| 1 | <div align="center">
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| 2 | <img
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| 3 | width="180"
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| 4 | height="180"
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| 5 | hspace="10"
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| 6 | alt="PostCSS Logo"
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| 7 | src="https://api.postcss.org/logo.svg">
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| 8 | <a href="https://github.com/webpack/webpack">
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| 9 | <img
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| 10 | width="200"
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| 11 | height="200"
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| 12 | hspace="10"
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| 13 | src="https://cdn.rawgit.com/webpack/media/e7485eb2/logo/icon.svg">
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| 14 | </a>
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| 15 | <div align="center">
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| 16 | <a href="https://evilmartians.com/?utm_source=postcss">
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| 17 | <img
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| 18 | src="https://evilmartians.com/badges/sponsored-by-evil-martians.svg"
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| 19 | alt="Sponsored by Evil Martians"
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| 20 | width="236"
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| 21 | height="54"
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| 22 | vspace="10">
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| 23 | </a>
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| 24 | </div>
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| 25 | </div>
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| 26 |
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| 27 | [![npm][npm]][npm-url]
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| 28 | [![node][node]][node-url]
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| 29 | [![deps][deps]][deps-url]
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| 30 | [![tests][tests]][tests-url]
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| 31 | [![coverage][cover]][cover-url]
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| 32 | [![size][size]][size-url]
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| 33 |
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| 34 | Webpack chat: [![chat][chat]][chat-url]
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| 35 |
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| 36 | PostCSS chat: [![chat-postcss][chat-postcss]][chat-postcss-url]
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| 37 |
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| 38 | # postcss-loader
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| 39 |
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| 40 | Loader to process CSS with [`PostCSS`](https://github.com/postcss/postcss).
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| 41 |
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| 42 | ## Getting Started
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| 43 |
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| 44 | You need webpack v5 to use the latest version. For Webpack v4, you have to install postcss-loader v4.
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| 45 |
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| 46 | To begin, you'll need to install `postcss-loader` and `postcss`:
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| 47 |
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| 48 | ```console
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| 49 | npm install --save-dev postcss-loader postcss
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| 50 | ```
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| 51 |
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| 52 | Then add the plugin to your `webpack` config. For example:
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| 53 |
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| 54 | **file.js**
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| 55 |
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| 56 | ```js
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| 57 | import css from "file.css";
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| 58 | ```
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| 59 |
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| 60 | **webpack.config.js**
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| 61 |
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| 62 | ```js
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| 63 | module.exports = {
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| 64 | module: {
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| 65 | rules: [
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| 66 | {
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| 67 | test: /\.css$/i,
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| 68 | use: [
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| 69 | "style-loader",
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| 70 | "css-loader",
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| 71 | {
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| 72 | loader: "postcss-loader",
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| 73 | options: {
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| 74 | postcssOptions: {
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| 75 | plugins: [
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| 76 | [
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| 77 | "postcss-preset-env",
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| 78 | {
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| 79 | // Options
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| 80 | },
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| 81 | ],
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| 82 | ],
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| 83 | },
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| 84 | },
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| 85 | },
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| 86 | ],
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| 87 | },
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| 88 | ],
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| 89 | },
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| 90 | };
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| 91 | ```
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| 92 |
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| 93 | Alternative use with [config files](#config):
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| 94 |
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| 95 | **postcss.config.js**
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| 96 |
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| 97 | ```js
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| 98 | module.exports = {
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| 99 | plugins: [
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| 100 | [
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| 101 | "postcss-preset-env",
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| 102 | {
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| 103 | // Options
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| 104 | },
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| 105 | ],
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| 106 | ],
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| 107 | };
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| 108 | ```
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| 109 |
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| 110 | The loader **automatically** searches for configuration files.
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| 111 |
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| 112 | **webpack.config.js**
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| 113 |
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| 114 | ```js
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| 115 | module.exports = {
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| 116 | module: {
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| 117 | rules: [
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| 118 | {
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| 119 | test: /\.css$/i,
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| 120 | use: ["style-loader", "css-loader", "postcss-loader"],
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| 121 | },
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| 122 | ],
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| 123 | },
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| 124 | };
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| 125 | ```
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| 126 |
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| 127 | And run `webpack` via your preferred method.
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| 128 |
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| 129 | ## Options
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| 130 |
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| 131 | | Name | Type | Default | Description |
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| 132 | | :---------------------------------: | :------------------: | :-----------------------------------: | :------------------------------------------- |
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| 133 | | [`execute`](#execute) | `{Boolean}` | `undefined` | Enable PostCSS Parser support in `CSS-in-JS` |
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| 134 | | [`postcssOptions`](#postcssOptions) | `{Object\|Function}` | `defaults values for Postcss.process` | Set `PostCSS` options and plugins |
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| 135 | | [`sourceMap`](#sourcemap) | `{Boolean}` | `compiler.devtool` | Enables/Disables generation of source maps |
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| 136 | | [`implementation`](#implementation) | `{Function\|String}` | `postcss` | Setup PostCSS implementation to use |
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| 137 |
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| 138 | ### `execute`
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| 139 |
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| 140 | Type: `Boolean`
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| 141 | Default: `undefined`
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| 142 |
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| 143 | If you use JS styles the [`postcss-js`](https://github.com/postcss/postcss-js) parser, add the `execute` option.
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| 144 |
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| 145 | **webpack.config.js**
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| 146 |
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| 147 | ```js
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| 148 | module.exports = {
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| 149 | module: {
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| 150 | rules: [
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| 151 | {
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| 152 | test: /\.style.js$/,
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| 153 | use: [
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| 154 | "style-loader",
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| 155 | {
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| 156 | loader: "css-loader",
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| 157 | },
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| 158 | {
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| 159 | loader: "postcss-loader",
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| 160 | options: {
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| 161 | postcssOptions: {
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| 162 | parser: "postcss-js",
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| 163 | },
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| 164 | execute: true,
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| 165 | },
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| 166 | },
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| 167 | ],
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| 168 | },
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| 169 | ],
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| 170 | },
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| 171 | };
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| 172 | ```
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| 173 |
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| 174 | ### `postcssOptions`
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| 175 |
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| 176 | Type: `Object|Function`
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| 177 | Default: `undefined`
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| 178 |
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| 179 | Allows to set [`PostCSS options`](https://postcss.org/api/#processoptions) and plugins.
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| 180 |
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| 181 | All `PostCSS` options are supported.
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| 182 | There is the special `config` option for config files. How it works and how it can be configured is described below.
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| 183 |
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| 184 | We recommend do not specify `from`, `to` and `map` options, because this can lead to wrong path in source maps.
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| 185 | If you need source maps please use the [`sourcemap`](#sourcemap) option.
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| 186 |
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| 187 | #### `Object`
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| 188 |
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| 189 | Setup `plugins`:
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| 190 |
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| 191 | **webpack.config.js** (**recommended**)
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| 192 |
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| 193 | ```js
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| 194 | const myOtherPostcssPlugin = require("postcss-my-plugin");
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| 195 |
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| 196 | module.exports = {
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| 197 | module: {
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| 198 | rules: [
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| 199 | {
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| 200 | test: /\.sss$/i,
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| 201 | loader: "postcss-loader",
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| 202 | options: {
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| 203 | postcssOptions: {
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| 204 | plugins: [
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| 205 | "postcss-import",
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| 206 | ["postcss-short", { prefix: "x" }],
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| 207 | require.resolve("my-postcss-plugin"),
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| 208 | myOtherPostcssPlugin({ myOption: true }),
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| 209 | // Deprecated and will be removed in the next major release
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| 210 | { "postcss-nested": { preserveEmpty: true } },
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| 211 | ],
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| 212 | },
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| 213 | },
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| 214 | },
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| 215 | ],
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| 216 | },
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| 217 | };
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| 218 | ```
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| 219 |
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| 220 | **webpack.config.js** (**deprecated**, will be removed in the next major release)
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| 221 |
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| 222 | ```js
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| 223 | module.exports = {
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| 224 | module: {
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| 225 | rules: [
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| 226 | {
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| 227 | test: /\.sss$/i,
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| 228 | loader: "postcss-loader",
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| 229 | options: {
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| 230 | postcssOptions: {
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| 231 | plugins: {
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| 232 | "postcss-import": {},
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| 233 | "postcss-short": { prefix: "x" },
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| 234 | },
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| 235 | },
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| 236 | },
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| 237 | },
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| 238 | ],
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| 239 | },
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| 240 | };
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| 241 | ```
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| 242 |
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| 243 | Setup `syntax`:
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| 244 |
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| 245 | **webpack.config.js**
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| 246 |
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| 247 | ```js
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| 248 | module.exports = {
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| 249 | module: {
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| 250 | rules: [
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| 251 | {
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| 252 | test: /\.sss$/i,
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| 253 | loader: "postcss-loader",
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| 254 | options: {
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| 255 | postcssOptions: {
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| 256 | // Can be `String`
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| 257 | syntax: "sugarss",
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| 258 | // Can be `Object`
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| 259 | syntax: require("sugarss"),
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| 260 | },
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| 261 | },
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| 262 | },
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| 263 | ],
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| 264 | },
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| 265 | };
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| 266 | ```
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| 267 |
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| 268 | Setup `parser`:
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| 269 |
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| 270 | **webpack.config.js**
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| 271 |
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| 272 | ```js
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| 273 | module.exports = {
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| 274 | module: {
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| 275 | rules: [
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| 276 | {
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| 277 | test: /\.sss$/i,
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| 278 | loader: "postcss-loader",
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| 279 | options: {
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| 280 | postcssOptions: {
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| 281 | // Can be `String`
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| 282 | parser: "sugarss",
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| 283 | // Can be `Object`
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| 284 | parser: require("sugarss"),
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| 285 | // Can be `Function`
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| 286 | parser: require("sugarss").parse,
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| 287 | },
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| 288 | },
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| 289 | },
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| 290 | ],
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| 291 | },
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| 292 | };
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| 293 | ```
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| 294 |
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| 295 | Setup `stringifier`:
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| 296 |
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| 297 | **webpack.config.js**
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| 298 |
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| 299 | ```js
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| 300 | const Midas = require("midas");
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| 301 | const midas = new Midas();
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| 302 |
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| 303 | module.exports = {
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| 304 | module: {
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| 305 | rules: [
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| 306 | {
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| 307 | test: /\.sss$/i,
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| 308 | loader: "postcss-loader",
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| 309 | options: {
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| 310 | postcssOptions: {
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| 311 | // Can be `String`
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| 312 | stringifier: "sugarss",
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| 313 | // Can be `Object`
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| 314 | stringifier: require("sugarss"),
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| 315 | // Can be `Function`
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| 316 | stringifier: midas.stringifier,
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| 317 | },
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| 318 | },
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| 319 | },
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| 320 | ],
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| 321 | },
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| 322 | };
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| 323 | ```
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| 324 |
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| 325 | #### `Function`
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| 326 |
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| 327 | **webpack.config.js**
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| 328 |
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| 329 | ```js
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| 330 | module.exports = {
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| 331 | module: {
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| 332 | rules: [
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| 333 | {
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| 334 | test: /\.(css|sss)$/i,
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| 335 | loader: "postcss-loader",
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| 336 | options: {
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| 337 | postcssOptions: (loaderContext) => {
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| 338 | if (/\.sss$/.test(loaderContext.resourcePath)) {
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| 339 | return {
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| 340 | parser: "sugarss",
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| 341 | plugins: [
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| 342 | ["postcss-short", { prefix: "x" }],
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| 343 | "postcss-preset-env",
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| 344 | ],
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| 345 | };
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| 346 | }
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| 347 |
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| 348 | return {
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| 349 | plugins: [
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| 350 | ["postcss-short", { prefix: "x" }],
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| 351 | "postcss-preset-env",
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| 352 | ],
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| 353 | };
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| 354 | },
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| 355 | },
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| 356 | },
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| 357 | ],
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| 358 | },
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| 359 | };
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| 360 | ```
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| 361 |
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| 362 | #### `config`
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| 363 |
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| 364 | Type: `Boolean|String`
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| 365 | Default: `undefined`
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| 366 |
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| 367 | Allows to set options using config files.
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| 368 | Options specified in the config file are combined with options passed to the loader, the loader options overwrite options from config.
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| 369 |
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| 370 | ##### Config Files
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| 371 |
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| 372 | The loader will search up the directory tree for configuration in the following places:
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| 373 |
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| 374 | - a `postcss` property in `package.json`
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| 375 | - a `.postcssrc` file in JSON or YAML format
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| 376 | - a `.postcssrc.json`, `.postcssrc.yaml`, `.postcssrc.yml`, `.postcssrc.js`, or `.postcssrc.cjs` file
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| 377 | - a `postcss.config.js` or `postcss.config.cjs` CommonJS module exporting an object (**recommended**)
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| 378 |
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| 379 | ##### Examples of Config Files
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| 380 |
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| 381 | Using `Object` notation:
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| 382 |
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| 383 | **postcss.config.js** (**recommend**)
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| 384 |
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| 385 | ```js
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| 386 | module.exports = {
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| 387 | // You can specify any options from https://postcss.org/api/#processoptions here
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| 388 | // parser: 'sugarss',
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| 389 | plugins: [
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| 390 | // Plugins for PostCSS
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| 391 | ["postcss-short", { prefix: "x" }],
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| 392 | "postcss-preset-env",
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| 393 | ],
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| 394 | };
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| 395 | ```
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| 396 |
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| 397 | Using `Function` notation:
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| 398 |
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| 399 | **postcss.config.js** (**recommend**)
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| 400 |
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| 401 | ```js
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| 402 | module.exports = (api) => {
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| 403 | // `api.file` - path to the file
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| 404 | // `api.mode` - `mode` value of webpack, please read https://webpack.js.org/configuration/mode/
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| 405 | // `api.webpackLoaderContext` - loader context for complex use cases
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| 406 | // `api.env` - alias `api.mode` for compatibility with `postcss-cli`
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| 407 | // `api.options` - the `postcssOptions` options
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| 408 |
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| 409 | if (/\.sss$/.test(api.file)) {
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| 410 | return {
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| 411 | // You can specify any options from https://postcss.org/api/#processoptions here
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| 412 | parser: "sugarss",
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| 413 | plugins: [
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| 414 | // Plugins for PostCSS
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| 415 | ["postcss-short", { prefix: "x" }],
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| 416 | "postcss-preset-env",
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| 417 | ],
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| 418 | };
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| 419 | }
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| 420 |
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| 421 | return {
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| 422 | // You can specify any options from https://postcss.org/api/#processoptions here
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| 423 | plugins: [
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| 424 | // Plugins for PostCSS
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| 425 | ["postcss-short", { prefix: "x" }],
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| 426 | "postcss-preset-env",
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| 427 | ],
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| 428 | };
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| 429 | };
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| 430 | ```
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| 431 |
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| 432 | **postcss.config.js** (**deprecated**, will be removed in the next major release)
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| 433 |
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| 434 | ```js
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| 435 | module.exports = {
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| 436 | // You can specify any options from https://postcss.org/api/#processoptions here
|
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| 437 | // parser: 'sugarss',
|
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| 438 | plugins: {
|
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| 439 | // Plugins for PostCSS
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| 440 | "postcss-short": { prefix: "x" },
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| 441 | "postcss-preset-env": {},
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| 442 | },
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| 443 | };
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| 444 | ```
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| 445 |
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| 446 | ##### Config Cascade
|
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| 447 |
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| 448 | You can use different `postcss.config.js` files in different directories.
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| 449 | Config lookup starts from `path.dirname(file)` and walks the file tree upwards until a config file is found.
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| 450 |
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| 451 | ```
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| 452 | |– components
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| 453 | | |– component
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| 454 | | | |– index.js
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| 455 | | | |– index.png
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| 456 | | | |– style.css (1)
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| 457 | | | |– postcss.config.js (1)
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| 458 | | |– component
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| 459 | | | |– index.js
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| 460 | | | |– image.png
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| 461 | | | |– style.css (2)
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| 462 | |
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| 463 | |– postcss.config.js (1 && 2 (recommended))
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| 464 | |– webpack.config.js
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| 465 | |
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| 466 | |– package.json
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| 467 | ```
|
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| 468 |
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| 469 | After setting up your `postcss.config.js`, add `postcss-loader` to your `webpack.config.js`.
|
|---|
| 470 | You can use it standalone or in conjunction with `css-loader` (recommended).
|
|---|
| 471 |
|
|---|
| 472 | Use it **before** `css-loader` and `style-loader`, but **after** other preprocessor loaders like e.g `sass|less|stylus-loader`, if you use any (since [webpack loaders evaluate right to left/bottom to top](https://webpack.js.org/concepts/loaders/#configuration)).
|
|---|
| 473 |
|
|---|
| 474 | **webpack.config.js** (**recommended**)
|
|---|
| 475 |
|
|---|
| 476 | ```js
|
|---|
| 477 | module.exports = {
|
|---|
| 478 | module: {
|
|---|
| 479 | rules: [
|
|---|
| 480 | {
|
|---|
| 481 | test: /\.css$/,
|
|---|
| 482 | use: [
|
|---|
| 483 | "style-loader",
|
|---|
| 484 | {
|
|---|
| 485 | loader: "css-loader",
|
|---|
| 486 | options: {
|
|---|
| 487 | importLoaders: 1,
|
|---|
| 488 | },
|
|---|
| 489 | },
|
|---|
| 490 | "postcss-loader",
|
|---|
| 491 | ],
|
|---|
| 492 | },
|
|---|
| 493 | ],
|
|---|
| 494 | },
|
|---|
| 495 | };
|
|---|
| 496 | ```
|
|---|
| 497 |
|
|---|
| 498 | #### Boolean
|
|---|
| 499 |
|
|---|
| 500 | Enables/Disables autoloading config.
|
|---|
| 501 |
|
|---|
| 502 | **webpack.config.js**
|
|---|
| 503 |
|
|---|
| 504 | ```js
|
|---|
| 505 | module.exports = {
|
|---|
| 506 | module: {
|
|---|
| 507 | rules: [
|
|---|
| 508 | {
|
|---|
| 509 | test: /\.css$/i,
|
|---|
| 510 | loader: "postcss-loader",
|
|---|
| 511 | options: {
|
|---|
| 512 | postcssOptions: {
|
|---|
| 513 | config: false,
|
|---|
| 514 | },
|
|---|
| 515 | },
|
|---|
| 516 | },
|
|---|
| 517 | ],
|
|---|
| 518 | },
|
|---|
| 519 | };
|
|---|
| 520 | ```
|
|---|
| 521 |
|
|---|
| 522 | #### String
|
|---|
| 523 |
|
|---|
| 524 | Allows to specify the path to the config file.
|
|---|
| 525 |
|
|---|
| 526 | **webpack.config.js**
|
|---|
| 527 |
|
|---|
| 528 | ```js
|
|---|
| 529 | const path = require("path");
|
|---|
| 530 |
|
|---|
| 531 | module.exports = {
|
|---|
| 532 | module: {
|
|---|
| 533 | rules: [
|
|---|
| 534 | {
|
|---|
| 535 | test: /\.css$/i,
|
|---|
| 536 | loader: "postcss-loader",
|
|---|
| 537 | options: {
|
|---|
| 538 | postcssOptions: {
|
|---|
| 539 | config: path.resolve(__dirname, "custom.config.js"),
|
|---|
| 540 | },
|
|---|
| 541 | },
|
|---|
| 542 | },
|
|---|
| 543 | ],
|
|---|
| 544 | },
|
|---|
| 545 | };
|
|---|
| 546 | ```
|
|---|
| 547 |
|
|---|
| 548 | ### `sourceMap`
|
|---|
| 549 |
|
|---|
| 550 | Type: `Boolean`
|
|---|
| 551 | Default: depends on the `compiler.devtool` value
|
|---|
| 552 |
|
|---|
| 553 | By default generation of source maps depends on the [`devtool`](https://webpack.js.org/configuration/devtool/) option.
|
|---|
| 554 | All values enable source map generation except `eval` and `false` value.
|
|---|
| 555 |
|
|---|
| 556 | **webpack.config.js**
|
|---|
| 557 |
|
|---|
| 558 | ```js
|
|---|
| 559 | module.exports = {
|
|---|
| 560 | module: {
|
|---|
| 561 | rules: [
|
|---|
| 562 | {
|
|---|
| 563 | test: /\.css$/i,
|
|---|
| 564 | use: [
|
|---|
| 565 | { loader: "style-loader" },
|
|---|
| 566 | { loader: "css-loader", options: { sourceMap: true } },
|
|---|
| 567 | { loader: "postcss-loader", options: { sourceMap: true } },
|
|---|
| 568 | { loader: "sass-loader", options: { sourceMap: true } },
|
|---|
| 569 | ],
|
|---|
| 570 | },
|
|---|
| 571 | ],
|
|---|
| 572 | },
|
|---|
| 573 | };
|
|---|
| 574 | ```
|
|---|
| 575 |
|
|---|
| 576 | Alternative setup:
|
|---|
| 577 |
|
|---|
| 578 | **webpack.config.js**
|
|---|
| 579 |
|
|---|
| 580 | ```js
|
|---|
| 581 | module.exports = {
|
|---|
| 582 | devtool: "source-map",
|
|---|
| 583 | module: {
|
|---|
| 584 | rules: [
|
|---|
| 585 | {
|
|---|
| 586 | test: /\.css$/i,
|
|---|
| 587 | use: [
|
|---|
| 588 | { loader: "style-loader" },
|
|---|
| 589 | { loader: "css-loader" },
|
|---|
| 590 | { loader: "postcss-loader" },
|
|---|
| 591 | { loader: "sass-loader" },
|
|---|
| 592 | ],
|
|---|
| 593 | },
|
|---|
| 594 | ],
|
|---|
| 595 | },
|
|---|
| 596 | };
|
|---|
| 597 | ```
|
|---|
| 598 |
|
|---|
| 599 | ### `implementation`
|
|---|
| 600 |
|
|---|
| 601 | Type: `Function | String`
|
|---|
| 602 | Default: `postcss`
|
|---|
| 603 |
|
|---|
| 604 | The special `implementation` option determines which implementation of PostCSS to use. Overrides the locally installed `peerDependency` version of `postcss`.
|
|---|
| 605 |
|
|---|
| 606 | **This option is only really useful for downstream tooling authors to ease the PostCSS 7-to-8 transition.**
|
|---|
| 607 |
|
|---|
| 608 | #### Function
|
|---|
| 609 |
|
|---|
| 610 | **webpack.config.js**
|
|---|
| 611 |
|
|---|
| 612 | ```js
|
|---|
| 613 | module.exports = {
|
|---|
| 614 | module: {
|
|---|
| 615 | rules: [
|
|---|
| 616 | {
|
|---|
| 617 | test: /\.css$/i,
|
|---|
| 618 | use: [
|
|---|
| 619 | { loader: "style-loader" },
|
|---|
| 620 | { loader: "css-loader" },
|
|---|
| 621 | {
|
|---|
| 622 | loader: "postcss-loader",
|
|---|
| 623 | options: { implementation: require("postcss") },
|
|---|
| 624 | },
|
|---|
| 625 | { loader: "sass-loader" },
|
|---|
| 626 | ],
|
|---|
| 627 | },
|
|---|
| 628 | ],
|
|---|
| 629 | },
|
|---|
| 630 | };
|
|---|
| 631 | ```
|
|---|
| 632 |
|
|---|
| 633 | #### String
|
|---|
| 634 |
|
|---|
| 635 | **webpack.config.js**
|
|---|
| 636 |
|
|---|
| 637 | ```js
|
|---|
| 638 | module.exports = {
|
|---|
| 639 | module: {
|
|---|
| 640 | rules: [
|
|---|
| 641 | {
|
|---|
| 642 | test: /\.css$/i,
|
|---|
| 643 | use: [
|
|---|
| 644 | { loader: "style-loader" },
|
|---|
| 645 | { loader: "css-loader" },
|
|---|
| 646 | {
|
|---|
| 647 | loader: "postcss-loader",
|
|---|
| 648 | options: { implementation: require.resolve("postcss") },
|
|---|
| 649 | },
|
|---|
| 650 | { loader: "sass-loader" },
|
|---|
| 651 | ],
|
|---|
| 652 | },
|
|---|
| 653 | ],
|
|---|
| 654 | },
|
|---|
| 655 | };
|
|---|
| 656 | ```
|
|---|
| 657 |
|
|---|
| 658 | ## Examples
|
|---|
| 659 |
|
|---|
| 660 | ### SugarSS
|
|---|
| 661 |
|
|---|
| 662 | You'll need to install `sugarss`:
|
|---|
| 663 |
|
|---|
| 664 | ```console
|
|---|
| 665 | npm install --save-dev sugarss
|
|---|
| 666 | ```
|
|---|
| 667 |
|
|---|
| 668 | Using [`SugarSS`](https://github.com/postcss/sugarss) syntax.
|
|---|
| 669 |
|
|---|
| 670 | **webpack.config.js**
|
|---|
| 671 |
|
|---|
| 672 | ```js
|
|---|
| 673 | module.exports = {
|
|---|
| 674 | module: {
|
|---|
| 675 | rules: [
|
|---|
| 676 | {
|
|---|
| 677 | test: /\.sss$/i,
|
|---|
| 678 | use: [
|
|---|
| 679 | "style-loader",
|
|---|
| 680 | {
|
|---|
| 681 | loader: "css-loader",
|
|---|
| 682 | options: { importLoaders: 1 },
|
|---|
| 683 | },
|
|---|
| 684 | {
|
|---|
| 685 | loader: "postcss-loader",
|
|---|
| 686 | options: {
|
|---|
| 687 | postcssOptions: {
|
|---|
| 688 | parser: "sugarss",
|
|---|
| 689 | },
|
|---|
| 690 | },
|
|---|
| 691 | },
|
|---|
| 692 | ],
|
|---|
| 693 | },
|
|---|
| 694 | ],
|
|---|
| 695 | },
|
|---|
| 696 | };
|
|---|
| 697 | ```
|
|---|
| 698 |
|
|---|
| 699 | ### Autoprefixer
|
|---|
| 700 |
|
|---|
| 701 | You'll need to install `autoprefixer`:
|
|---|
| 702 |
|
|---|
| 703 | ```console
|
|---|
| 704 | npm install --save-dev autoprefixer
|
|---|
| 705 | ```
|
|---|
| 706 |
|
|---|
| 707 | Add vendor prefixes to CSS rules using [`autoprefixer`](https://github.com/postcss/autoprefixer).
|
|---|
| 708 |
|
|---|
| 709 | **webpack.config.js**
|
|---|
| 710 |
|
|---|
| 711 | ```js
|
|---|
| 712 | module.exports = {
|
|---|
| 713 | module: {
|
|---|
| 714 | rules: [
|
|---|
| 715 | {
|
|---|
| 716 | test: /\.css$/i,
|
|---|
| 717 | use: [
|
|---|
| 718 | "style-loader",
|
|---|
| 719 | {
|
|---|
| 720 | loader: "css-loader",
|
|---|
| 721 | options: { importLoaders: 1 },
|
|---|
| 722 | },
|
|---|
| 723 | {
|
|---|
| 724 | loader: "postcss-loader",
|
|---|
| 725 | options: {
|
|---|
| 726 | postcssOptions: {
|
|---|
| 727 | plugins: [
|
|---|
| 728 | [
|
|---|
| 729 | "autoprefixer",
|
|---|
| 730 | {
|
|---|
| 731 | // Options
|
|---|
| 732 | },
|
|---|
| 733 | ],
|
|---|
| 734 | ],
|
|---|
| 735 | },
|
|---|
| 736 | },
|
|---|
| 737 | },
|
|---|
| 738 | ],
|
|---|
| 739 | },
|
|---|
| 740 | ],
|
|---|
| 741 | },
|
|---|
| 742 | };
|
|---|
| 743 | ```
|
|---|
| 744 |
|
|---|
| 745 | > :warning: [`postcss-preset-env`](https://github.com/csstools/postcss-preset-env) includes [`autoprefixer`](https://github.com/postcss/autoprefixer), so adding it separately is not necessary if you already use the preset. More [information](https://github.com/csstools/postcss-preset-env#autoprefixer)
|
|---|
| 746 |
|
|---|
| 747 | ### PostCSS Preset Env
|
|---|
| 748 |
|
|---|
| 749 | You'll need to install `postcss-preset-env`:
|
|---|
| 750 |
|
|---|
| 751 | ```console
|
|---|
| 752 | npm install --save-dev postcss-preset-env
|
|---|
| 753 | ```
|
|---|
| 754 |
|
|---|
| 755 | **webpack.config.js**
|
|---|
| 756 |
|
|---|
| 757 | ```js
|
|---|
| 758 | module.exports = {
|
|---|
| 759 | module: {
|
|---|
| 760 | rules: [
|
|---|
| 761 | {
|
|---|
| 762 | test: /\.css$/i,
|
|---|
| 763 | use: [
|
|---|
| 764 | "style-loader",
|
|---|
| 765 | {
|
|---|
| 766 | loader: "css-loader",
|
|---|
| 767 | options: { importLoaders: 1 },
|
|---|
| 768 | },
|
|---|
| 769 | {
|
|---|
| 770 | loader: "postcss-loader",
|
|---|
| 771 | options: {
|
|---|
| 772 | postcssOptions: {
|
|---|
| 773 | plugins: [
|
|---|
| 774 | [
|
|---|
| 775 | "postcss-preset-env",
|
|---|
| 776 | {
|
|---|
| 777 | // Options
|
|---|
| 778 | },
|
|---|
| 779 | ],
|
|---|
| 780 | ],
|
|---|
| 781 | },
|
|---|
| 782 | },
|
|---|
| 783 | },
|
|---|
| 784 | ],
|
|---|
| 785 | },
|
|---|
| 786 | ],
|
|---|
| 787 | },
|
|---|
| 788 | };
|
|---|
| 789 | ```
|
|---|
| 790 |
|
|---|
| 791 | ### CSS Modules
|
|---|
| 792 |
|
|---|
| 793 | What is `CSS Modules`? Please [read](https://github.com/webpack-contrib/css-loader#modules).
|
|---|
| 794 |
|
|---|
| 795 | No additional options required on the `postcss-loader` side.
|
|---|
| 796 | To make them work properly, either add the `css-loader`’s `importLoaders` option.
|
|---|
| 797 |
|
|---|
| 798 | **webpack.config.js**
|
|---|
| 799 |
|
|---|
| 800 | ```js
|
|---|
| 801 | module.exports = {
|
|---|
| 802 | module: {
|
|---|
| 803 | rules: [
|
|---|
| 804 | {
|
|---|
| 805 | test: /\.css$/i,
|
|---|
| 806 | use: [
|
|---|
| 807 | "style-loader",
|
|---|
| 808 | {
|
|---|
| 809 | loader: "css-loader",
|
|---|
| 810 | options: {
|
|---|
| 811 | modules: true,
|
|---|
| 812 | importLoaders: 1,
|
|---|
| 813 | },
|
|---|
| 814 | },
|
|---|
| 815 | "postcss-loader",
|
|---|
| 816 | ],
|
|---|
| 817 | },
|
|---|
| 818 | ],
|
|---|
| 819 | },
|
|---|
| 820 | };
|
|---|
| 821 | ```
|
|---|
| 822 |
|
|---|
| 823 | ### CSS-in-JS and [`postcss-js`](https://github.com/postcss/postcss-js)
|
|---|
| 824 |
|
|---|
| 825 | You'll need to install `postcss-js`:
|
|---|
| 826 |
|
|---|
| 827 | ```console
|
|---|
| 828 | npm install --save-dev postcss-js
|
|---|
| 829 | ```
|
|---|
| 830 |
|
|---|
| 831 | If you want to process styles written in JavaScript, use the [`postcss-js`](https://github.com/postcss/postcss-js) parser.
|
|---|
| 832 |
|
|---|
| 833 | **webpack.config.js**
|
|---|
| 834 |
|
|---|
| 835 | ```js
|
|---|
| 836 | module.exports = {
|
|---|
| 837 | module: {
|
|---|
| 838 | rules: [
|
|---|
| 839 | {
|
|---|
| 840 | test: /\.style.js$/,
|
|---|
| 841 | use: [
|
|---|
| 842 | "style-loader",
|
|---|
| 843 | {
|
|---|
| 844 | loader: "css-loader",
|
|---|
| 845 | options: {
|
|---|
| 846 | importLoaders: 2,
|
|---|
| 847 | },
|
|---|
| 848 | },
|
|---|
| 849 | {
|
|---|
| 850 | loader: "postcss-loader",
|
|---|
| 851 | options: {
|
|---|
| 852 | postcssOptions: {
|
|---|
| 853 | parser: "postcss-js",
|
|---|
| 854 | },
|
|---|
| 855 | execute: true,
|
|---|
| 856 | },
|
|---|
| 857 | },
|
|---|
| 858 | "babel-loader",
|
|---|
| 859 | ],
|
|---|
| 860 | },
|
|---|
| 861 | ],
|
|---|
| 862 | },
|
|---|
| 863 | };
|
|---|
| 864 | ```
|
|---|
| 865 |
|
|---|
| 866 | As result you will be able to write styles in the following way
|
|---|
| 867 |
|
|---|
| 868 | ```js
|
|---|
| 869 | import colors from "./styles/colors";
|
|---|
| 870 |
|
|---|
| 871 | export default {
|
|---|
| 872 | ".menu": {
|
|---|
| 873 | color: colors.main,
|
|---|
| 874 | height: 25,
|
|---|
| 875 | "&_link": {
|
|---|
| 876 | color: "white",
|
|---|
| 877 | },
|
|---|
| 878 | },
|
|---|
| 879 | };
|
|---|
| 880 | ```
|
|---|
| 881 |
|
|---|
| 882 | > :warning: If you are using Babel you need to do the following in order for the setup to work
|
|---|
| 883 |
|
|---|
| 884 | > 1. Add [`babel-plugin-add-module-exports`](https://github.com/59naga/babel-plugin-add-module-exports) to your configuration.
|
|---|
| 885 | > 2. You need to have only one **default** export per style module.
|
|---|
| 886 |
|
|---|
| 887 | ### Extract CSS
|
|---|
| 888 |
|
|---|
| 889 | Using [`mini-css-extract-plugin`](https://github.com/webpack-contrib/mini-css-extract-plugin).
|
|---|
| 890 |
|
|---|
| 891 | **webpack.config.js**
|
|---|
| 892 |
|
|---|
| 893 | ```js
|
|---|
| 894 | const isProductionMode = process.env.NODE_ENV === "production";
|
|---|
| 895 |
|
|---|
| 896 | const MiniCssExtractPlugin = require("mini-css-extract-plugin");
|
|---|
| 897 |
|
|---|
| 898 | module.exports = {
|
|---|
| 899 | mode: isProductionMode ? "production" : "development",
|
|---|
| 900 | module: {
|
|---|
| 901 | rules: [
|
|---|
| 902 | {
|
|---|
| 903 | test: /\.css$/,
|
|---|
| 904 | use: [
|
|---|
| 905 | isProductionMode ? MiniCssExtractPlugin.loader : "style-loader",
|
|---|
| 906 | "css-loader",
|
|---|
| 907 | "postcss-loader",
|
|---|
| 908 | ],
|
|---|
| 909 | },
|
|---|
| 910 | ],
|
|---|
| 911 | },
|
|---|
| 912 | plugins: [
|
|---|
| 913 | new MiniCssExtractPlugin({
|
|---|
| 914 | filename: isProductionMode ? "[name].[contenthash].css" : "[name].css",
|
|---|
| 915 | }),
|
|---|
| 916 | ],
|
|---|
| 917 | };
|
|---|
| 918 | ```
|
|---|
| 919 |
|
|---|
| 920 | ### Emit assets
|
|---|
| 921 |
|
|---|
| 922 | To write a asset from PostCSS plugin to the webpack, need to add a message in `result.messages`.
|
|---|
| 923 |
|
|---|
| 924 | The message should contain the following fields:
|
|---|
| 925 |
|
|---|
| 926 | - `type` = `asset` - Message type (require, should be equal `asset`)
|
|---|
| 927 | - `file` - file name (require)
|
|---|
| 928 | - `content` - file content (require)
|
|---|
| 929 | - `sourceMap` - sourceMap
|
|---|
| 930 | - `info` - asset info
|
|---|
| 931 |
|
|---|
| 932 | **webpack.config.js**
|
|---|
| 933 |
|
|---|
| 934 | ```js
|
|---|
| 935 | const customPlugin = () => (css, result) => {
|
|---|
| 936 | result.messages.push({
|
|---|
| 937 | type: "asset",
|
|---|
| 938 | file: "sprite.svg",
|
|---|
| 939 | content: "<svg>...</svg>",
|
|---|
| 940 | });
|
|---|
| 941 | };
|
|---|
| 942 |
|
|---|
| 943 | const postcssPlugin = postcss.plugin("postcss-assets", customPlugin);
|
|---|
| 944 |
|
|---|
| 945 | module.exports = {
|
|---|
| 946 | module: {
|
|---|
| 947 | rules: [
|
|---|
| 948 | {
|
|---|
| 949 | test: /\.css$/i,
|
|---|
| 950 | use: [
|
|---|
| 951 | "style-loader",
|
|---|
| 952 | "css-loader",
|
|---|
| 953 | {
|
|---|
| 954 | loader: "postcss-loader",
|
|---|
| 955 | options: {
|
|---|
| 956 | postcssOptions: {
|
|---|
| 957 | plugins: [postcssPlugin()],
|
|---|
| 958 | },
|
|---|
| 959 | },
|
|---|
| 960 | },
|
|---|
| 961 | ],
|
|---|
| 962 | },
|
|---|
| 963 | ],
|
|---|
| 964 | },
|
|---|
| 965 | };
|
|---|
| 966 | ```
|
|---|
| 967 |
|
|---|
| 968 | ### Add dependencies, contextDependencies, buildDependencies, missingDependencies
|
|---|
| 969 |
|
|---|
| 970 | The dependencies are necessary for webpack to understand when it needs to run recompilation on the changed files.
|
|---|
| 971 |
|
|---|
| 972 | There are two way to add dependencies:
|
|---|
| 973 |
|
|---|
| 974 | 1. (Recommended). The plugin may emit messages in `result.messages`.
|
|---|
| 975 |
|
|---|
| 976 | The message should contain the following fields:
|
|---|
| 977 |
|
|---|
| 978 | - `type` = `dependency` - Message type (require, should be equal `dependency`, `context-dependency`, `build-dependency` or `missing-dependency`)
|
|---|
| 979 | - `file` - absolute file path (require)
|
|---|
| 980 |
|
|---|
| 981 | **webpack.config.js**
|
|---|
| 982 |
|
|---|
| 983 | ```js
|
|---|
| 984 | const path = require("path");
|
|---|
| 985 |
|
|---|
| 986 | const customPlugin = () => (css, result) => {
|
|---|
| 987 | result.messages.push({
|
|---|
| 988 | type: "dependency",
|
|---|
| 989 | file: path.resolve(__dirname, "path", "to", "file"),
|
|---|
| 990 | });
|
|---|
| 991 | };
|
|---|
| 992 |
|
|---|
| 993 | const postcssPlugin = postcss.plugin("postcss-assets", customPlugin);
|
|---|
| 994 |
|
|---|
| 995 | module.exports = {
|
|---|
| 996 | module: {
|
|---|
| 997 | rules: [
|
|---|
| 998 | {
|
|---|
| 999 | test: /\.css$/i,
|
|---|
| 1000 | use: [
|
|---|
| 1001 | "style-loader",
|
|---|
| 1002 | "css-loader",
|
|---|
| 1003 | {
|
|---|
| 1004 | loader: "postcss-loader",
|
|---|
| 1005 | options: {
|
|---|
| 1006 | postcssOptions: {
|
|---|
| 1007 | plugins: [postcssPlugin()],
|
|---|
| 1008 | },
|
|---|
| 1009 | },
|
|---|
| 1010 | },
|
|---|
| 1011 | ],
|
|---|
| 1012 | },
|
|---|
| 1013 | ],
|
|---|
| 1014 | },
|
|---|
| 1015 | };
|
|---|
| 1016 | ```
|
|---|
| 1017 |
|
|---|
| 1018 | 2. Pass `loaderContext` in plugin.
|
|---|
| 1019 |
|
|---|
| 1020 | **webpack.config.js**
|
|---|
| 1021 |
|
|---|
| 1022 | ```js
|
|---|
| 1023 | const path = require("path");
|
|---|
| 1024 |
|
|---|
| 1025 | module.exports = {
|
|---|
| 1026 | module: {
|
|---|
| 1027 | rules: [
|
|---|
| 1028 | {
|
|---|
| 1029 | test: /\.css$/i,
|
|---|
| 1030 | use: [
|
|---|
| 1031 | "style-loader",
|
|---|
| 1032 | "css-loader",
|
|---|
| 1033 | {
|
|---|
| 1034 | loader: "postcss-loader",
|
|---|
| 1035 | options: {
|
|---|
| 1036 | postcssOptions: {
|
|---|
| 1037 | config: path.resolve(__dirname, "path/to/postcss.config.js"),
|
|---|
| 1038 | },
|
|---|
| 1039 | },
|
|---|
| 1040 | },
|
|---|
| 1041 | ],
|
|---|
| 1042 | },
|
|---|
| 1043 | ],
|
|---|
| 1044 | },
|
|---|
| 1045 | };
|
|---|
| 1046 | ```
|
|---|
| 1047 |
|
|---|
| 1048 | **postcss.config.js**
|
|---|
| 1049 |
|
|---|
| 1050 | ```js
|
|---|
| 1051 | module.exports = (api) => ({
|
|---|
| 1052 | plugins: [
|
|---|
| 1053 | require("path/to/customPlugin")({
|
|---|
| 1054 | loaderContext: api.webpackLoaderContext,
|
|---|
| 1055 | }),
|
|---|
| 1056 | ],
|
|---|
| 1057 | });
|
|---|
| 1058 | ```
|
|---|
| 1059 |
|
|---|
| 1060 | **customPlugin.js**
|
|---|
| 1061 |
|
|---|
| 1062 | ```js
|
|---|
| 1063 | const path = require("path");
|
|---|
| 1064 |
|
|---|
| 1065 | const customPlugin = (loaderContext) => (css, result) => {
|
|---|
| 1066 | loaderContext.webpack.addDependency(
|
|---|
| 1067 | path.resolve(__dirname, "path", "to", "file")
|
|---|
| 1068 | );
|
|---|
| 1069 | };
|
|---|
| 1070 |
|
|---|
| 1071 | module.exports = postcss.plugin("postcss-assets", customPlugin);
|
|---|
| 1072 | ```
|
|---|
| 1073 |
|
|---|
| 1074 | ## Contributing
|
|---|
| 1075 |
|
|---|
| 1076 | Please take a moment to read our contributing guidelines if you haven't yet done so.
|
|---|
| 1077 |
|
|---|
| 1078 | [CONTRIBUTING](./.github/CONTRIBUTING.md)
|
|---|
| 1079 |
|
|---|
| 1080 | ## License
|
|---|
| 1081 |
|
|---|
| 1082 | [MIT](./LICENSE)
|
|---|
| 1083 |
|
|---|
| 1084 | [npm]: https://img.shields.io/npm/v/postcss-loader.svg
|
|---|
| 1085 | [npm-url]: https://npmjs.com/package/postcss-loader
|
|---|
| 1086 | [node]: https://img.shields.io/node/v/postcss-loader.svg
|
|---|
| 1087 | [node-url]: https://nodejs.org
|
|---|
| 1088 | [deps]: https://david-dm.org/webpack-contrib/postcss-loader.svg
|
|---|
| 1089 | [deps-url]: https://david-dm.org/webpack-contrib/postcss-loader
|
|---|
| 1090 | [tests]: https://github.com/webpack-contrib/postcss-loader/workflows/postcss-loader/badge.svg
|
|---|
| 1091 | [tests-url]: https://github.com/webpack-contrib/postcss-loader/actions
|
|---|
| 1092 | [cover]: https://codecov.io/gh/webpack-contrib/postcss-loader/branch/master/graph/badge.svg
|
|---|
| 1093 | [cover-url]: https://codecov.io/gh/webpack-contrib/postcss-loader
|
|---|
| 1094 | [chat]: https://badges.gitter.im/webpack/webpack.svg
|
|---|
| 1095 | [chat-url]: https://gitter.im/webpack/webpack
|
|---|
| 1096 | [chat-postcss]: https://badges.gitter.im/postcss/postcss.svg
|
|---|
| 1097 | [chat-postcss-url]: https://gitter.im/postcss/postcss
|
|---|
| 1098 | [size]: https://packagephobia.now.sh/badge?p=postcss-loader
|
|---|
| 1099 | [size-url]: https://packagephobia.now.sh/result?p=postcss-loader
|
|---|
