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Showing content from https://github.com/egoist/rollup-plugin-postcss below:

egoist/rollup-plugin-postcss: Seamless integration between Rollup and PostCSS.

Seamless integration between Rollup and PostCSS.

yarn add postcss rollup-plugin-postcss --dev

v2.0 support rollup v1 or above, but it prints deprecated warning from rollup v2.

Breaking change: v3.0 only support rollup v2, and the extract path based on bundle root the location of the generated file outside the bundle directory not allowed in rollup v2.

// rollup.config.js
import postcss from 'rollup-plugin-postcss'

export default {
  plugins: [
    postcss({
      plugins: []
    })
  ]
}

Then you can use CSS files:

Note that the generated CSS will be injected to <head> by default, and the CSS string is also available as default export unless extract: true:

// Inject to `<head>` and also available as `style`
import style from './style.css'

It will also automatically use local PostCSS config files.

// for v2
postcss({
  extract: true,
  // Or with custom file name, it will generate file relative to bundle.js in v3
  extract: 'dist/my-custom-file-name.css'
})

// for v3
import path from 'path'
postcss({
  extract: true,
  // Or with custom file name
  extract: path.resolve('dist/my-custom-file-name.css')
})

postcss({
  modules: true,
  // Or with custom options for `postcss-modules`
  modules: {}
})

Install corresponding dependency:

For Sass install node-sass: yarn add node-sass --dev
For Stylus Install stylus: yarn add stylus --dev
For Less Install less: yarn add less --dev

That's it, you can now import .styl .scss .sass .less files in your library.

For Sass/Scss Only.

Similar to how webpack's sass-loader works, you can prepend the path with ~ to tell this plugin to resolve in node_modules:

@import "~bootstrap/dist/css/bootstrap";

Type: string[]
Default: ['.css', '.sss', '.pcss']

This plugin will process files ending with these extensions and the extensions supported by custom loaders.

Type: Array

PostCSS Plugins.

Type: boolean object function(cssVariableName, fileId): string

Default: true

Inject CSS into <head>, it's always false when extract: true.

You can also use it as options for style-inject.

It can also be a function , returning a string which is js code.

Type: boolean string
Default: false

Extract CSS to the same location where JS file is generated but with .css extension.

You can also set it to an absolute path.

Type: boolean object
Default: false

Enable CSS modules or set options for postcss-modules.

Type: boolean
Default: true

Automatically enable CSS modules for .module.css .module.sss .module.scss .module.sass .module.styl .module.stylus .module.less files.

Type: boolean function
Default: false

Use named exports alongside default export.

You can supply a function to control how exported named is generated:

namedExports(name) {
  // Maybe you simply want to convert dash to underscore
  return name.replace(/-/g, '_')
}

If you set it to true, the following will happen when importing specific classNames:

dashed class names will be transformed by replacing all the dashes to $ sign wrapped underlines, eg. -- => $__$
js protected names used as your style class names, will be transformed by wrapping the names between $ signs, eg. switch => $switch$

All transformed names will be logged in your terminal like:

Exported "new" as "$new$" in test/fixtures/named-exports/style.css

The original will not be removed, it's still available on default export:

import style, { class$_$name, class$__$name, $switch$ } from './style.css'
console.log(style['class-name'] === class$_$name) // true
console.log(style['class--name'] === class$__$name) // true
console.log(style['switch'] === $switch$) // true

Type: boolean object
Default: false

Minimize CSS, boolean or options for cssnano.

Type: boolean "inline"

Enable sourceMap.

Type: string function

PostCSS parser, like sugarss.

Type: string function

PostCSS Stringifier.

Type: string function

PostCSS Syntax.

Type: boolean

Enable PostCSS Parser support in CSS-in-JS.

Type: boolean object
Default: true

Load PostCSS config file.

Type: string

The path to config file, so that we can skip searching.

Type: object

ctx argument for PostCSS config file.

Note: Every key you pass to config.ctx will be available under options inside the postcss config.

// rollup.config.js
postcss({
  config: {
    ctx: {
      foo: 'bar'
    }
  }
})

// postcss.config.js
module.exports = context => {
  console.log(context.options.foo) // 'bar'

  return {}
}

Type: string

Destination CSS filename hint that could be used by PostCSS plugins, for example, to properly resolve path, rebase and copy assets.

Type: name[] [name, options][] { sass: options, stylus: options, less: options }

Default: ['sass', 'stylus', 'less']

Use a loader, currently built-in loaders are:

sass (Support .scss and .sass)
stylus (Support .styl and .stylus)
less (Support .less)

They are executed from right to left.

If you pass the object, then its property sass, stylus and less will be pass in the corresponding loader.

Type: Loader[]

An array of custom loaders, check out our sass-loader as example.

interface Loader {
  name: string,
  test: RegExp,
  process: (this: Context, input: Payload) => Promise<Payload> | Payload
}

interface Context {
  /** Loader options */
  options: any
  /** Sourcemap */
  sourceMap: any
  /** Resource path */
  id: string
  /** Files to watch */
  dependencies: Set<string>
  /** Emit a waring */
  warn: PluginContext.warn
  /** https://rollupjs.org/guide/en#plugin-context */
  plugin: PluginContext
}

interface Payload {
  /** File content */
  code: string
  /** Sourcemap */
  map?: string | SourceMap
}

Type: id => void

A function to be invoked when an import for CSS file is detected.

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