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Add environment variable to control image inlining threshold #6060

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Jun 18, 2019
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Add environment variable to control image inlining threshold #6060

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ca6f07e
environment variable to disable inlining images
peterbe Dec 18, 2018
0aec3f4
environment variable to disable inlining images
peterbe Dec 18, 2018
5776c2f
Merge remote-tracking branch 'peter/3437-environment-variable-to-disa…
some1else Apr 1, 2019
ce4dfba
Merge pull request #1 from some1else/3437-environment-variable-to-dis…
Apr 1, 2019
756cb29
Merge branch 'master' into 3437-environment-variable-to-disable-inlin…
ianschmitz Jun 14, 2019
c3a7e6c
Update adding-images-fonts-and-files.md
ianschmitz Jun 14, 2019
00eb517
Update advanced-configuration.md
ianschmitz Jun 18, 2019
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6 changes: 6 additions & 0 deletions docusaurus/docs/adding-images-fonts-and-files.md
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Expand Up @@ -9,6 +9,12 @@ You can **`import` a file right in a JavaScript module**. This tells Webpack to

To reduce the number of requests to the server, importing images that are less than 10,000 bytes returns a [data URI](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs) instead of a path. This applies to the following file extensions: bmp, gif, jpg, jpeg, and png. SVG files are excluded due to [#1153](https://github.com/facebook/create-react-app/issues/1153).

To override the default set the environment variable `IMAGE_INLINE_SIZE_LIMIT`. For example:
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```bash
IMAGE_INLINE_SIZE_LIMIT=5000 npm run build
```

Here is an example:

```js
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27 changes: 14 additions & 13 deletions docusaurus/docs/advanced-configuration.md
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Expand Up @@ -5,16 +5,17 @@ title: Advanced Configuration

You can adjust various development and production settings by setting environment variables in your shell or with [.env](adding-custom-environment-variables.md#adding-development-environment-variables-in-env).

| Variable | Development | Production | Usage |
| :------------------- | :---------: | :--------: | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| BROWSER | ✅ Used | 🚫 Ignored | By default, Create React App will open the default system browser, favoring Chrome on macOS. Specify a [browser](https://github.com/sindresorhus/opn#app) to override this behavior, or set it to `none` to disable it completely. If you need to customize the way the browser is launched, you can specify a node script instead. Any arguments passed to `npm start` will also be passed to this script, and the url where your app is served will be the last argument. Your script's file name must have the `.js` extension. |
| HOST | ✅ Used | 🚫 Ignored | By default, the development web server binds to `localhost`. You may use this variable to specify a different host. |
| PORT | ✅ Used | 🚫 Ignored | By default, the development web server will attempt to listen on port 3000 or prompt you to attempt the next available port. You may use this variable to specify a different port. |
| HTTPS | ✅ Used | 🚫 Ignored | When set to `true`, Create React App will run the development server in `https` mode. |
| PUBLIC_URL | 🚫 Ignored | ✅ Used | Create React App assumes your application is hosted at the serving web server's root or a subpath as specified in [`package.json` (`homepage`)](deployment#building-for-relative-paths). Normally, Create React App ignores the hostname. You may use this variable to force assets to be referenced verbatim to the url you provide (hostname included.md). This may be particularly useful when using a CDN to host your application. |
| CI | ✅ Used | ✅ Used | When set to `true`, Create React App treats warnings as failures in the build. It also makes the test runner non-watching. Most CIs set this flag by default. |
| REACT_EDITOR | ✅ Used | 🚫 Ignored | When an app crashes in development, you will see an error overlay with clickable stack trace. When you click on it, Create React App will try to determine the editor you are using based on currently running processes, and open the relevant source file. You can [send a pull request to detect your editor of choice](https://github.com/facebook/create-react-app/issues/2636). Setting this environment variable overrides the automatic detection. If you do it, make sure your systems [PATH](<https://en.wikipedia.org/wiki/PATH_(variable)>) environment variable points to your editor’s bin folder. You can also set it to `none` to disable it completely. |
| CHOKIDAR_USEPOLLING | ✅ Used | 🚫 Ignored | When set to `true`, the watcher runs in polling mode, as necessary inside a VM. Use this option if `npm start` isn't detecting changes. |
| GENERATE_SOURCEMAP | 🚫 Ignored | ✅ Used | When set to `false`, source maps are not generated for a production build. This solves OOM issues on some smaller machines. |
| NODE_PATH | ✅ Used | ✅ Used | Same as [`NODE_PATH` in Node.js](https://nodejs.org/api/modules.html#modules_loading_from_the_global_folders), but only relative folders are allowed. Can be handy for emulating a monorepo setup by setting `NODE_PATH=src`. |
| INLINE_RUNTIME_CHUNK | 🚫 Ignored | ✅ Used | By default, Create React App will embed the runtime script into `index.html` during the production build. When set to `false`, the script will not be embedded and will be imported as usual. This is normally required when dealing with CSP. |
| Variable | Development | Production | Usage |
| :---------------------- | :---------: | :--------: | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| BROWSER | ✅ Used | 🚫 Ignored | By default, Create React App will open the default system browser, favoring Chrome on macOS. Specify a [browser](https://github.com/sindresorhus/opn#app) to override this behavior, or set it to `none` to disable it completely. If you need to customize the way the browser is launched, you can specify a node script instead. Any arguments passed to `npm start` will also be passed to this script, and the url where your app is served will be the last argument. Your script's file name must have the `.js` extension. |
| HOST | ✅ Used | 🚫 Ignored | By default, the development web server binds to `localhost`. You may use this variable to specify a different host. |
| PORT | ✅ Used | 🚫 Ignored | By default, the development web server will attempt to listen on port 3000 or prompt you to attempt the next available port. You may use this variable to specify a different port. |
| HTTPS | ✅ Used | 🚫 Ignored | When set to `true`, Create React App will run the development server in `https` mode. |
| PUBLIC_URL | 🚫 Ignored | ✅ Used | Create React App assumes your application is hosted at the serving web server's root or a subpath as specified in [`package.json` (`homepage`)](deployment#building-for-relative-paths). Normally, Create React App ignores the hostname. You may use this variable to force assets to be referenced verbatim to the url you provide (hostname included.md). This may be particularly useful when using a CDN to host your application. |
| CI | ✅ Used | ✅ Used | When set to `true`, Create React App treats warnings as failures in the build. It also makes the test runner non-watching. Most CIs set this flag by default. |
| REACT_EDITOR | ✅ Used | 🚫 Ignored | When an app crashes in development, you will see an error overlay with clickable stack trace. When you click on it, Create React App will try to determine the editor you are using based on currently running processes, and open the relevant source file. You can [send a pull request to detect your editor of choice](https://github.com/facebook/create-react-app/issues/2636). Setting this environment variable overrides the automatic detection. If you do it, make sure your systems [PATH](<https://en.wikipedia.org/wiki/PATH_(variable)>) environment variable points to your editor’s bin folder. You can also set it to `none` to disable it completely. |
| CHOKIDAR_USEPOLLING | ✅ Used | 🚫 Ignored | When set to `true`, the watcher runs in polling mode, as necessary inside a VM. Use this option if `npm start` isn't detecting changes. |
| GENERATE_SOURCEMAP | 🚫 Ignored | ✅ Used | When set to `false`, source maps are not generated for a production build. This solves OOM issues on some smaller machines. |
| NODE_PATH | ✅ Used | ✅ Used | Same as [`NODE_PATH` in Node.js](https://nodejs.org/api/modules.html#modules_loading_from_the_global_folders), but only relative folders are allowed. Can be handy for emulating a monorepo setup by setting `NODE_PATH=src`. |
| INLINE_RUNTIME_CHUNK | 🚫 Ignored | ✅ Used | By default, Create React App will embed the runtime script into `index.html` during the production build. When set to `false`, the script will not be embedded and will be imported as usual. This is normally required when dealing with CSP. |
| IMAGE_INLINE_SIZE_LIMIT | 🚫 Ignored | ✅ Used | Images smaller than 10,000 bytes are encoded as data-URI in base64 and inlined in the CSS or JS build artifact. Set this to control the minimum size limit. Setting it to 0 will make all images left as reference. |
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