rollup-plugin-postcss
Advanced tools
rollup-plugin-postcss is a Rollup plugin that allows you to import and process CSS files with PostCSS. It supports various PostCSS plugins, CSS modules, and can even extract CSS into separate files.
Importing CSS
This feature allows you to import CSS files directly into your JavaScript or TypeScript files. The imported styles can then be used within your components.
import styles from './styles.css';Using PostCSS Plugins
This feature allows you to use PostCSS plugins like autoprefixer to process your CSS. The example demonstrates how to configure the plugin to use autoprefixer.
import postcss from 'rollup-plugin-postcss';
import autoprefixer from 'autoprefixer';
export default {
input: 'src/index.js',
output: {
file: 'dist/bundle.js',
format: 'cjs'
},
plugins: [
postcss({
plugins: [
autoprefixer()
]
})
]
};Extracting CSS
This feature allows you to extract CSS into a separate file instead of including it in the JavaScript bundle. The example shows how to configure the plugin to extract CSS.
import postcss from 'rollup-plugin-postcss';
export default {
input: 'src/index.js',
output: {
file: 'dist/bundle.js',
format: 'cjs'
},
plugins: [
postcss({
extract: true
})
]
};CSS Modules
This feature allows you to use CSS Modules, which scope CSS by automatically creating unique class names. The example demonstrates how to enable CSS Modules in the plugin configuration.
import postcss from 'rollup-plugin-postcss';
export default {
input: 'src/index.js',
output: {
file: 'dist/bundle.js',
format: 'cjs'
},
plugins: [
postcss({
modules: true
})
]
};rollup-plugin-css-only is a Rollup plugin that allows you to import CSS files and extract them into a separate file. Unlike rollup-plugin-postcss, it does not support PostCSS plugins or CSS Modules.
rollup-plugin-sass is a Rollup plugin that allows you to import and compile Sass/SCSS files. It supports extracting CSS into separate files and can be used in conjunction with PostCSS plugins. However, it is specifically designed for Sass/SCSS rather than general CSS processing.
rollup-plugin-styles is a versatile Rollup plugin that supports importing and processing CSS, Sass, Less, and Stylus files. It also supports PostCSS plugins and CSS Modules, making it a more comprehensive solution compared to rollup-plugin-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:
import './style.css'
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:
Sass install node-sass: yarn add node-sass --devStylus Install stylus: yarn add stylus --devLess Install less: yarn add less --devThat'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:
$ sign wrapped underlines, eg. -- => $__$$ 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.
MIT © EGOIST
FAQs
Seamless integration between Rollup and PostCSS
We found that rollup-plugin-postcss demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 5 open source maintainers collaborating on the project.
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