
diff --git a/test/integration/amphtml/test/index.test.js b/test/integration/amphtml/test/index.test.js
index a9e730f94834f..37779e0d010f4 100644
--- a/test/integration/amphtml/test/index.test.js
+++ b/test/integration/amphtml/test/index.test.js
@@ -74,6 +74,15 @@ describe('AMP Usage', () => {
         expect(result).toBe(null)
       })
 
+      it('should not output client pages for AMP only with config exported after declaration', async () => {
+        const browser = await webdriver(appPort, '/nav')
+        await browser.elementByCss('#var-before-export-link').click()
+
+        const result = await browser.eval('window.NAV_PAGE_LOADED')
+
+        expect(result).toBe(null)
+      })
+
       it('should add link preload for amp script', async () => {
         const html = await renderViaHTTP(appPort, '/?amp=1')
         await validateAMP(html)
@@ -267,6 +276,15 @@ describe('AMP Usage', () => {
 
       expect(result).toBe(null)
     })
+
+    it('should not output client pages for AMP only with config exported after declaration', async () => {
+      const browser = await webdriver(appPort, '/nav')
+      await browser.elementByCss('#var-before-export-link').click()
+
+      const result = await browser.eval('window.NAV_PAGE_LOADED')
+
+      expect(result).toBe(null)
+    })
   })
 
   describe('AMP dev no-warn', () => {
diff --git a/test/integration/basepath-root-catch-all/next.config.js b/test/integration/basepath-root-catch-all/next.config.js
new file mode 100644
index 0000000000000..acffd20df397d
--- /dev/null
+++ b/test/integration/basepath-root-catch-all/next.config.js
@@ -0,0 +1,4 @@
+module.exports = {
+  // target: 'experimental-serverless-trace',
+  basePath: '/docs',
+}
diff --git a/test/integration/basepath-root-catch-all/pages/[...parts].js b/test/integration/basepath-root-catch-all/pages/[...parts].js
new file mode 100644
index 0000000000000..9f4067f135c75
--- /dev/null
+++ b/test/integration/basepath-root-catch-all/pages/[...parts].js
@@ -0,0 +1,14 @@
+export default ({ url }) => (
+  <>
+    <h1>root catch-all</h1>
+    <p id="url">{url}</p>
+  </>
+)
+
+export const getServerSideProps = ({ req, res }) => {
+  return {
+    props: {
+      url: req.url,
+    },
+  }
+}
diff --git a/test/integration/basepath-root-catch-all/pages/hello.js b/test/integration/basepath-root-catch-all/pages/hello.js
new file mode 100644
index 0000000000000..0b043d1e5fd26
--- /dev/null
+++ b/test/integration/basepath-root-catch-all/pages/hello.js
@@ -0,0 +1,7 @@
+import Link from 'next/link'
+
+export default () => (
+  <Link href="/[...parts]" as="/root/catch-all">
+    <a id="root-catchall-link">root catch-all</a>
+  </Link>
+)
diff --git a/test/integration/basepath-root-catch-all/test/index.test.js b/test/integration/basepath-root-catch-all/test/index.test.js
new file mode 100644
index 0000000000000..12bd55da1e707
--- /dev/null
+++ b/test/integration/basepath-root-catch-all/test/index.test.js
@@ -0,0 +1,69 @@
+import {
+  nextBuild,
+  findPort,
+  killApp,
+  nextStart,
+  File,
+  launchApp,
+} from 'next-test-utils'
+import webdriver from 'next-webdriver'
+import { join } from 'path'
+import fs from 'fs-extra'
+import url from 'url'
+
+let app
+let appPort
+let buildId
+const appDir = join(__dirname, '..')
+const nextConfig = new File(join(appDir, 'next.config.js'))
+
+jest.setTimeout(1000 * 60 * 2)
+
+const runTests = () => {
+  it('should use correct data URL for root catch-all', async () => {
+    const browser = await webdriver(appPort, '/docs/hello')
+    await browser.elementByCss('#root-catchall-link').click()
+    await browser.waitForElementByCss('#url')
+
+    const dataUrl = await browser.elementByCss('#url').text()
+    const { pathname } = url.parse(dataUrl)
+    expect(pathname).toBe(`/_next/data/${buildId}/root/catch-all.json`)
+  })
+}
+
+describe('dev mode', () => {
+  beforeAll(async () => {
+    await nextBuild(appDir)
+    appPort = await findPort()
+    buildId = 'development'
+    app = await launchApp(appDir, appPort)
+  })
+  afterAll(() => killApp(app))
+  runTests()
+})
+
+describe('production mode', () => {
+  beforeAll(async () => {
+    await nextBuild(appDir)
+    buildId = await fs.readFile(join(appDir, '.next/BUILD_ID'), 'utf8')
+    appPort = await findPort()
+    app = await nextStart(appDir, appPort)
+  })
+  afterAll(() => killApp(app))
+  runTests()
+})
+
+describe('serverless mode', () => {
+  beforeAll(async () => {
+    nextConfig.replace('// target', 'target')
+    await nextBuild(appDir)
+    buildId = await fs.readFile(join(appDir, '.next/BUILD_ID'), 'utf8')
+    appPort = await findPort()
+    app = await nextStart(appDir, appPort)
+  })
+  afterAll(async () => {
+    nextConfig.restore()
+    await killApp(app)
+  })
+  runTests()
+})
diff --git a/test/integration/basepath/public/data.txt b/test/integration/basepath/public/data.txt
new file mode 100644
index 0000000000000..95d09f2b10159
--- /dev/null
+++ b/test/integration/basepath/public/data.txt
@@ -0,0 +1 @@
+hello world
\ No newline at end of file
diff --git a/test/integration/basepath/test/index.test.js b/test/integration/basepath/test/index.test.js
index f2e64a5ae598d..bc12692064d23 100644
--- a/test/integration/basepath/test/index.test.js
+++ b/test/integration/basepath/test/index.test.js
@@ -135,6 +135,17 @@ const runTests = (context, dev = false) => {
     })
   }
 
+  it('should 404 for public file without basePath', async () => {
+    const res = await fetchViaHTTP(context.appPort, '/data.txt')
+    expect(res.status).toBe(404)
+  })
+
+  it('should serve public file with basePath correctly', async () => {
+    const res = await fetchViaHTTP(context.appPort, '/docs/data.txt')
+    expect(res.status).toBe(200)
+    expect(await res.text()).toBe('hello world')
+  })
+
   it('should rewrite with basePath by default', async () => {
     const html = await renderViaHTTP(context.appPort, '/docs/rewrite-1')
     expect(html).toContain('getServerSideProps')
diff --git a/test/integration/build-output/test/index.test.js b/test/integration/build-output/test/index.test.js
index 01adfb3cb6703..09132372afc02 100644
--- a/test/integration/build-output/test/index.test.js
+++ b/test/integration/build-output/test/index.test.js
@@ -94,17 +94,17 @@ describe('Build Output', () => {
       expect(parseFloat(indexSize) - 265).toBeLessThanOrEqual(0)
       expect(indexSize.endsWith('B')).toBe(true)
 
-      // should be no bigger than 60 kb
-      expect(parseFloat(indexFirstLoad) - 60).toBeLessThanOrEqual(0)
+      // should be no bigger than 60.1 kb
+      expect(parseFloat(indexFirstLoad) - 60.1).toBeLessThanOrEqual(0)
       expect(indexFirstLoad.endsWith('kB')).toBe(true)
 
-      expect(parseFloat(err404Size) - 3.6).toBeLessThanOrEqual(0)
+      expect(parseFloat(err404Size) - 3.8).toBeLessThanOrEqual(0)
       expect(err404Size.endsWith('kB')).toBe(true)
 
-      expect(parseFloat(err404FirstLoad) - 63).toBeLessThanOrEqual(0)
+      expect(parseFloat(err404FirstLoad) - 63.3).toBeLessThanOrEqual(0)
       expect(err404FirstLoad.endsWith('kB')).toBe(true)
 
-      expect(parseFloat(sharedByAll) - 59.4).toBeLessThanOrEqual(0)
+      expect(parseFloat(sharedByAll) - 59.8).toBeLessThanOrEqual(0)
       expect(sharedByAll.endsWith('kB')).toBe(true)
 
       if (_appSize.endsWith('kB')) {
@@ -118,7 +118,7 @@ describe('Build Output', () => {
       expect(parseFloat(webpackSize) - 752).toBeLessThanOrEqual(0)
       expect(webpackSize.endsWith(' B')).toBe(true)
 
-      expect(parseFloat(mainSize) - 6.5).toBeLessThanOrEqual(0)
+      expect(parseFloat(mainSize) - 7).toBeLessThanOrEqual(0)
       expect(mainSize.endsWith('kB')).toBe(true)
 
       expect(parseFloat(frameworkSize) - 41).toBeLessThanOrEqual(0)
diff --git a/test/integration/cli/experimental-react-dom/.gitignore b/test/integration/cli/experimental-react-dom/.gitignore
new file mode 100644
index 0000000000000..cf4bab9ddde9f
--- /dev/null
+++ b/test/integration/cli/experimental-react-dom/.gitignore
@@ -0,0 +1 @@
+!node_modules
diff --git a/test/integration/cli/experimental-react-dom/node_modules/react-dom/index.js b/test/integration/cli/experimental-react-dom/node_modules/react-dom/index.js
new file mode 100644
index 0000000000000..27d7f6e85eb30
--- /dev/null
+++ b/test/integration/cli/experimental-react-dom/node_modules/react-dom/index.js
@@ -0,0 +1 @@
+module.exports = { Suspense: true }
diff --git a/test/integration/cli/experimental-react-dom/node_modules/react-dom/package.json b/test/integration/cli/experimental-react-dom/node_modules/react-dom/package.json
new file mode 100644
index 0000000000000..7054edc674ccd
--- /dev/null
+++ b/test/integration/cli/experimental-react-dom/node_modules/react-dom/package.json
@@ -0,0 +1,4 @@
+{
+  "name": "react-dom",
+  "version": "0.0.0-experimental-94c0244ba"
+}
diff --git a/test/integration/cli/experimental-react-dom/package.json b/test/integration/cli/experimental-react-dom/package.json
new file mode 100644
index 0000000000000..be823a58af7d7
--- /dev/null
+++ b/test/integration/cli/experimental-react-dom/package.json
@@ -0,0 +1,6 @@
+{
+  "dependencies": {
+    "react": "*",
+    "react-dom": "*"
+  }
+}
diff --git a/test/integration/cli/experimental-react-dom/pages/index.js b/test/integration/cli/experimental-react-dom/pages/index.js
new file mode 100644
index 0000000000000..8f6a8e1b41548
--- /dev/null
+++ b/test/integration/cli/experimental-react-dom/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <p>Hello</p>
+}
diff --git a/test/integration/cli/experimental-react/.gitignore b/test/integration/cli/experimental-react/.gitignore
new file mode 100644
index 0000000000000..cf4bab9ddde9f
--- /dev/null
+++ b/test/integration/cli/experimental-react/.gitignore
@@ -0,0 +1 @@
+!node_modules
diff --git a/test/integration/cli/experimental-react/node_modules/react/index.js b/test/integration/cli/experimental-react/node_modules/react/index.js
new file mode 100644
index 0000000000000..27d7f6e85eb30
--- /dev/null
+++ b/test/integration/cli/experimental-react/node_modules/react/index.js
@@ -0,0 +1 @@
+module.exports = { Suspense: true }
diff --git a/test/integration/cli/experimental-react/node_modules/react/package.json b/test/integration/cli/experimental-react/node_modules/react/package.json
new file mode 100644
index 0000000000000..0b8539882bcda
--- /dev/null
+++ b/test/integration/cli/experimental-react/node_modules/react/package.json
@@ -0,0 +1,4 @@
+{
+  "name": "react",
+  "version": "0.0.0-experimental-94c0244ba"
+}
diff --git a/test/integration/cli/experimental-react/package.json b/test/integration/cli/experimental-react/package.json
new file mode 100644
index 0000000000000..be823a58af7d7
--- /dev/null
+++ b/test/integration/cli/experimental-react/package.json
@@ -0,0 +1,6 @@
+{
+  "dependencies": {
+    "react": "*",
+    "react-dom": "*"
+  }
+}
diff --git a/test/integration/cli/experimental-react/pages/index.js b/test/integration/cli/experimental-react/pages/index.js
new file mode 100644
index 0000000000000..8f6a8e1b41548
--- /dev/null
+++ b/test/integration/cli/experimental-react/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <p>Hello</p>
+}
diff --git a/test/integration/cli/test/index.test.js b/test/integration/cli/test/index.test.js
index 0874209398c2a..9dd7a1dcd87d6 100644
--- a/test/integration/cli/test/index.test.js
+++ b/test/integration/cli/test/index.test.js
@@ -16,6 +16,8 @@ jest.setTimeout(1000 * 60 * 5)
 const dir = join(__dirname, '..')
 const dirOldReact = join(__dirname, '../old-react')
 const dirOldReactDom = join(__dirname, '../old-react-dom')
+const dirExperimentalReact = join(__dirname, '../experimental-react')
+const dirExperimentalReactDom = join(__dirname, '../experimental-react-dom')
 
 describe('CLI Usage', () => {
   describe('no command', () => {
@@ -257,6 +259,42 @@ describe('CLI Usage', () => {
 
       await killApp(instance)
     })
+
+    test('experimental react version', async () => {
+      const port = await findPort()
+
+      let stderr = ''
+      let instance = await launchApp(dirExperimentalReact, port, {
+        stderr: true,
+        onStderr(msg) {
+          stderr += msg
+        },
+      })
+
+      expect(stderr).not.toMatch('disabled')
+      expect(stderr).not.toMatch('outdated')
+      expect(stderr).not.toMatch(`react-dom`)
+
+      await killApp(instance)
+    })
+
+    test('experimental react-dom version', async () => {
+      const port = await findPort()
+
+      let stderr = ''
+      let instance = await launchApp(dirExperimentalReactDom, port, {
+        stderr: true,
+        onStderr(msg) {
+          stderr += msg
+        },
+      })
+
+      expect(stderr).not.toMatch('disabled')
+      expect(stderr).not.toMatch('outdated')
+      expect(stderr).not.toMatch('`react`')
+
+      await killApp(instance)
+    })
   })
 
   describe('export', () => {
diff --git a/test/integration/client-404/pages/missing.js b/test/integration/client-404/pages/missing.js
new file mode 100644
index 0000000000000..d234e371bc13d
--- /dev/null
+++ b/test/integration/client-404/pages/missing.js
@@ -0,0 +1,3 @@
+export default function Missing() {
+  return <p id="missing">poof</p>
+}
diff --git a/test/integration/client-404/pages/to-missing-link.js b/test/integration/client-404/pages/to-missing-link.js
new file mode 100644
index 0000000000000..0e6034013edc6
--- /dev/null
+++ b/test/integration/client-404/pages/to-missing-link.js
@@ -0,0 +1,7 @@
+import Link from 'next/link'
+
+export default () => (
+  <Link href="/missing">
+    <a id="to-missing">to 404</a>
+  </Link>
+)
diff --git a/test/integration/client-404/test/client-navigation.js b/test/integration/client-404/test/client-navigation.js
index 060a8a030074f..fbe45ae3b96d7 100644
--- a/test/integration/client-404/test/client-navigation.js
+++ b/test/integration/client-404/test/client-navigation.js
@@ -1,8 +1,8 @@
 /* eslint-env jest */
 import webdriver from 'next-webdriver'
-import { check } from 'next-test-utils'
+import { check, waitFor } from 'next-test-utils'
 
-export default (context) => {
+export default (context, isProd = false) => {
   describe('Client Navigation 404', () => {
     describe('should show 404 upon client replacestate', () => {
       it('should navigate the page', async () => {
@@ -31,5 +31,28 @@ export default (context) => {
       await check(() => browser.elementByCss('#errorStatusCode').text(), /404/)
       expect(await browser.eval(() => window.beforeNav)).not.toBe('hi')
     })
+
+    if (isProd) {
+      it('should hard navigate to URL on failing to load missing bundle', async () => {
+        const browser = await webdriver(context.appPort, '/to-missing-link')
+        await browser.eval(() => (window.beforeNav = 'hi'))
+        expect(
+          await browser.eval(() =>
+            document.querySelector('script[src*="pages/missing"]')
+          )
+        ).toBeFalsy()
+        await browser.elementByCss('#to-missing').moveTo()
+        await waitFor(2000)
+        expect(
+          await browser.eval(() =>
+            document.querySelector('script[src*="pages/missing"]')
+          )
+        ).toBeTruthy()
+        await browser.elementByCss('#to-missing').click()
+        await waitFor(2000)
+        expect(await browser.eval(() => window.beforeNav)).not.toBe('hi')
+        await check(() => browser.elementByCss('#missing').text(), /poof/)
+      })
+    }
   })
 }
diff --git a/test/integration/client-404/test/index.test.js b/test/integration/client-404/test/index.test.js
index 79f41050d679e..ef36961e19759 100644
--- a/test/integration/client-404/test/index.test.js
+++ b/test/integration/client-404/test/index.test.js
@@ -8,7 +8,9 @@ import {
   killApp,
   nextBuild,
   nextStart,
+  getBuildManifest,
 } from 'next-test-utils'
+import fs from 'fs-extra'
 
 // test suite
 import clientNavigation from './client-navigation'
@@ -17,8 +19,8 @@ const context = {}
 const appDir = join(__dirname, '../')
 jest.setTimeout(1000 * 60 * 5)
 
-const runTests = () => {
-  clientNavigation(context, (p, q) => renderViaHTTP(context.appPort, p, q))
+const runTests = (isProd = false) => {
+  clientNavigation(context, isProd)
 }
 
 describe('Client 404', () => {
@@ -40,9 +42,18 @@ describe('Client 404', () => {
       await nextBuild(appDir)
       context.appPort = await findPort()
       context.server = await nextStart(appDir, context.appPort)
+
+      const manifest = await getBuildManifest(appDir)
+      const files = manifest.pages['/missing'].filter((d) =>
+        /static[\\/]chunks[\\/]pages/.test(d)
+      )
+      if (files.length < 1) {
+        throw new Error('oops!')
+      }
+      await Promise.all(files.map((f) => fs.remove(join(appDir, '.next', f))))
     })
     afterAll(() => killApp(context.server))
 
-    runTests()
+    runTests(true)
   })
 })
diff --git a/test/integration/create-next-app/index.test.js b/test/integration/create-next-app/index.test.js
index 3a26af4c26688..63cb6de6a20a5 100644
--- a/test/integration/create-next-app/index.test.js
+++ b/test/integration/create-next-app/index.test.js
@@ -23,9 +23,9 @@ const runStarter = (cwd, ...args) => {
   return res
 }
 
-async function usingTempDir(fn) {
+async function usingTempDir(fn, options) {
   const folder = path.join(os.tmpdir(), Math.random().toString(36).substring(2))
-  await fs.mkdirp(folder)
+  await fs.mkdirp(folder, options)
   try {
     return await fn(folder)
   } finally {
@@ -251,4 +251,28 @@ describe('create next app', () => {
       }
     })
   })
+
+  it('should exit if the folder is not writable', async () => {
+    await usingTempDir(async (cwd) => {
+      const projectName = 'not-writable'
+      expect.assertions(2)
+      try {
+        const res = await runStarter(cwd, projectName)
+
+        if (process.platform === 'win32') {
+          expect(res.exitCode).toBe(0)
+          expect(
+            fs.existsSync(path.join(cwd, projectName, 'package.json'))
+          ).toBeTruthy()
+        }
+      } catch (e) {
+        // eslint-disable-next-line jest/no-try-expect
+        expect(e.exitCode).toBe(1)
+        // eslint-disable-next-line jest/no-try-expect
+        expect(e.stderr).toMatch(
+          /you do not have write permissions for this folder/
+        )
+      }
+    }, 0o500)
+  })
 })
diff --git a/test/integration/css-fixtures/composes-ordering/pages/common.module.css b/test/integration/css-fixtures/composes-ordering/pages/common.module.css
new file mode 100644
index 0000000000000..4a4cbb65c748d
--- /dev/null
+++ b/test/integration/css-fixtures/composes-ordering/pages/common.module.css
@@ -0,0 +1,3 @@
+.colorRed {
+  color: red;
+}
diff --git a/test/integration/css-fixtures/composes-ordering/pages/index.js b/test/integration/css-fixtures/composes-ordering/pages/index.js
new file mode 100644
index 0000000000000..0ded73bed9872
--- /dev/null
+++ b/test/integration/css-fixtures/composes-ordering/pages/index.js
@@ -0,0 +1,16 @@
+import Link from 'next/link'
+import css from './index.module.css'
+
+export default function Home() {
+  return (
+    <main>
+      <Link href="/other">
+        <a id="link-other">other</a>
+      </Link>
+      <br />
+      <h1 id="black-title" className={css.header}>
+        Black
+      </h1>
+    </main>
+  )
+}
diff --git a/test/integration/css-fixtures/composes-ordering/pages/index.module.css b/test/integration/css-fixtures/composes-ordering/pages/index.module.css
new file mode 100644
index 0000000000000..0eea8b0a2e907
--- /dev/null
+++ b/test/integration/css-fixtures/composes-ordering/pages/index.module.css
@@ -0,0 +1,5 @@
+.header {
+  font-size: 25px;
+  composes: colorRed from 'common.module.css';
+  color: #111;
+}
diff --git a/test/integration/css-fixtures/composes-ordering/pages/other.js b/test/integration/css-fixtures/composes-ordering/pages/other.js
new file mode 100644
index 0000000000000..2b3b76459e537
--- /dev/null
+++ b/test/integration/css-fixtures/composes-ordering/pages/other.js
@@ -0,0 +1,16 @@
+import Link from 'next/link'
+import css from './other.module.css'
+
+export default function Other() {
+  return (
+    <main>
+      <Link href="/">
+        <a id="link-index">index page</a>
+      </Link>
+      <br />
+      <h1 id="red-title" className={css.root}>
+        Red
+      </h1>
+    </main>
+  )
+}
diff --git a/test/integration/css-fixtures/composes-ordering/pages/other.module.css b/test/integration/css-fixtures/composes-ordering/pages/other.module.css
new file mode 100644
index 0000000000000..db62f52210d17
--- /dev/null
+++ b/test/integration/css-fixtures/composes-ordering/pages/other.module.css
@@ -0,0 +1,3 @@
+.root {
+  composes: colorRed from './common.module.css';
+}
diff --git a/test/integration/css-fixtures/hydrate-without-deps/pages/common.module.css b/test/integration/css-fixtures/hydrate-without-deps/pages/common.module.css
new file mode 100644
index 0000000000000..4a4cbb65c748d
--- /dev/null
+++ b/test/integration/css-fixtures/hydrate-without-deps/pages/common.module.css
@@ -0,0 +1,3 @@
+.colorRed {
+  color: red;
+}
diff --git a/test/integration/css-fixtures/hydrate-without-deps/pages/index.js b/test/integration/css-fixtures/hydrate-without-deps/pages/index.js
new file mode 100644
index 0000000000000..52d6deddee622
--- /dev/null
+++ b/test/integration/css-fixtures/hydrate-without-deps/pages/index.js
@@ -0,0 +1,17 @@
+import { useEffect, useState } from 'react'
+import css from './index.module.css'
+
+export default function Home() {
+  const [state, setState] = useState('')
+  useEffect(() => {
+    setState('mounted')
+  }, [])
+  return (
+    <main>
+      <h1 id="black-title" className={css.header}>
+        Black
+      </h1>
+      <p>{state}</p>
+    </main>
+  )
+}
diff --git a/test/integration/css-fixtures/hydrate-without-deps/pages/index.module.css b/test/integration/css-fixtures/hydrate-without-deps/pages/index.module.css
new file mode 100644
index 0000000000000..0eea8b0a2e907
--- /dev/null
+++ b/test/integration/css-fixtures/hydrate-without-deps/pages/index.module.css
@@ -0,0 +1,5 @@
+.header {
+  font-size: 25px;
+  composes: colorRed from 'common.module.css';
+  color: #111;
+}
diff --git a/test/integration/css-fixtures/next-issue-12343/components/button.jsx b/test/integration/css-fixtures/next-issue-12343/components/button.jsx
new file mode 100644
index 0000000000000..6d4442b69b1ed
--- /dev/null
+++ b/test/integration/css-fixtures/next-issue-12343/components/button.jsx
@@ -0,0 +1,5 @@
+import styles from './button.module.css'
+
+export const Button = ({ className, ...rest }) => (
+  <a className={`${styles.button} ${className}`} {...rest} />
+)
diff --git a/test/integration/css-fixtures/next-issue-12343/components/button.module.css b/test/integration/css-fixtures/next-issue-12343/components/button.module.css
new file mode 100644
index 0000000000000..dcffeaaf4b3f1
--- /dev/null
+++ b/test/integration/css-fixtures/next-issue-12343/components/button.module.css
@@ -0,0 +1,3 @@
+.button {
+  background: hotpink;
+}
diff --git a/test/integration/css-fixtures/next-issue-12343/pages/another-page.js b/test/integration/css-fixtures/next-issue-12343/pages/another-page.js
new file mode 100644
index 0000000000000..7b40a60c4bac4
--- /dev/null
+++ b/test/integration/css-fixtures/next-issue-12343/pages/another-page.js
@@ -0,0 +1,15 @@
+import { Button } from '../components/button'
+import Link from 'next/link'
+
+function AnotherPage() {
+  return (
+    <div>
+      <h1>Another page</h1>
+      <Link href="/">
+        <Button id="link-index">Another Button instance</Button>
+      </Link>
+    </div>
+  )
+}
+
+export default AnotherPage
diff --git a/test/integration/css-fixtures/next-issue-12343/pages/homepage.module.css b/test/integration/css-fixtures/next-issue-12343/pages/homepage.module.css
new file mode 100644
index 0000000000000..1dfa11f18bec8
--- /dev/null
+++ b/test/integration/css-fixtures/next-issue-12343/pages/homepage.module.css
@@ -0,0 +1,3 @@
+.button {
+  background: lime;
+}
diff --git a/test/integration/css-fixtures/next-issue-12343/pages/index.js b/test/integration/css-fixtures/next-issue-12343/pages/index.js
new file mode 100644
index 0000000000000..0844001c4e41a
--- /dev/null
+++ b/test/integration/css-fixtures/next-issue-12343/pages/index.js
@@ -0,0 +1,18 @@
+import Link from 'next/link'
+import { Button } from '../components/button'
+import styles from './homepage.module.css'
+
+function HomePage() {
+  return (
+    <div>
+      <h1>Home page</h1>
+      <Link href="/another-page">
+        <Button id="link-other" className={styles.button}>
+          Another page
+        </Button>
+      </Link>
+    </div>
+  )
+}
+
+export default HomePage
diff --git a/test/integration/css-fixtures/transition-cleanup/pages/common.module.css b/test/integration/css-fixtures/transition-cleanup/pages/common.module.css
new file mode 100644
index 0000000000000..4a4cbb65c748d
--- /dev/null
+++ b/test/integration/css-fixtures/transition-cleanup/pages/common.module.css
@@ -0,0 +1,3 @@
+.colorRed {
+  color: red;
+}
diff --git a/test/integration/css-fixtures/transition-cleanup/pages/index.js b/test/integration/css-fixtures/transition-cleanup/pages/index.js
new file mode 100644
index 0000000000000..2c1b84ba31080
--- /dev/null
+++ b/test/integration/css-fixtures/transition-cleanup/pages/index.js
@@ -0,0 +1,20 @@
+import Link from 'next/link'
+import css from './index.module.css'
+
+export default function Home() {
+  return (
+    <main>
+      <Link href="/other">
+        <a id="link-other">other</a>
+      </Link>
+      <br />
+      <h1 id="black-title" className={css.header}>
+        Black
+      </h1>
+    </main>
+  )
+}
+
+export function getServerSideProps() {
+  return { props: {} }
+}
diff --git a/test/integration/css-fixtures/transition-cleanup/pages/index.module.css b/test/integration/css-fixtures/transition-cleanup/pages/index.module.css
new file mode 100644
index 0000000000000..0eea8b0a2e907
--- /dev/null
+++ b/test/integration/css-fixtures/transition-cleanup/pages/index.module.css
@@ -0,0 +1,5 @@
+.header {
+  font-size: 25px;
+  composes: colorRed from 'common.module.css';
+  color: #111;
+}
diff --git a/test/integration/css-fixtures/transition-cleanup/pages/other.js b/test/integration/css-fixtures/transition-cleanup/pages/other.js
new file mode 100644
index 0000000000000..2362bda8c0cbd
--- /dev/null
+++ b/test/integration/css-fixtures/transition-cleanup/pages/other.js
@@ -0,0 +1,9 @@
+import css from './other.module.css'
+
+export default function Other() {
+  throw new Error(`oops ${css.root}`)
+}
+
+export function getServerSideProps() {
+  return { props: {} }
+}
diff --git a/test/integration/css-fixtures/transition-cleanup/pages/other.module.css b/test/integration/css-fixtures/transition-cleanup/pages/other.module.css
new file mode 100644
index 0000000000000..db62f52210d17
--- /dev/null
+++ b/test/integration/css-fixtures/transition-cleanup/pages/other.module.css
@@ -0,0 +1,3 @@
+.root {
+  composes: colorRed from './common.module.css';
+}
diff --git a/test/integration/css-fixtures/transition-reload/pages/common.module.css b/test/integration/css-fixtures/transition-reload/pages/common.module.css
new file mode 100644
index 0000000000000..4a4cbb65c748d
--- /dev/null
+++ b/test/integration/css-fixtures/transition-reload/pages/common.module.css
@@ -0,0 +1,3 @@
+.colorRed {
+  color: red;
+}
diff --git a/test/integration/css-fixtures/transition-reload/pages/index.js b/test/integration/css-fixtures/transition-reload/pages/index.js
new file mode 100644
index 0000000000000..dd97041a332c8
--- /dev/null
+++ b/test/integration/css-fixtures/transition-reload/pages/index.js
@@ -0,0 +1,16 @@
+import Link from 'next/link'
+import css from './index.module.css'
+
+export default function Home() {
+  return (
+    <main>
+      <Link href="/other" prefetch={false}>
+        <a id="link-other">other</a>
+      </Link>
+      <br />
+      <h1 id="black-title" className={css.header}>
+        Black
+      </h1>
+    </main>
+  )
+}
diff --git a/test/integration/css-fixtures/transition-reload/pages/index.module.css b/test/integration/css-fixtures/transition-reload/pages/index.module.css
new file mode 100644
index 0000000000000..0eea8b0a2e907
--- /dev/null
+++ b/test/integration/css-fixtures/transition-reload/pages/index.module.css
@@ -0,0 +1,5 @@
+.header {
+  font-size: 25px;
+  composes: colorRed from 'common.module.css';
+  color: #111;
+}
diff --git a/test/integration/css-fixtures/transition-reload/pages/other.js b/test/integration/css-fixtures/transition-reload/pages/other.js
new file mode 100644
index 0000000000000..ec594ee73f32f
--- /dev/null
+++ b/test/integration/css-fixtures/transition-reload/pages/other.js
@@ -0,0 +1,16 @@
+import Link from 'next/link'
+import css from './other.module.css'
+
+export default function Other() {
+  return (
+    <main>
+      <Link href="/" prefetch={false}>
+        <a id="link-index">index page</a>
+      </Link>
+      <br />
+      <h1 id="red-title" className={css.root}>
+        Red
+      </h1>
+    </main>
+  )
+}
diff --git a/test/integration/css-fixtures/transition-reload/pages/other.module.css b/test/integration/css-fixtures/transition-reload/pages/other.module.css
new file mode 100644
index 0000000000000..db62f52210d17
--- /dev/null
+++ b/test/integration/css-fixtures/transition-reload/pages/other.module.css
@@ -0,0 +1,3 @@
+.root {
+  composes: colorRed from './common.module.css';
+}
diff --git a/test/integration/css/test/index.test.js b/test/integration/css/test/index.test.js
index 7f212fb47a3bf..a84ec9bf3fbdd 100644
--- a/test/integration/css/test/index.test.js
+++ b/test/integration/css/test/index.test.js
@@ -1,7 +1,7 @@
 /* eslint-env jest */
 import cheerio from 'cheerio'
 import 'flat-map-polyfill'
-import { readdir, readFile, remove } from 'fs-extra'
+import { pathExists, readdir, readFile, readJSON, remove } from 'fs-extra'
 import {
   check,
   File,
@@ -1051,4 +1051,442 @@ describe('CSS Support', () => {
       expect(cssMapFiles.length).toBe(1)
     })
   })
+
+  // https://github.com/vercel/next.js/issues/12445
+  describe('CSS Modules Composes Ordering', () => {
+    const appDir = join(fixturesDir, 'composes-ordering')
+    let app, appPort
+
+    function tests(isDev = false) {
+      async function checkBlackTitle(browser) {
+        await browser.waitForElementByCss('#black-title')
+        const titleColor = await browser.eval(
+          `window.getComputedStyle(document.querySelector('#black-title')).color`
+        )
+        expect(titleColor).toBe('rgb(17, 17, 17)')
+      }
+      async function checkRedTitle(browser) {
+        await browser.waitForElementByCss('#red-title')
+        const titleColor = await browser.eval(
+          `window.getComputedStyle(document.querySelector('#red-title')).color`
+        )
+        expect(titleColor).toBe('rgb(255, 0, 0)')
+      }
+      async function checkCssPreloadCount(browser) {
+        return Number(
+          await browser.eval(
+            ` [].slice.call(document.querySelectorAll('link[rel=preload][href$="css"]')).length`
+          )
+        )
+      }
+
+      it('should have correct color on index page (on load)', async () => {
+        const browser = await webdriver(appPort, '/')
+        try {
+          await checkBlackTitle(browser)
+        } finally {
+          await browser.close()
+        }
+      })
+
+      it('should have correct color on index page (on hover)', async () => {
+        const browser = await webdriver(appPort, '/')
+        try {
+          await checkBlackTitle(browser)
+          await browser.waitForElementByCss('#link-other').moveTo()
+          await waitFor(2000)
+          await checkBlackTitle(browser)
+        } finally {
+          await browser.close()
+        }
+      })
+
+      if (!isDev) {
+        it('should preload CSS on hover', async () => {
+          const browser = await webdriver(appPort, '/')
+          try {
+            await checkBlackTitle(browser)
+            expect(await checkCssPreloadCount(browser)).toBe(1)
+            await browser.waitForElementByCss('#link-other').moveTo()
+            await waitFor(2000)
+            expect(await checkCssPreloadCount(browser)).toBe(2)
+          } finally {
+            await browser.close()
+          }
+        })
+
+        it('should have correct CSS injection order', async () => {
+          const browser = await webdriver(appPort, '/')
+          try {
+            await checkBlackTitle(browser)
+
+            const prevSiblingHref = await browser.eval(
+              `document.querySelector('link[rel=stylesheet][data-n-p]').previousSibling.getAttribute('href')`
+            )
+            const currentPageHref = await browser.eval(
+              `document.querySelector('link[rel=stylesheet][data-n-p]').getAttribute('href')`
+            )
+            expect(prevSiblingHref).toBeDefined()
+            expect(prevSiblingHref).toBe(currentPageHref)
+
+            // Navigate to other:
+            await browser.waitForElementByCss('#link-other').click()
+            await checkRedTitle(browser)
+
+            const newPrevSiblingHref = await browser.eval(
+              `document.querySelector('link[rel=stylesheet][data-n-p]').previousSibling.getAttribute('href')`
+            )
+            const newPageHref = await browser.eval(
+              `document.querySelector('link[rel=stylesheet][data-n-p]').getAttribute('href')`
+            )
+            expect(newPageHref).toBeDefined()
+            expect(newPrevSiblingHref).toBe(prevSiblingHref)
+            expect(newPageHref).not.toBe(currentPageHref)
+          } finally {
+            await browser.close()
+          }
+        })
+      }
+
+      it('should have correct color on index page (on nav from index)', async () => {
+        const browser = await webdriver(appPort, '/')
+        try {
+          await checkBlackTitle(browser)
+          await browser.waitForElementByCss('#link-other').click()
+
+          // Wait for navigation:
+          await browser.waitForElementByCss('#link-index')
+          await checkRedTitle(browser)
+
+          // Navigate back to index:
+          await browser.waitForElementByCss('#link-index').click()
+          await checkBlackTitle(browser)
+        } finally {
+          await browser.close()
+        }
+      })
+
+      it('should have correct color on index page (on nav from other)', async () => {
+        const browser = await webdriver(appPort, '/other')
+        try {
+          await checkRedTitle(browser)
+          await browser.waitForElementByCss('#link-index').click()
+
+          // Wait for navigation:
+          await browser.waitForElementByCss('#link-other')
+          await checkBlackTitle(browser)
+
+          // Navigate back to other:
+          await browser.waitForElementByCss('#link-other').click()
+          await checkRedTitle(browser)
+        } finally {
+          await browser.close()
+        }
+      })
+    }
+
+    describe('Development Mode', () => {
+      beforeAll(async () => {
+        await remove(join(appDir, '.next'))
+      })
+      beforeAll(async () => {
+        appPort = await findPort()
+        app = await launchApp(appDir, appPort)
+      })
+      afterAll(async () => {
+        await killApp(app)
+      })
+
+      tests(true)
+    })
+
+    describe('Production Mode', () => {
+      beforeAll(async () => {
+        await remove(join(appDir, '.next'))
+      })
+      beforeAll(async () => {
+        await nextBuild(appDir, [], {})
+        appPort = await findPort()
+        app = await nextStart(appDir, appPort)
+      })
+      afterAll(async () => {
+        await killApp(app)
+      })
+
+      tests()
+    })
+  })
+
+  describe('CSS Cleanup on Render Failure', () => {
+    const appDir = join(fixturesDir, 'transition-cleanup')
+    let app, appPort
+
+    function tests() {
+      async function checkBlackTitle(browser) {
+        await browser.waitForElementByCss('#black-title')
+        const titleColor = await browser.eval(
+          `window.getComputedStyle(document.querySelector('#black-title')).color`
+        )
+        expect(titleColor).toBe('rgb(17, 17, 17)')
+      }
+
+      it('not have intermediary page styles on error rendering', async () => {
+        const browser = await webdriver(appPort, '/')
+        try {
+          await checkBlackTitle(browser)
+
+          const currentPageStyles = await browser.eval(
+            `document.querySelector('link[rel=stylesheet][data-n-p]')`
+          )
+          expect(currentPageStyles).toBeDefined()
+
+          // Navigate to other:
+          await browser.waitForElementByCss('#link-other').click()
+          await check(
+            () => browser.eval(`document.body.innerText`),
+            'An unexpected error has occurred.',
+            true
+          )
+
+          const newPageStyles = await browser.eval(
+            `document.querySelector('link[rel=stylesheet][data-n-p]')`
+          )
+          expect(newPageStyles).toBeFalsy()
+
+          const allPageStyles = await browser.eval(
+            `document.querySelector('link[rel=stylesheet]')`
+          )
+          expect(allPageStyles).toBeFalsy()
+        } finally {
+          await browser.close()
+        }
+      })
+    }
+
+    describe('Production Mode', () => {
+      beforeAll(async () => {
+        await remove(join(appDir, '.next'))
+      })
+      beforeAll(async () => {
+        await nextBuild(appDir, [], {})
+        appPort = await findPort()
+        app = await nextStart(appDir, appPort)
+      })
+      afterAll(async () => {
+        await killApp(app)
+      })
+
+      tests()
+    })
+  })
+
+  describe('Page reload on CSS missing', () => {
+    const appDir = join(fixturesDir, 'transition-reload')
+    let app, appPort
+
+    function tests() {
+      async function checkBlackTitle(browser) {
+        await browser.waitForElementByCss('#black-title')
+        const titleColor = await browser.eval(
+          `window.getComputedStyle(document.querySelector('#black-title')).color`
+        )
+        expect(titleColor).toBe('rgb(17, 17, 17)')
+      }
+
+      it('should fall back to server-side transition on missing CSS', async () => {
+        const browser = await webdriver(appPort, '/')
+        try {
+          await checkBlackTitle(browser)
+          await browser.eval(`window.__priorNavigatePageState = 'OOF';`)
+
+          // Navigate to other:
+          await browser.waitForElementByCss('#link-other').click()
+          // Wait for navigation:
+          await browser.waitForElementByCss('#link-index')
+
+          const state = await browser.eval(`window.__priorNavigatePageState`)
+          expect(state).toBeFalsy()
+        } finally {
+          await browser.close()
+        }
+      })
+    }
+
+    describe('Production Mode', () => {
+      beforeAll(async () => {
+        await remove(join(appDir, '.next'))
+      })
+      beforeAll(async () => {
+        await nextBuild(appDir, [], {})
+        appPort = await findPort()
+        app = await nextStart(appDir, appPort)
+
+        // Remove other page CSS files:
+        const manifest = await readJSON(
+          join(appDir, '.next', 'build-manifest.json')
+        )
+        const files = manifest['pages']['/other'].filter((e) =>
+          e.endsWith('.css')
+        )
+        if (files.length < 1) throw new Error()
+        await Promise.all(files.map((f) => remove(join(appDir, '.next', f))))
+      })
+      afterAll(async () => {
+        await killApp(app)
+      })
+
+      tests()
+    })
+  })
+
+  describe('Page hydrates with CSS and not waiting on dependencies', () => {
+    const appDir = join(fixturesDir, 'hydrate-without-deps')
+    let app, appPort
+
+    function tests() {
+      async function checkBlackTitle(browser) {
+        await browser.waitForElementByCss('#black-title')
+        const titleColor = await browser.eval(
+          `window.getComputedStyle(document.querySelector('#black-title')).color`
+        )
+        expect(titleColor).toBe('rgb(17, 17, 17)')
+      }
+
+      it('should hydrate without dependencies function', async () => {
+        const browser = await webdriver(appPort, '/')
+        try {
+          await checkBlackTitle(browser)
+          await check(
+            () => browser.eval(`document.querySelector('p').innerText`),
+            'mounted'
+          )
+        } finally {
+          await browser.close()
+        }
+      })
+    }
+
+    describe('Production Mode', () => {
+      beforeAll(async () => {
+        await remove(join(appDir, '.next'))
+      })
+      beforeAll(async () => {
+        await nextBuild(appDir, [], {})
+        appPort = await findPort()
+        app = await nextStart(appDir, appPort)
+
+        const buildId = (
+          await readFile(join(appDir, '.next', 'BUILD_ID'), 'utf8')
+        ).trim()
+        const fileName = join(
+          appDir,
+          '.next/static/',
+          buildId,
+          '_buildManifest.js'
+        )
+        if (!(await pathExists(fileName))) {
+          throw new Error('Missing build manifest')
+        }
+        await remove(fileName)
+      })
+      afterAll(async () => {
+        await killApp(app)
+      })
+
+      tests()
+    })
+  })
+
+  // https://github.com/vercel/next.js/issues/12343
+  describe('Basic CSS Modules Ordering', () => {
+    const appDir = join(fixturesDir, 'next-issue-12343')
+    let app, appPort
+
+    function tests() {
+      async function checkGreenButton(browser) {
+        await browser.waitForElementByCss('#link-other')
+        const titleColor = await browser.eval(
+          `window.getComputedStyle(document.querySelector('#link-other')).backgroundColor`
+        )
+        expect(titleColor).toBe('rgb(0, 255, 0)')
+      }
+      async function checkPinkButton(browser) {
+        await browser.waitForElementByCss('#link-index')
+        const titleColor = await browser.eval(
+          `window.getComputedStyle(document.querySelector('#link-index')).backgroundColor`
+        )
+        expect(titleColor).toBe('rgb(255, 105, 180)')
+      }
+
+      it('should have correct color on index page (on load)', async () => {
+        const browser = await webdriver(appPort, '/')
+        try {
+          await checkGreenButton(browser)
+        } finally {
+          await browser.close()
+        }
+      })
+
+      it('should have correct color on index page (on hover)', async () => {
+        const browser = await webdriver(appPort, '/')
+        try {
+          await checkGreenButton(browser)
+          await browser.waitForElementByCss('#link-other').moveTo()
+          await waitFor(2000)
+          await checkGreenButton(browser)
+        } finally {
+          await browser.close()
+        }
+      })
+
+      it('should have correct color on index page (on nav)', async () => {
+        const browser = await webdriver(appPort, '/')
+        try {
+          await checkGreenButton(browser)
+          await browser.waitForElementByCss('#link-other').click()
+
+          // Wait for navigation:
+          await browser.waitForElementByCss('#link-index')
+          await checkPinkButton(browser)
+
+          // Navigate back to index:
+          await browser.waitForElementByCss('#link-index').click()
+          await checkGreenButton(browser)
+        } finally {
+          await browser.close()
+        }
+      })
+    }
+
+    describe('Development Mode', () => {
+      beforeAll(async () => {
+        await remove(join(appDir, '.next'))
+      })
+      beforeAll(async () => {
+        appPort = await findPort()
+        app = await launchApp(appDir, appPort)
+      })
+      afterAll(async () => {
+        await killApp(app)
+      })
+
+      tests()
+    })
+
+    describe('Production Mode', () => {
+      beforeAll(async () => {
+        await remove(join(appDir, '.next'))
+      })
+      beforeAll(async () => {
+        await nextBuild(appDir, [], {})
+        appPort = await findPort()
+        app = await nextStart(appDir, appPort)
+      })
+      afterAll(async () => {
+        await killApp(app)
+      })
+
+      tests()
+    })
+  })
 })
diff --git a/test/integration/custom-routes/next.config.js b/test/integration/custom-routes/next.config.js
index 28fdf2234d2be..bcf6fd4886e17 100644
--- a/test/integration/custom-routes/next.config.js
+++ b/test/integration/custom-routes/next.config.js
@@ -10,6 +10,10 @@ module.exports = {
             },
           ]
         : []),
+      {
+        source: '/rewriting-to-auto-export',
+        destination: '/auto-export/hello',
+      },
       {
         source: '/to-another',
         destination: '/another/one',
diff --git a/test/integration/custom-routes/test/index.test.js b/test/integration/custom-routes/test/index.test.js
index e229f8c3bc4e8..d3acb92fa4d41 100644
--- a/test/integration/custom-routes/test/index.test.js
+++ b/test/integration/custom-routes/test/index.test.js
@@ -36,6 +36,12 @@ let appPort
 let app
 
 const runTests = (isDev = false) => {
+  it('should parse params correctly for rewrite to auto-export dynamic page', async () => {
+    const browser = await webdriver(appPort, '/rewriting-to-auto-export')
+    const text = await browser.eval(() => document.documentElement.innerHTML)
+    expect(text).toContain('auto-export hello')
+  })
+
   it('should handle one-to-one rewrite successfully', async () => {
     const html = await renderViaHTTP(appPort, '/first')
     expect(html).toMatch(/hello/)
@@ -167,6 +173,12 @@ const runTests = (isDev = false) => {
     expect(html).toMatch(/Hello/)
   })
 
+  it('should not append params when one is used in destination path', async () => {
+    const html = await renderViaHTTP(appPort, '/test/with-params?a=b')
+    const $ = cheerio.load(html)
+    expect(JSON.parse($('p').text())).toEqual({ a: 'b' })
+  })
+
   it('should double redirect successfully', async () => {
     const html = await renderViaHTTP(appPort, '/docs/github')
     expect(html).toMatch(/hi there/)
@@ -391,7 +403,6 @@ const runTests = (isDev = false) => {
       {
         pathname: '/first',
         query: {
-          path: 'first',
           keep: 'me',
           and: 'me',
         },
@@ -512,6 +523,7 @@ const runTests = (isDev = false) => {
         version: 3,
         pages404: true,
         basePath: '',
+        dataRoutes: [],
         redirects: [
           {
             destination: '/:path+',
@@ -804,6 +816,11 @@ const runTests = (isDev = false) => {
           },
         ],
         rewrites: [
+          {
+            destination: '/auto-export/hello',
+            regex: normalizeRegEx('^\\/rewriting-to-auto-export$'),
+            source: '/rewriting-to-auto-export',
+          },
           {
             destination: '/another/one',
             regex: normalizeRegEx('^\\/to-another$'),
@@ -996,13 +1013,6 @@ const runTests = (isDev = false) => {
         }
       }
     })
-  } else {
-    it('should show error for dynamic auto export rewrite', async () => {
-      const html = await renderViaHTTP(appPort, '/to-another')
-      expect(html).toContain(
-        `Rewrites don't support auto-exported dynamic pages yet`
-      )
-    })
   }
 }
 
@@ -1033,6 +1043,16 @@ describe('Custom routes', () => {
     await fs.writeFile(nextConfigPath, nextConfigRestoreContent)
   })
 
+  describe('dev mode', () => {
+    beforeAll(async () => {
+      appPort = await findPort()
+      app = await launchApp(appDir, appPort)
+      buildId = 'development'
+    })
+    afterAll(() => killApp(app))
+    runTests(true)
+  })
+
   describe('no-op rewrite', () => {
     beforeAll(async () => {
       appPort = await findPort()
@@ -1044,26 +1064,13 @@ describe('Custom routes', () => {
     })
     afterAll(() => killApp(app))
 
-    it('should not show error for no-op rewrite and auto export dynamic route', async () => {
+    it('should not error for no-op rewrite and auto export dynamic route', async () => {
       const browser = await webdriver(appPort, '/auto-export/my-slug')
       const html = await browser.eval(() => document.documentElement.innerHTML)
-      expect(html).not.toContain(
-        `Rewrites don't support auto-exported dynamic pages yet`
-      )
       expect(html).toContain(`auto-export my-slug`)
     })
   })
 
-  describe('dev mode', () => {
-    beforeAll(async () => {
-      appPort = await findPort()
-      app = await launchApp(appDir, appPort)
-      buildId = 'development'
-    })
-    afterAll(() => killApp(app))
-    runTests(true)
-  })
-
   describe('server mode', () => {
     beforeAll(async () => {
       const { stdout: buildStdout } = await nextBuild(appDir, [], {
@@ -1162,7 +1169,6 @@ describe('Custom routes', () => {
       expect(data).toEqual({
         query: {
           slug: 'first',
-          name: 'first',
           hello: 'first',
         },
       })
diff --git a/test/integration/dynamic-routing/pages/index.js b/test/integration/dynamic-routing/pages/index.js
index c0a3df33d796d..2fbc0578c76fe 100644
--- a/test/integration/dynamic-routing/pages/index.js
+++ b/test/integration/dynamic-routing/pages/index.js
@@ -9,6 +9,10 @@ const Page = () => {
         <a id="view-post-1">View post 1</a>
       </Link>
       <br />
+      <Link href="/post-1">
+        <a id="view-post-1-no-as">View post 1</a>
+      </Link>
+      <br />
       <Link href="/[name]/comments" as="/post-1/comments">
         <a id="view-post-1-comments">View post 1 comments</a>
       </Link>
@@ -17,6 +21,14 @@ const Page = () => {
         <a id="view-post-1-comment-1">View comment 1 on post 1</a>
       </Link>
       <br />
+      <Link href="/post-1/comment-1">
+        <a id="view-post-1-comment-1-no-as">View comment 1 on post 1</a>
+      </Link>
+      <br />
+      <Link href="/added-later/first">
+        <a id="added-later-link">/added-later/first</a>
+      </Link>
+      <br />
       <Link href="/blog/[post]/comment/[id]" as="/blog/321/comment/123">
         <a id="view-nested-dynamic-cmnt">View comment 123 on blog post 321</a>
       </Link>
@@ -49,6 +61,9 @@ const Page = () => {
       <Link href="/p1/p2/all-ssg/[...rest]" as="/p1/p2/all-ssg/hello1/hello2">
         <a id="ssg-catch-all-multi">Catch-all route (multi)</a>
       </Link>
+      <Link href="/p1/p2/all-ssg/hello1/hello2">
+        <a id="ssg-catch-all-multi-no-as">Catch-all route (multi)</a>
+      </Link>
       <Link
         href="/p1/p2/nested-all-ssg/[...rest]"
         as="/p1/p2/nested-all-ssg/hello"
diff --git a/test/integration/dynamic-routing/test/index.test.js b/test/integration/dynamic-routing/test/index.test.js
index 7e22b5f119e32..5537f59208516 100644
--- a/test/integration/dynamic-routing/test/index.test.js
+++ b/test/integration/dynamic-routing/test/index.test.js
@@ -1,7 +1,7 @@
 /* eslint-env jest */
 
 import webdriver from 'next-webdriver'
-import { join } from 'path'
+import { join, dirname } from 'path'
 import fs from 'fs-extra'
 import {
   renderViaHTTP,
@@ -13,6 +13,7 @@ import {
   nextBuild,
   nextStart,
   normalizeRegEx,
+  check,
 } from 'next-test-utils'
 import cheerio from 'cheerio'
 import escapeRegex from 'escape-string-regexp'
@@ -86,9 +87,29 @@ function runTests(dev) {
     let browser
     try {
       browser = await webdriver(appPort, '/')
+      await browser.eval('window.beforeNav = 1')
       await browser.elementByCss('#view-post-1').click()
       await browser.waitForElementByCss('#asdf')
 
+      expect(await browser.eval('window.beforeNav')).toBe(1)
+
+      const text = await browser.elementByCss('#asdf').text()
+      expect(text).toMatch(/this is.*?post-1/i)
+    } finally {
+      if (browser) await browser.close()
+    }
+  })
+
+  it('should navigate to a dynamic page successfully no as', async () => {
+    let browser
+    try {
+      browser = await webdriver(appPort, '/')
+      await browser.eval('window.beforeNav = 1')
+      await browser.elementByCss('#view-post-1-no-as').click()
+      await browser.waitForElementByCss('#asdf')
+
+      expect(await browser.eval('window.beforeNav')).toBe(1)
+
       const text = await browser.elementByCss('#asdf').text()
       expect(text).toMatch(/this is.*?post-1/i)
     } finally {
@@ -137,9 +158,29 @@ function runTests(dev) {
     let browser
     try {
       browser = await webdriver(appPort, '/')
+      await browser.eval('window.beforeNav = 1')
       await browser.elementByCss('#view-post-1-comment-1').click()
       await browser.waitForElementByCss('#asdf')
 
+      expect(await browser.eval('window.beforeNav')).toBe(1)
+
+      const text = await browser.elementByCss('#asdf').text()
+      expect(text).toMatch(/i am.*comment-1.*on.*post-1/i)
+    } finally {
+      if (browser) await browser.close()
+    }
+  })
+
+  it('should navigate to a nested dynamic page successfully no as', async () => {
+    let browser
+    try {
+      browser = await webdriver(appPort, '/')
+      await browser.eval('window.beforeNav = 1')
+      await browser.elementByCss('#view-post-1-comment-1-no-as').click()
+      await browser.waitForElementByCss('#asdf')
+
+      expect(await browser.eval('window.beforeNav')).toBe(1)
+
       const text = await browser.elementByCss('#asdf').text()
       expect(text).toMatch(/i am.*comment-1.*on.*post-1/i)
     } finally {
@@ -354,9 +395,29 @@ function runTests(dev) {
     let browser
     try {
       browser = await webdriver(appPort, '/')
+      await browser.eval('window.beforeNav = 1')
       await browser.elementByCss('#ssg-catch-all-multi').click()
       await browser.waitForElementByCss('#all-ssg-content')
 
+      expect(await browser.eval('window.beforeNav')).toBe(1)
+
+      const text = await browser.elementByCss('#all-ssg-content').text()
+      expect(text).toBe('{"rest":["hello1","hello2"]}')
+    } finally {
+      if (browser) await browser.close()
+    }
+  })
+
+  it('[ssg: catch-all] should pass params in getStaticProps during client navigation (multi) no as', async () => {
+    let browser
+    try {
+      browser = await webdriver(appPort, '/')
+      await browser.eval('window.beforeNav = 1')
+      await browser.elementByCss('#ssg-catch-all-multi-no-as').click()
+      await browser.waitForElementByCss('#all-ssg-content')
+
+      expect(await browser.eval('window.beforeNav')).toBe(1)
+
       const text = await browser.elementByCss('#all-ssg-content').text()
       expect(text).toBe('{"rest":["hello1","hello2"]}')
     } finally {
@@ -500,7 +561,74 @@ function runTests(dev) {
     expect(res.status).toBe(400)
   })
 
+  it('should preload buildManifest for auto-export dynamic pages', async () => {
+    const html = await renderViaHTTP(appPort, '/on-mount/hello')
+    const $ = cheerio.load(html)
+    let found = 0
+
+    for (const el of Array.from($('link[rel="preload"]'))) {
+      const { href } = el.attribs
+      if (
+        href.includes('_buildManifest.js') ||
+        href.includes('_buildManifest.module.js')
+      ) {
+        found++
+      }
+    }
+    expect(found).toBe(dev ? 2 : 1)
+  })
+
+  it('should not preload buildManifest for non-auto export dynamic pages', async () => {
+    const html = await renderViaHTTP(appPort, '/hello')
+    const $ = cheerio.load(html)
+    let found = 0
+
+    for (const el of Array.from($('link[rel="preload"]'))) {
+      const { href } = el.attribs
+      if (
+        href.includes('_buildManifest.js') ||
+        href.includes('_buildManifest.module.js')
+      ) {
+        found++
+      }
+    }
+    expect(found).toBe(0)
+  })
+
   if (dev) {
+    it('should resolve dynamic route href for page added later', async () => {
+      const browser = await webdriver(appPort, '/')
+      const addLaterPage = join(appDir, 'pages/added-later/[slug].js')
+
+      await fs.mkdir(dirname(addLaterPage)).catch(() => {})
+      await fs.writeFile(
+        addLaterPage,
+        `
+        import { useRouter } from 'next/router'
+
+        export default function Page() {
+          return <p id='added-later'>slug: {useRouter().query.slug}</p>
+        }
+      `
+      )
+
+      await check(async () => {
+        const contents = await renderViaHTTP(
+          appPort,
+          '/_next/static/development/_devPagesManifest.json'
+        )
+        return contents.includes('added-later') ? 'success' : 'fail'
+      }, 'success')
+
+      await browser.elementByCss('#added-later-link').click()
+      await browser.waitForElementByCss('#added-later')
+
+      const text = await browser.elementByCss('#added-later').text()
+
+      await fs.remove(dirname(addLaterPage))
+      expect(text).toBe('slug: first')
+    })
+
     it('should work with HMR correctly', async () => {
       const browser = await webdriver(appPort, '/post-1/comments')
       let text = await browser.eval(`document.documentElement.innerHTML`)
diff --git a/test/integration/image-optimization/test/index.test.js b/test/integration/image-optimization/test/index.test.js
index f2da1b5e47eab..efa9cacb45b87 100644
--- a/test/integration/image-optimization/test/index.test.js
+++ b/test/integration/image-optimization/test/index.test.js
@@ -30,31 +30,37 @@ function runTests() {
 function checkImagesOnPage(path) {
   it('should not preload tiny images', async () => {
     const html = await renderViaHTTP(appPort, path)
-    expect(html).not.toContain('<link rel="preload" href="tiny-image.jpg"/>')
+    expect(html).not.toContain(
+      '<link rel="preload" href="tiny-image.jpg" as="image"/>'
+    )
   })
   it('should not add a preload if one already exists', async () => {
     let html = await renderViaHTTP(appPort, path)
     html = html.replace(
-      '<link rel="preload" href="already-preloaded.jpg"/>',
+      '<link rel="preload" href="already-preloaded.jpg" as="image"/>',
       ''
     )
     expect(html).not.toContain(
-      '<link rel="preload" href="already-preloaded.jpg"/>'
+      '<link rel="preload" href="already-preloaded.jpg" as="image"/>'
     )
   })
   it('should not preload hidden images', async () => {
     const html = await renderViaHTTP(appPort, path)
     expect(html).not.toContain(
-      '<link rel="preload" href="hidden-image-1.jpg"/>'
+      '<link rel="preload" href="hidden-image-1.jpg" as="image"/>'
     )
     expect(html).not.toContain(
-      '<link rel="preload" href="hidden-image-2.jpg"/>'
+      '<link rel="preload" href="hidden-image-2.jpg" as="image"/>'
     )
   })
   it('should preload exactly two eligible images', async () => {
     const html = await renderViaHTTP(appPort, path)
-    expect(html).toContain('<link rel="preload" href="main-image-1.jpg"/>')
-    expect(html).not.toContain('<link rel="preload" href="main-image-2.jpg"/>')
+    expect(html).toContain(
+      '<link rel="preload" href="main-image-1.jpg" as="image"/>'
+    )
+    expect(html).not.toContain(
+      '<link rel="preload" href="main-image-2.jpg" as="image"/>'
+    )
   })
 }
 
diff --git a/test/integration/page-config/pages/invalid/export-from.js b/test/integration/page-config/pages/invalid/export-from.js
new file mode 100644
index 0000000000000..ddb258d6cdc85
--- /dev/null
+++ b/test/integration/page-config/pages/invalid/export-from.js
@@ -0,0 +1,3 @@
+// export { config } from '../../config'
+
+export default () => <p>hello world</p>
diff --git a/test/integration/page-config/pages/invalid/import-export.js b/test/integration/page-config/pages/invalid/import-export.js
new file mode 100644
index 0000000000000..919272bb8621d
--- /dev/null
+++ b/test/integration/page-config/pages/invalid/import-export.js
@@ -0,0 +1,6 @@
+// eslint-disable-next-line no-unused-vars
+import { config } from '../../config'
+
+// export { config }
+
+export default () => <p>hello world</p>
diff --git a/test/integration/page-config/pages/invalid/spread-config.js b/test/integration/page-config/pages/invalid/spread-config.js
index 93e2e73dda7cf..a85262c17e806 100644
--- a/test/integration/page-config/pages/invalid/spread-config.js
+++ b/test/integration/page-config/pages/invalid/spread-config.js
@@ -2,4 +2,4 @@ const props = { amp: true }
 
 // export const config = { ...props }
 
-export default () => <p>{props}</p>
+export default () => <p>{JSON.stringify(props)}</p>
diff --git a/test/integration/page-config/test/index.test.js b/test/integration/page-config/test/index.test.js
index 01933be5674e8..a1d8b649be145 100644
--- a/test/integration/page-config/test/index.test.js
+++ b/test/integration/page-config/test/index.test.js
@@ -88,4 +88,30 @@ describe('Page Config', () => {
       await reset()
     }
   })
+
+  it('shows error when page config is export from', async () => {
+    const reset = await uncommentExport('invalid/export-from.js')
+
+    try {
+      const { stderr } = await nextBuild(appDir, undefined, { stderr: true })
+      expect(stderr).toMatch(
+        /https:\/\/err\.sh\/vercel\/next\.js\/invalid-page-config/
+      )
+    } finally {
+      await reset()
+    }
+  })
+
+  it('shows error when page config is imported and exported', async () => {
+    const reset = await uncommentExport('invalid/import-export.js')
+
+    try {
+      const { stderr } = await nextBuild(appDir, undefined, { stderr: true })
+      expect(stderr).toMatch(
+        /https:\/\/err\.sh\/vercel\/next\.js\/invalid-page-config/
+      )
+    } finally {
+      await reset()
+    }
+  })
 })
diff --git a/test/integration/prerender-fallback-aspath/next.config.js b/test/integration/prerender-fallback-aspath/next.config.js
new file mode 100644
index 0000000000000..47a259eabaee2
--- /dev/null
+++ b/test/integration/prerender-fallback-aspath/next.config.js
@@ -0,0 +1,3 @@
+module.exports = {
+  target: 'experimental-serverless-trace',
+}
diff --git a/test/integration/prerender-fallback-aspath/pages/blog/[post]/[comment].js b/test/integration/prerender-fallback-aspath/pages/blog/[post]/[comment].js
new file mode 100644
index 0000000000000..b6637184b0e6f
--- /dev/null
+++ b/test/integration/prerender-fallback-aspath/pages/blog/[post]/[comment].js
@@ -0,0 +1,30 @@
+import { useRouter } from 'next/router'
+
+export default function Comment({ params }) {
+  const router = useRouter()
+
+  if (router.isFallback) return 'Loading...'
+
+  return (
+    <>
+      <p id="as-path">{router.asPath}</p>
+      <p id="query">{JSON.stringify(router.query)}</p>
+      <p id="params">{JSON.stringify(params)}</p>
+    </>
+  )
+}
+
+export const getStaticProps = ({ params }) => {
+  return {
+    props: {
+      params,
+    },
+  }
+}
+
+export const getStaticPaths = () => {
+  return {
+    paths: [],
+    fallback: true,
+  }
+}
diff --git a/test/integration/prerender-fallback-aspath/pages/blog/[post]/index.js b/test/integration/prerender-fallback-aspath/pages/blog/[post]/index.js
new file mode 100644
index 0000000000000..6871672d42691
--- /dev/null
+++ b/test/integration/prerender-fallback-aspath/pages/blog/[post]/index.js
@@ -0,0 +1,30 @@
+import { useRouter } from 'next/router'
+
+export default function Post({ params }) {
+  const router = useRouter()
+
+  if (router.isFallback) return 'Loading...'
+
+  return (
+    <>
+      <p id="as-path">{router.asPath}</p>
+      <p id="query">{JSON.stringify(router.query)}</p>
+      <p id="params">{JSON.stringify(params)}</p>
+    </>
+  )
+}
+
+export const getStaticProps = ({ params }) => {
+  return {
+    props: {
+      params,
+    },
+  }
+}
+
+export const getStaticPaths = () => {
+  return {
+    paths: [],
+    fallback: true,
+  }
+}
diff --git a/test/integration/prerender-fallback-aspath/server.js b/test/integration/prerender-fallback-aspath/server.js
new file mode 100644
index 0000000000000..f6bcbd4857443
--- /dev/null
+++ b/test/integration/prerender-fallback-aspath/server.js
@@ -0,0 +1,31 @@
+const http = require('http')
+const url = require('url')
+
+const server = http.createServer(async (req, res) => {
+  try {
+    const { pathname } = url.parse(req.url)
+
+    switch (pathname) {
+      case '/blog/[post]':
+      case '/web-app/blog/[post]':
+        return require('./.next/serverless/pages/blog/[post].js').render(
+          req,
+          res
+        )
+      case '/blog/[post]/[comment]':
+      case '/web-app/blog/[post]/[comment]':
+        return require('./.next/serverless/pages/blog/[post]/[comment].js').render(
+          req,
+          res
+        )
+      default:
+        return res.end('404')
+    }
+  } catch (err) {
+    console.error('error rendering', err)
+  }
+})
+
+server.listen(process.env.PORT, () => {
+  console.log('ready on', process.env.PORT)
+})
diff --git a/test/integration/prerender-fallback-aspath/test/index.test.js b/test/integration/prerender-fallback-aspath/test/index.test.js
new file mode 100644
index 0000000000000..f4470ee1266f8
--- /dev/null
+++ b/test/integration/prerender-fallback-aspath/test/index.test.js
@@ -0,0 +1,121 @@
+/* eslint-env jest */
+
+import fs from 'fs-extra'
+import { join } from 'path'
+import cheerio from 'cheerio'
+import {
+  initNextServerScript,
+  killApp,
+  findPort,
+  nextBuild,
+  fetchViaHTTP,
+} from 'next-test-utils'
+
+jest.setTimeout(1000 * 60 * 2)
+
+const appDir = join(__dirname, '..')
+let app
+let appPort
+
+describe('Fallback asPath normalizing', () => {
+  beforeAll(async () => {
+    const startServerlessEmulator = async (dir, port, buildId) => {
+      const scriptPath = join(dir, 'server.js')
+      const env = Object.assign({}, { ...process.env }, { PORT: port })
+      return initNextServerScript(scriptPath, /ready on/i, env, false)
+    }
+    await fs.remove(join(appDir, '.next'))
+    await nextBuild(appDir)
+
+    appPort = await findPort()
+    app = await startServerlessEmulator(appDir, appPort)
+  })
+  afterAll(() => killApp(app))
+
+  it('should have normalized asPath for fallback page', async () => {
+    const html = await fetchViaHTTP(appPort, '/blog/[post]', undefined, {
+      headers: {
+        'x-now-route-matches': '1=post-1',
+        'x-vercel-id': 'hi',
+      },
+    }).then((res) => res.text())
+
+    const $ = cheerio.load(html)
+    const asPath = $('#as-path').text()
+    const query = JSON.parse($('#query').text())
+    const params = JSON.parse($('#params').text())
+
+    expect(asPath).toBe('/blog/post-1')
+    expect(query).toEqual({ post: 'post-1' })
+    expect(params).toEqual({ post: 'post-1' })
+  })
+
+  it('should have normalized asPath for fallback page with entry directory', async () => {
+    const html = await fetchViaHTTP(
+      appPort,
+      '/web-app/blog/[post]',
+      undefined,
+      {
+        headers: {
+          'x-now-route-matches': '1=post-abc',
+          'x-vercel-id': 'hi',
+        },
+      }
+    ).then((res) => res.text())
+
+    const $ = cheerio.load(html)
+    const asPath = $('#as-path').text()
+    const query = JSON.parse($('#query').text())
+    const params = JSON.parse($('#params').text())
+
+    expect(asPath).toBe('/web-app/blog/post-abc')
+    expect(query).toEqual({ post: 'post-abc' })
+    expect(params).toEqual({ post: 'post-abc' })
+  })
+
+  it('should have normalized asPath for fallback page multi-params', async () => {
+    const html = await fetchViaHTTP(
+      appPort,
+      '/blog/[post]/[comment]',
+      undefined,
+      {
+        headers: {
+          'x-now-route-matches': '1=post-1&2=comment-2',
+          'x-vercel-id': 'hi',
+        },
+      }
+    ).then((res) => res.text())
+
+    const $ = cheerio.load(html)
+    const asPath = $('#as-path').text()
+    const query = JSON.parse($('#query').text())
+    const params = JSON.parse($('#params').text())
+
+    expect(asPath).toBe('/blog/post-1/comment-2')
+    expect(query).toEqual({ post: 'post-1', comment: 'comment-2' })
+    expect(params).toEqual({ post: 'post-1', comment: 'comment-2' })
+  })
+
+  it('should have normalized asPath for fallback page with entry directory multi-params', async () => {
+    const html = await fetchViaHTTP(
+      appPort,
+      '/web-app/blog/[post]/[comment]',
+      undefined,
+      {
+        headers: {
+          'x-now-route-matches': '1=post-abc&2=comment-cba',
+          'x-vercel-id': 'hi',
+        },
+      }
+    ).then((res) => res.text())
+
+    const $ = cheerio.load(html)
+    const asPath = $('#as-path').text()
+    const query = JSON.parse($('#query').text())
+    const params = JSON.parse($('#params').text())
+
+    expect(asPath).toBe('/web-app/blog/post-abc/comment-cba')
+    expect(query).toEqual({ post: 'post-abc', comment: 'comment-cba' })
+    expect(params).toEqual({ post: 'post-abc', comment: 'comment-cba' })
+  })
+})
diff --git a/test/integration/prerender/next.config.js b/test/integration/prerender/next.config.js
index bab1f18474251..e98c3f9cb2bda 100644
--- a/test/integration/prerender/next.config.js
+++ b/test/integration/prerender/next.config.js
@@ -1,6 +1,11 @@
 module.exports = {
+  // target
   rewrites() {
     return [
+      {
+        source: '/some-rewrite/:item',
+        destination: '/blog/post-:item',
+      },
       {
         source: '/about',
         destination: '/lang/en/about',
diff --git a/test/integration/prerender/test/index.test.js b/test/integration/prerender/test/index.test.js
index 67a1e8eee22c1..f8e6b6810d30f 100644
--- a/test/integration/prerender/test/index.test.js
+++ b/test/integration/prerender/test/index.test.js
@@ -29,15 +29,15 @@ import url from 'url'
 
 jest.setTimeout(1000 * 60 * 2)
 const appDir = join(__dirname, '..')
-const nextConfig = join(appDir, 'next.config.js')
+const nextConfigPath = join(appDir, 'next.config.js')
 const indexPage = join(__dirname, '../pages/index.js')
+const nextConfig = new File(nextConfigPath)
 let app
 let appPort
 let buildId
 let distPagesDir
 let exportDir
 let stderr
-let origConfig
 
 const startServer = async (optEnv = {}) => {
   const scriptPath = join(appDir, 'server.js')
@@ -796,17 +796,26 @@ const runTests = (dev = false, isEmulatedServerless = false) => {
       expect(await browser.eval('window.beforeNav')).toBe('hi')
       expect(await browser.elementByCss('#about').text()).toBe('About: en')
     })
-  }
 
-  if (dev) {
-    it('should show error when rewriting to dynamic SSG page', async () => {
+    it('should not error when rewriting to fallback dynamic SSG page', async () => {
       const item = Math.round(Math.random() * 100)
-      const html = await renderViaHTTP(appPort, `/some-rewrite/${item}`)
-      expect(html).toContain(
-        `Rewrites don't support dynamic pages with getStaticProps yet`
+      const browser = await webdriver(appPort, `/some-rewrite/${item}`)
+
+      await check(
+        () => browser.elementByCss('p').text(),
+        new RegExp(`Post: post-${item}`)
       )
+
+      expect(JSON.parse(await browser.elementByCss('#params').text())).toEqual({
+        post: `post-${item}`,
+      })
+      expect(JSON.parse(await browser.elementByCss('#query').text())).toEqual({
+        post: `post-${item}`,
+      })
     })
+  }
 
+  if (dev) {
     it('should not show warning from url prop being returned', async () => {
       const urlPropPage = join(appDir, 'pages/url-prop.js')
       await fs.writeFile(
@@ -1707,30 +1716,6 @@ const runTests = (dev = false, isEmulatedServerless = false) => {
 describe('SSG Prerender', () => {
   describe('dev mode', () => {
     beforeAll(async () => {
-      origConfig = await fs.readFile(nextConfig, 'utf8')
-      await fs.writeFile(
-        nextConfig,
-        `
-        module.exports = {
-          rewrites() {
-            return [
-              {
-                source: "/some-rewrite/:item",
-                destination: "/blog/post-:item"
-              },
-              {
-                source: '/about',
-                destination: '/lang/en/about'
-              },
-              {
-                source: '/blocked-create',
-                destination: '/blocking-fallback/blocked-create',
-              }
-            ]
-          }
-        }
-      `
-      )
       appPort = await findPort()
       app = await launchApp(appDir, appPort, {
         env: { __NEXT_TEST_WITH_DEVTOOL: 1 },
@@ -1741,7 +1726,6 @@ describe('SSG Prerender', () => {
       buildId = 'development'
     })
     afterAll(async () => {
-      await fs.writeFile(nextConfig, origConfig)
       await killApp(app)
     })
 
@@ -1750,13 +1734,10 @@ describe('SSG Prerender', () => {
 
   describe('dev mode getStaticPaths', () => {
     beforeAll(async () => {
-      origConfig = await fs.readFile(nextConfig, 'utf8')
-      await fs.writeFile(
-        nextConfig,
+      nextConfig.write(
         // we set cpus to 1 so that we make sure the requests
         // aren't being cached at the jest-worker level
-        `module.exports = { experimental: { cpus: 1 } }`,
-        'utf8'
+        `module.exports = { experimental: { cpus: 1 } }`
       )
       await fs.remove(join(appDir, '.next'))
       appPort = await findPort()
@@ -1765,7 +1746,7 @@ describe('SSG Prerender', () => {
       })
     })
     afterAll(async () => {
-      await fs.writeFile(nextConfig, origConfig)
+      nextConfig.restore()
       await killApp(app)
     })
 
@@ -1808,7 +1789,6 @@ describe('SSG Prerender', () => {
     beforeAll(async () => {
       // remove firebase import since it breaks in legacy serverless mode
       origBlogPageContent = await fs.readFile(blogPagePath, 'utf8')
-      origConfig = await fs.readFile(nextConfig, 'utf8')
 
       await fs.writeFile(
         blogPagePath,
@@ -1818,25 +1798,7 @@ describe('SSG Prerender', () => {
         )
       )
 
-      await fs.writeFile(
-        nextConfig,
-        `module.exports = {
-          target: 'serverless',
-          rewrites() {
-            return [
-              {
-                source: '/about',
-                destination: '/lang/en/about'
-              },
-              {
-                source: '/blocked-create',
-                destination: '/blocking-fallback/blocked-create',
-              }
-            ]
-          }
-        }`,
-        'utf8'
-      )
+      nextConfig.replace('// target', `target: 'serverless',`)
       await fs.remove(join(appDir, '.next'))
       await nextBuild(appDir)
       stderr = ''
@@ -1850,7 +1812,7 @@ describe('SSG Prerender', () => {
       buildId = await fs.readFile(join(appDir, '.next/BUILD_ID'), 'utf8')
     })
     afterAll(async () => {
-      await fs.writeFile(nextConfig, origConfig)
+      nextConfig.restore()
       await fs.writeFile(blogPagePath, origBlogPageContent)
       await killApp(app)
     })
@@ -1931,11 +1893,9 @@ describe('SSG Prerender', () => {
         })
       }
 
-      origConfig = await fs.readFile(nextConfig, 'utf8')
-      await fs.writeFile(
-        nextConfig,
-        `module.exports = { target: 'experimental-serverless-trace' }`,
-        'utf8'
+      await nextConfig.replace(
+        '// target',
+        `target: 'experimental-serverless-trace',`
       )
       await fs.writeFile(
         cstmError,
@@ -1963,8 +1923,8 @@ describe('SSG Prerender', () => {
       app = await startServerlessEmulator(appDir, appPort, buildId)
     })
     afterAll(async () => {
+      nextConfig.restore()
       await fs.remove(cstmError)
-      await fs.writeFile(nextConfig, origConfig)
       await killApp(app)
     })
 
@@ -2024,9 +1984,7 @@ describe('SSG Prerender', () => {
 
     beforeAll(async () => {
       exportDir = join(appDir, 'out')
-      origConfig = await fs.readFile(nextConfig, 'utf8')
-      await fs.writeFile(
-        nextConfig,
+      nextConfig.write(
         `module.exports = {
           exportTrailingSlash: true,
           exportPathMap: function(defaultPathMap) {
@@ -2075,7 +2033,7 @@ describe('SSG Prerender', () => {
       buildId = await fs.readFile(join(appDir, '.next/BUILD_ID'), 'utf8')
     })
     afterAll(async () => {
-      await fs.writeFile(nextConfig, origConfig)
+      nextConfig.restore()
       await stopApp(app)
 
       for (const page of fallbackTruePages) {
diff --git a/test/integration/production/pages/css-and-back.js b/test/integration/production/pages/css-and-back.js
new file mode 100644
index 0000000000000..41b3aea0e46a4
--- /dev/null
+++ b/test/integration/production/pages/css-and-back.js
@@ -0,0 +1,16 @@
+import Link from 'next/link'
+
+const Page = ({ from }) => (
+  <div>
+    <p>{from}</p>
+    <Link href="/css-modules">
+      <a>Page with CSS</a>
+    </Link>
+  </div>
+)
+
+Page.getInitialProps = () => {
+  return { from: typeof window === 'undefined' ? 'server' : 'client' }
+}
+
+export default Page
diff --git a/test/integration/production/pages/css-modules.js b/test/integration/production/pages/css-modules.js
index 86a3aa6df7053..ec1906172bcb3 100644
--- a/test/integration/production/pages/css-modules.js
+++ b/test/integration/production/pages/css-modules.js
@@ -3,5 +3,6 @@ import Logo from '../components/logo'
 export default () => (
   <div>
     <Logo />
+    <input />
   </div>
 )
diff --git a/test/integration/production/test/index.test.js b/test/integration/production/test/index.test.js
index f9daa94aa3541..467eeb42c114d 100644
--- a/test/integration/production/test/index.test.js
+++ b/test/integration/production/test/index.test.js
@@ -417,6 +417,23 @@ describe('Production Usage', () => {
     expect(newText).toBe('server')
   })
 
+  it('should navigate to page with CSS and back', async () => {
+    const browser = await webdriver(appPort, '/css-and-back')
+    const initialText = await browser.elementByCss('p').text()
+    expect(initialText).toBe('server')
+
+    await browser
+      .elementByCss('a')
+      .click()
+      .waitForElementByCss('input')
+      .back()
+      .waitForElementByCss('p')
+
+    await waitFor(1000)
+    const newText = await browser.elementByCss('p').text()
+    expect(newText).toBe('client')
+  })
+
   it('should navigate to external site and back (with query)', async () => {
     const browser = await webdriver(appPort, '/external-and-back?hello=world')
     const initialText = await browser.elementByCss('p').text()
diff --git a/test/integration/size-limit/test/index.test.js b/test/integration/size-limit/test/index.test.js
index 36628b7511dcc..1b683cdd7f15e 100644
--- a/test/integration/size-limit/test/index.test.js
+++ b/test/integration/size-limit/test/index.test.js
@@ -80,7 +80,7 @@ describe('Production response size', () => {
     )
 
     // These numbers are without gzip compression!
-    const delta = responseSizesBytes - 275 * 1024
+    const delta = responseSizesBytes - 277 * 1024
     expect(delta).toBeLessThanOrEqual(1024) // don't increase size more than 1kb
     expect(delta).toBeGreaterThanOrEqual(-1024) // don't decrease size more than 1kb without updating target
   })
@@ -100,7 +100,7 @@ describe('Production response size', () => {
     )
 
     // These numbers are without gzip compression!
-    const delta = responseSizesBytes - 167 * 1024
+    const delta = responseSizesBytes - 168 * 1024
     expect(delta).toBeLessThanOrEqual(1024) // don't increase size more than 1kb
     expect(delta).toBeGreaterThanOrEqual(-1024) // don't decrease size more than 1kb without updating target
   })
diff --git a/test/integration/trailing-slashes-rewrite/next.config.js b/test/integration/trailing-slashes-rewrite/next.config.js
new file mode 100644
index 0000000000000..502e173f44543
--- /dev/null
+++ b/test/integration/trailing-slashes-rewrite/next.config.js
@@ -0,0 +1,16 @@
+module.exports = {
+  trailingSlash: true,
+
+  async rewrites() {
+    return [
+      {
+        source: '/:path*/',
+        destination: '/:path*/',
+      },
+      {
+        source: '/:path*/',
+        destination: 'http://localhost:__EXTERNAL_PORT__/:path*',
+      },
+    ]
+  },
+}
diff --git a/test/integration/trailing-slashes-rewrite/pages/catch-all/[...slug].js b/test/integration/trailing-slashes-rewrite/pages/catch-all/[...slug].js
new file mode 100644
index 0000000000000..a689f91e2eacd
--- /dev/null
+++ b/test/integration/trailing-slashes-rewrite/pages/catch-all/[...slug].js
@@ -0,0 +1,3 @@
+export default function Page() {
+  return <p>catch-all</p>
+}
diff --git a/test/integration/trailing-slashes-rewrite/pages/index.js b/test/integration/trailing-slashes-rewrite/pages/index.js
new file mode 100644
index 0000000000000..c447103b223e0
--- /dev/null
+++ b/test/integration/trailing-slashes-rewrite/pages/index.js
@@ -0,0 +1,3 @@
+export default function Index() {
+  return <p>index page</p>
+}
diff --git a/test/integration/trailing-slashes-rewrite/pages/products/[product].js b/test/integration/trailing-slashes-rewrite/pages/products/[product].js
new file mode 100644
index 0000000000000..ef8d88e2f6105
--- /dev/null
+++ b/test/integration/trailing-slashes-rewrite/pages/products/[product].js
@@ -0,0 +1,3 @@
+export default function Products() {
+  return <p>a product</p>
+}
diff --git a/test/integration/trailing-slashes-rewrite/pages/products/index.js b/test/integration/trailing-slashes-rewrite/pages/products/index.js
new file mode 100644
index 0000000000000..1e8d3d0003ffe
--- /dev/null
+++ b/test/integration/trailing-slashes-rewrite/pages/products/index.js
@@ -0,0 +1,3 @@
+export default function Products() {
+  return <p>some products</p>
+}
diff --git a/test/integration/trailing-slashes-rewrite/server.js b/test/integration/trailing-slashes-rewrite/server.js
new file mode 100644
index 0000000000000..ee552bdda18e0
--- /dev/null
+++ b/test/integration/trailing-slashes-rewrite/server.js
@@ -0,0 +1,10 @@
+const http = require('http')
+const server = http.createServer((req, res) => {
+  console.log('got request', req.url)
+  res.end(req.url)
+})
+const port = process.env.PORT || 3000
+
+server.listen(port, () => {
+  console.log('Ready on http://localhost:' + port)
+})
diff --git a/test/integration/trailing-slashes-rewrite/test/index.test.js b/test/integration/trailing-slashes-rewrite/test/index.test.js
new file mode 100644
index 0000000000000..56a58afe46e94
--- /dev/null
+++ b/test/integration/trailing-slashes-rewrite/test/index.test.js
@@ -0,0 +1,103 @@
+/* eslint-env jest */
+import { join } from 'path'
+import {
+  findPort,
+  killApp,
+  nextBuild,
+  nextStart,
+  File,
+  initNextServerScript,
+  renderViaHTTP,
+  launchApp,
+} from 'next-test-utils'
+
+jest.setTimeout(1000 * 60 * 2)
+
+let app
+let appPort
+let proxyPort
+let proxyServer
+const appDir = join(__dirname, '../')
+const nextConfig = new File(join(appDir, 'next.config.js'))
+
+const runTests = () => {
+  it('should resolve index page correctly', async () => {
+    const html = await renderViaHTTP(appPort, '/')
+    expect(html).toContain('index page')
+  })
+
+  it('should resolve products page correctly', async () => {
+    const html = await renderViaHTTP(appPort, '/products')
+    expect(html).toContain('some products')
+  })
+
+  it('should resolve a dynamic page correctly', async () => {
+    const html = await renderViaHTTP(appPort, '/products/first')
+    expect(html).toContain('a product')
+  })
+
+  it('should resolve a catch-all page correctly', async () => {
+    const html = await renderViaHTTP(appPort, '/catch-all/hello')
+    expect(html).toContain('catch-all')
+  })
+
+  it('should proxy non-existent page correctly', async () => {
+    const html = await renderViaHTTP(appPort, '/non-existent')
+    expect(html).toBe('/non-existent')
+  })
+}
+
+describe('Trailing Slash Rewrite Proxying', () => {
+  describe('production mode', () => {
+    beforeAll(async () => {
+      proxyPort = await findPort()
+      proxyServer = await initNextServerScript(
+        join(appDir, 'server.js'),
+        /ready on/i,
+        {
+          ...process.env,
+          PORT: proxyPort,
+        }
+      )
+
+      nextConfig.replace('__EXTERNAL_PORT__', proxyPort)
+
+      await nextBuild(appDir)
+      appPort = await findPort()
+      app = await nextStart(appDir, appPort)
+    })
+    afterAll(async () => {
+      nextConfig.restore()
+      await killApp(app)
+      await killApp(proxyServer)
+    })
+
+    runTests()
+  })
+
+  describe('dev mode', () => {
+    beforeAll(async () => {
+      proxyPort = await findPort()
+      proxyServer = await initNextServerScript(
+        join(appDir, 'server.js'),
+        /ready on/i,
+        {
+          ...process.env,
+          PORT: proxyPort,
+        }
+      )
+
+      nextConfig.replace('__EXTERNAL_PORT__', proxyPort)
+
+      appPort = await findPort()
+      app = await launchApp(appDir, appPort)
+    })
+    afterAll(async () => {
+      nextConfig.restore()
+      await killApp(app)
+      await killApp(proxyServer)
+    })
+
+    runTests()
+  })
+})
diff --git a/yarn.lock b/yarn.lock
index 4e2c259981d24..f0ab3d33bc4f3 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5317,7 +5317,7 @@ caniuse-db@^1.0.30000529, caniuse-db@^1.0.30000634:
   version "1.0.30001023"
   resolved "https://registry.yarnpkg.com/caniuse-db/-/caniuse-db-1.0.30001023.tgz#f856f71af16a5a44e81f1fcefc1673912a43da72"
 
-caniuse-lite@^1.0.0, caniuse-lite@^1.0.30000981, caniuse-lite@^1.0.30001019, caniuse-lite@^1.0.30001020, caniuse-lite@^1.0.30001093:
+caniuse-lite@^1.0.0, caniuse-lite@^1.0.30000981, caniuse-lite@^1.0.30001019, caniuse-lite@^1.0.30001020, caniuse-lite@^1.0.30001093, caniuse-lite@^1.0.30001113:
   version "1.0.30001066"
   resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30001066.tgz#0a8a58a10108f2b9bf38e7b65c237b12fd9c5f04"
   integrity sha512-Gfj/WAastBtfxLws0RCh2sDbTK/8rJuSeZMecrSkNGYxPcv7EzblmDGfWQCFEQcSqYE2BRgQiJh8HOD07N5hIw==
@@ -5352,7 +5352,7 @@ chalk@2.4.0:
     escape-string-regexp "^1.0.5"
     supports-color "^5.3.0"
 
-chalk@2.4.2, chalk@^2.0.0, chalk@^2.0.1, chalk@^2.1.0, chalk@^2.3.0, chalk@^2.3.1, chalk@^2.4.0, chalk@^2.4.1, chalk@^2.4.2:
+chalk@2.4.2, chalk@^2.0.0, chalk@^2.0.1, chalk@^2.1.0, chalk@^2.3.1, chalk@^2.4.0, chalk@^2.4.1, chalk@^2.4.2:
   version "2.4.2"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.2.tgz#cd42541677a54333cf541a49108c1432b44c9424"
   dependencies:
@@ -10351,10 +10351,10 @@ jest-worker@^26.0.0:
     merge-stream "^2.0.0"
     supports-color "^7.0.0"
 
-jest-worker@^26.1.0:
-  version "26.2.1"
-  resolved "https://registry.yarnpkg.com/jest-worker/-/jest-worker-26.2.1.tgz#5d630ab93f666b53f911615bc13e662b382bd513"
-  integrity sha512-+XcGMMJDTeEGncRb5M5Zq9P7K4sQ1sirhjdOxsN1462h6lFo9w59bl2LVQmdGEEeU3m+maZCkS2Tcc9SfCHO4A==
+jest-worker@^26.3.0:
+  version "26.3.0"
+  resolved "https://registry.yarnpkg.com/jest-worker/-/jest-worker-26.3.0.tgz#7c8a97e4f4364b4f05ed8bca8ca0c24de091871f"
+  integrity sha512-Vmpn2F6IASefL+DVBhPzI2J9/GJUsqzomdeN+P+dK8/jKxbh8R3BtFnx3FIta7wYlPU62cpJMJQo4kuOowcMnw==
   dependencies:
     "@types/node" "*"
     merge-stream "^2.0.0"
@@ -10663,13 +10663,6 @@ last-call-webpack-plugin@^3.0.0:
     lodash "^4.17.5"
     webpack-sources "^1.1.0"
 
-launch-editor@2.2.1:
-  version "2.2.1"
-  resolved "https://registry.yarnpkg.com/launch-editor/-/launch-editor-2.2.1.tgz#871b5a3ee39d6680fcc26d37930b6eeda89db0ca"
-  dependencies:
-    chalk "^2.3.0"
-    shell-quote "^1.6.1"
-
 lazy-cache@^0.2.3:
   version "0.2.7"
   resolved "https://registry.yarnpkg.com/lazy-cache/-/lazy-cache-0.2.7.tgz#7feddf2dcb6edb77d11ef1d117ab5ffdf0ab1b65"
@@ -14068,14 +14061,6 @@ promzard@^0.3.0:
   dependencies:
     read "1"
 
-prop-types-exact@1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/prop-types-exact/-/prop-types-exact-1.2.0.tgz#825d6be46094663848237e3925a98c6e944e9869"
-  dependencies:
-    has "^1.0.3"
-    object.assign "^4.1.0"
-    reflect.ownkeys "^0.2.0"
-
 prop-types@15.7.2, prop-types@^15.6.2, prop-types@^15.7.2:
   version "15.7.2"
   resolved "https://registry.yarnpkg.com/prop-types/-/prop-types-15.7.2.tgz#52c41e75b8c87e72b9d9360e0206b99dcbffa6c5"
@@ -14563,10 +14548,6 @@ reduce-function-call@^1.0.1:
   dependencies:
     balanced-match "^1.0.0"
 
-reflect.ownkeys@^0.2.0:
-  version "0.2.0"
-  resolved "https://registry.yarnpkg.com/reflect.ownkeys/-/reflect.ownkeys-0.2.0.tgz#749aceec7f3fdf8b63f927a04809e90c5c0b3460"
-
 regenerate-unicode-properties@^8.1.0:
   version "8.1.0"
   resolved "https://registry.yarnpkg.com/regenerate-unicode-properties/-/regenerate-unicode-properties-8.1.0.tgz#ef51e0f0ea4ad424b77bf7cb41f3e015c70a3f0e"
@@ -16407,19 +16388,19 @@ temp@^0.8.1:
   dependencies:
     rimraf "~2.6.2"
 
-terser-webpack-plugin@3.0.8:
-  version "3.0.8"
-  resolved "https://registry.yarnpkg.com/terser-webpack-plugin/-/terser-webpack-plugin-3.0.8.tgz#d1a53442a143e09e00c880e8d77c1e79cb05318b"
-  integrity sha512-ygwK8TYMRTYtSyLB2Mhnt90guQh989CIq/mL/2apwi6rA15Xys4ydNUiH4ah6EZCfQxSk26ZFQilZ4IQ6IZw6A==
+terser-webpack-plugin@4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/terser-webpack-plugin/-/terser-webpack-plugin-4.1.0.tgz#6e9d6ae4e1a900d88ddce8da6a47507ea61f44bc"
+  integrity sha512-0ZWDPIP8BtEDZdChbufcXUigOYk6dOX/P/X0hWxqDDcVAQLb8Yy/0FAaemSfax3PAA67+DJR778oz8qVbmy4hA==
   dependencies:
     cacache "^15.0.5"
     find-cache-dir "^3.3.1"
-    jest-worker "^26.1.0"
+    jest-worker "^26.3.0"
     p-limit "^3.0.2"
     schema-utils "^2.6.6"
     serialize-javascript "^4.0.0"
     source-map "^0.6.1"
-    terser "^4.8.0"
+    terser "^5.0.0"
     webpack-sources "^1.4.3"
 
 terser-webpack-plugin@^1.4.3:
@@ -16437,18 +16418,19 @@ terser-webpack-plugin@^1.4.3:
     webpack-sources "^1.4.0"
     worker-farm "^1.7.0"
 
-terser@4.4.2:
-  version "4.4.2"
-  resolved "https://registry.yarnpkg.com/terser/-/terser-4.4.2.tgz#448fffad0245f4c8a277ce89788b458bfd7706e8"
+terser@4.8.0, terser@^4.1.2:
+  version "4.8.0"
+  resolved "https://registry.yarnpkg.com/terser/-/terser-4.8.0.tgz#63056343d7c70bb29f3af665865a46fe03a0df17"
+  integrity sha512-EAPipTNeWsb/3wLPeup1tVPaXfIaU68xMnVdPafIL1TV05OhASArYyIfFvnvJCNrR2NIOvDVNNTFRa+Re2MWyw==
   dependencies:
     commander "^2.20.0"
     source-map "~0.6.1"
     source-map-support "~0.5.12"
 
-terser@4.8.0, terser@^4.1.2, terser@^4.8.0:
-  version "4.8.0"
-  resolved "https://registry.yarnpkg.com/terser/-/terser-4.8.0.tgz#63056343d7c70bb29f3af665865a46fe03a0df17"
-  integrity sha512-EAPipTNeWsb/3wLPeup1tVPaXfIaU68xMnVdPafIL1TV05OhASArYyIfFvnvJCNrR2NIOvDVNNTFRa+Re2MWyw==
+terser@5.1.0, terser@^5.0.0:
+  version "5.1.0"
+  resolved "https://registry.yarnpkg.com/terser/-/terser-5.1.0.tgz#1f4ab81c8619654fdded51f3157b001e1747281d"
+  integrity sha512-pwC1Jbzahz1ZPU87NQ8B3g5pKbhyJSiHih4gLH6WZiPU8mmS1IlGbB0A2Nuvkj/LCNsgIKctg6GkYwWCeTvXZQ==
   dependencies:
     commander "^2.20.0"
     source-map "~0.6.1"