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[![npm][npm]][npm-url] [![node][node]][node-url] [![deps][deps]][deps-url] [![tests][tests]][tests-url] [![coverage][cover]][cover-url] [![chat][chat]][chat-url] <div align="center"> <img width="180" height="180" hspace="10" alt="PostCSS Logo" src="https://api.postcss.org/logo.svg"> <a href="https://github.com/webpack/webpack"> <img width="200" height="200" hspace="10" src="https://cdn.rawgit.com/webpack/media/e7485eb2/logo/icon.svg"> </a> <div align="center"> <a href="https://evilmartians.com/?utm_source=postcss"> <img src="https://evilmartians.com/badges/sponsored-by-evil-martians.svg" alt="Sponsored by Evil Martians" width="236" height="54" vspace="10"> </a> </div> <h1>PostCSS Loader</h1> <p>Loader for <a href="https://webpack.js.org/">webpack</a> to process CSS with <a href="https://postcss.org/">PostCSS</a></p> </div> <h2 align="center">Install</h2> ```bash npm i -D postcss-loader ``` <h2 align="center">Usage</h2> ### `Configuration` **`postcss.config.js`** ```js module.exports = { parser: 'sugarss', plugins: { 'postcss-import': {}, 'postcss-preset-env': {}, 'cssnano': {} } } ``` You can read more about common PostCSS Config [here](https://github.com/michael-ciniawsky/postcss-load-config). ### `Config Cascade` You can use different `postcss.config.js` files in different directories. Config lookup starts from `path.dirname(file)` and walks the file tree upwards until a config file is found. ``` |– components | |– component | | |– index.js | | |– index.png | | |– style.css (1) | | |– postcss.config.js (1) | |– component | | |– index.js | | |– image.png | | |– style.css (2) | |– postcss.config.js (1 && 2 (recommended)) |– webpack.config.js | |– package.json ``` After setting up your `postcss.config.js`, add `postcss-loader` to your `webpack.config.js`. You can use it standalone or in conjunction with `css-loader` (recommended). Use it **after** `css-loader` and `style-loader`, but **before** other preprocessor loaders like e.g `sass|less|stylus-loader`, if you use any. **`webpack.config.js`** ```js module.exports = { module: { rules: [ { test: /\.css$/, use: [ 'style-loader', 'postcss-loader' ] } ] } } ``` > ⚠️ When `postcss-loader` is used standalone (without `css-loader`) don't use `@import` in your CSS, since this can lead to quite bloated bundles **`webpack.config.js` (recommended)** ```js module.exports = { module: { rules: [ { test: /\.css$/, use: [ 'style-loader', { loader: 'css-loader', options: { importLoaders: 1 } }, 'postcss-loader' ] } ] } } ``` <h2 align="center">Options</h2> |Name|Type|Default|Description| |:--:|:--:|:-----:|:----------| |[`exec`](#exec)|`{Boolean}`|`undefined`|Enable PostCSS Parser support in `CSS-in-JS`| |[`parser`](#syntaxes)|`{String\|Object}`|`undefined`|Set PostCSS Parser| |[`syntax`](#syntaxes)|`{String\|Object}`|`undefined`|Set PostCSS Syntax| |[`stringifier`](#syntaxes)|`{String\|Object}`|`undefined`|Set PostCSS Stringifier| |[`config`](#config)|`{Object}`|`undefined`|Set `postcss.config.js` config path && `ctx`| |[`plugins`](#plugins)|`{Array\|Function}`|`[]`|Set PostCSS Plugins| |[`sourceMap`](#sourcemap)|`{String\|Boolean}`|`false`|Enable Source Maps| ### `Exec` If you use JS styles without the [`postcss-js`][postcss-js] parser, add the `exec` option. **`webpack.config.js`** ```js { test: /\.style.js$/, use: [ 'style-loader', { loader: 'css-loader', options: { importLoaders: 1 } }, { loader: 'postcss-loader', options: { parser: 'sugarss', exec: true } } ] } ``` ### `Config` |Name|Type|Default|Description| |:--:|:--:|:-----:|:----------| |[`path`](#path)|`{String}`|`undefined`|PostCSS Config Directory| |[`context`](#context)|`{Object}`|`undefined`|PostCSS Config Context| #### `Path` You can manually specify the path to search for your config (`postcss.config.js`) with the `config.path` option. This is needed if you store your config in a separate e.g `./config || ./.config` folder. > ⚠️ Otherwise it is **unnecessary** to set this option and is **not** recommended > ⚠️ Note that you **can't** use a **filename** other than the [supported config formats] (e.g `.postcssrc.js`, `postcss.config.js`), this option only allows you to manually specify the **directory** where config lookup should **start** from **`webpack.config.js`** ```js { loader: 'postcss-loader', options: { config: { path: 'path/to/.config/' ✅ path: 'path/to/.config/css.config.js' ❌ } } } ``` [supported config formats]: https://github.com/michael-ciniawsky/postcss-load-config#usage #### `Context (ctx)` |Name|Type|Default|Description| |:--:|:--:|:-----:|:----------| |`env`|`{String}`|`'development'`|`process.env.NODE_ENV`| |`file`|`{Object}`|`loader.resourcePath`|`extname`, `dirname`, `basename`| |`options`|`{Object}`|`{}`|Options| `postcss-loader` exposes context `ctx` to the config file, making your `postcss.config.js` dynamic, so can use it to do some real magic ✨ **`postcss.config.js`** ```js module.exports = ({ file, options, env }) => ({ parser: file.extname === '.sss' ? 'sugarss' : false, plugins: { 'postcss-import': { root: file.dirname }, 'postcss-preset-env': options['postcss-preset-env'] ? options['postcss-preset-env'] : false, 'cssnano': env === 'production' ? options.cssnano : false } }) ``` **`webpack.config.js`** ```js { loader: 'postcss-loader', options: { config: { ctx: { 'postcss-preset-env': {...options}, cssnano: {...options}, } } } } ``` ### `Plugins` **`webpack.config.js`** ```js { loader: 'postcss-loader', options: { ident: 'postcss', plugins: (loader) => [ require('postcss-import')({ root: loader.resourcePath }), require('postcss-preset-env')(), require('cssnano')() ] } } ``` > ⚠️ webpack requires an identifier (`ident`) in `options` when `{Function}/require` is used (Complex Options). The `ident` can be freely named as long as it is unique. It's recommended to name it (`ident: 'postcss'`) ### `Syntaxes` |Name|Type|Default|Description| |:--:|:--:|:-----:|:----------| |[`parser`](#parser)|`{String\|Function}`|`undefined`|Custom PostCSS Parser| |[`syntax`](#syntax)|`{String\|Function}`|`undefined`|Custom PostCSS Syntax| |[`stringifier`](#stringifier)|`{String\|Function}`|`undefined`|Custom PostCSS Stringifier| #### `Parser` **`webpack.config.js`** ```js { test: /\.sss$/, use: [ ..., { loader: 'postcss-loader', options: { parser: 'sugarss' } } ] } ``` #### `Syntax` **`webpack.config.js`** ```js { test: /\.css$/, use: [ ..., { loader: 'postcss-loader', options: { syntax: 'sugarss' } } ] } ``` #### `Stringifier` **`webpack.config.js`** ```js { test: /\.css$/, use: [ ..., { loader: 'postcss-loader', options: { stringifier: 'midas' } } ] } ``` ### `SourceMap` Enables source map support, `postcss-loader` will use the previous source map given by other loaders and update it accordingly, if no previous loader is applied before `postcss-loader`, the loader will generate a source map for you. **`webpack.config.js`** ```js { test: /\.css/, use: [ { loader: 'style-loader', options: { sourceMap: true } }, { loader: 'css-loader', options: { sourceMap: true } }, { loader: 'postcss-loader', options: { sourceMap: true } }, { loader: 'sass-loader', options: { sourceMap: true } } ] } ``` #### `'inline'` You can set the `sourceMap: 'inline'` option to inline the source map within the CSS directly as an annotation comment. **`webpack.config.js`** ```js { loader: 'postcss-loader', options: { sourceMap: 'inline' } } ``` ```css .class { color: red; } /*# sourceMappingURL=data:application/json;base64, ... */ ``` <h2 align="center">Examples</h2> ###