hugojosefson/sapper-template-rollup

My Sapper template fork, based on sveltejs/sapper-template#rollup.

Using Prettier.js for formatting of all files, with default linting rules from standard.js. Also, running Cypress via docker by default, instead of requiring it to be installed.

Getting started

Using degit

degit is a scaffolding tool that lets you create a directory from a branch in a repository.

npx degit "hugojosefson/sapper-template-rollup" my-app

Running the project

However you get the code, you can install dependencies and run the project in development mode with:

cd my-app
yarn
yarn dev

Open up localhost:3000 and start clicking around.

Consult sapper.svelte.dev for help getting started.

Structure

Sapper expects to find two directories in the root of your project — src and static.

src

The src directory contains the entry points for your app — client.js, server.js and (optionally) a service-worker.js — along with a template.html file and a routes directory.

src/routes

This is the heart of your Sapper app. There are two kinds of routes — pages, and server routes.

Pages are Svelte components written in .svelte files. When a user first visits the application, they will be served a server-rendered version of the route in question, plus some JavaScript that 'hydrates' the page and initialises a client-side router. From that point forward, navigating to other pages is handled entirely on the client for a fast, app-like feel. (Sapper will preload and cache the code for these subsequent pages, so that navigation is instantaneous.)

Server routes are modules written in .js files, that export functions corresponding to HTTP methods. Each function receives Express request and response objects as arguments, plus a next function. This is useful for creating a JSON API, for example.

There are three simple rules for naming the files that define your routes:

• A file called src/routes/about.svelte corresponds to the /about route. A file called src/routes/blog/[slug].svelte corresponds to the /blog/:slug route, in which case params.slug is available to the route
• The file src/routes/index.svelte (or src/routes/index.js) corresponds to the root of your app. src/routes/about/index.svelte is treated the same as src/routes/about.svelte.
• Files and directories with a leading underscore do not create routes. This allows you to colocate helper modules and components with the routes that depend on them — for example you could have a file called src/routes/_helpers/datetime.js and it would not create a /_helpers/datetime route

static

The static directory contains any static assets that should be available. These are served using sirv.

In your service-worker.js file, you can import these as files from the generated manifest...

import { files } from '@sapper/service-worker'

...so that you can cache them (though you can choose not to, for example if you don't want to cache very large files).

Bundler config

My template here uses Rollup to provide code-splitting and dynamic imports, as well as compiling your Svelte components. As long as you don't do anything daft, you can edit the configuration files to add whatever plugins you'd like.

Production mode and deployment

To start a production version of your app, run yarn build && yarn start. This will disable live reloading, and activate the appropriate bundler plugins.

You can deploy your application to any environment that supports Node 10 or above. As an example, to deploy to ZEIT Now when using sapper export, run this command:

npx now

If your app can't be exported to a static site, you can use the now-sapper builder. You can find instructions on how to do so in its README.

Using external components

When using Svelte components installed from npm, such as @sveltejs/svelte-virtual-list, Svelte needs the original component source (rather than any precompiled JavaScript that ships with the component). This allows the component to be rendered server-side, and also keeps your client-side app smaller.

Because of that, it's essential that the bundler doesn't treat the package as an external dependency. You can either modify the external option under server in rollup.config.js, or simply install the package to devDependencies rather than dependencies, which will cause it to get bundled (and therefore compiled) with your app:

yarn add --dev @sveltejs/svelte-virtual-list

Bugs and feedback

Sapper is in early development, and may have the odd rough edge here and there. Please be vocal over on the Sapper issue tracker.