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postcss
23.6K Stars 1.3K Forks MIT License 3.2K Commits 10 Opened issues

Description

Transforming styles with JS plugins

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PostCSS Gitter

Philosopher’s stone, logo of PostCSS

PostCSS is a tool for transforming styles with JS plugins. These plugins can lint your CSS, support variables and mixins, transpile future CSS syntax, inline images, and more.

PostCSS is used by industry leaders including Wikipedia, Twitter, Alibaba, and JetBrains. The Autoprefixer PostCSS plugin is one of the most popular CSS processors.

PostCSS takes a CSS file and provides an API to analyze and modify its rules (by transforming them into an Abstract Syntax Tree). This API can then be used by plugins to do a lot of useful things, e.g., to find errors automatically, or to insert vendor prefixes.

Support / Discussion: Gitter
Twitter account: @postcss
VK.com page: postcss
中文翻译:

docs/README-cn.md

For PostCSS commercial support (consulting, improving the front-end culture of your company, PostCSS plugins), contact Evil Martians at [email protected].

Sponsored by Evil Martians

Sponsorship

PostCSS needs your support. We are accepting donations at Open Collective.

Sponsored by Tailwind CSS

Plugins

Currently, PostCSS has more than 200 plugins. You can find all of the plugins in the plugins list or in the searchable catalog. Below is a list of our favorite plugins — the best demonstrations of what can be built on top of PostCSS.

If you have any new ideas, PostCSS plugin development is really easy.

Solve Global CSS Problem

  • postcss-use
    allows you to explicitly set PostCSS plugins within CSS and execute them only for the current file.
  • postcss-modules
    and
    react-css-modules
    automatically isolate selectors within components.
  • postcss-autoreset
    is an alternative to using a global reset that is better for isolatable components.
  • postcss-initial
    adds
    all: initial
    support, which resets all inherited styles.
  • cq-prolyfill
    adds container query support, allowing styles that respond to the width of the parent.

Use Future CSS, Today

Better CSS Readability

  • precss
    contains plugins for Sass-like features, like variables, nesting, and mixins.
  • postcss-sorting
    sorts the content of rules and at-rules.
  • postcss-utilities
    includes the most commonly used shortcuts and helpers.
  • short
    adds and extends numerous shorthand properties.

Images and Fonts

Linters

  • stylelint
    is a modular stylesheet linter.
  • stylefmt
    is a tool that automatically formats CSS according
    stylelint
    rules.
  • doiuse
    lints CSS for browser support, using data from Can I Use.
  • colorguard
    helps you maintain a consistent color palette.

Other

  • postcss-rtl
    combines both-directional (left-to-right and right-to-left) styles in one CSS file.
  • cssnano
    is a modular CSS minifier.
  • lost
    is a feature-rich
    calc()
    grid system.
  • rtlcss
    mirrors styles for right-to-left locales.

Syntaxes

PostCSS can transform styles in any syntax, not just CSS. If there is not yet support for your favorite syntax, you can write a parser and/or stringifier to extend PostCSS.

  • sugarss
    is a indent-based syntax like Sass or Stylus.
  • postcss-syntax
    switch syntax automatically by file extensions.
  • postcss-html
    parsing styles in
     tags of HTML-like files.
  • postcss-markdown
    parsing styles in code blocks of Markdown files.
  • postcss-jsx
    parsing CSS in template / object literals of source files.
  • postcss-styled
    parsing CSS in template literals of source files.
  • postcss-scss
    allows you to work with SCSS (but does not compile SCSS to CSS).
  • postcss-sass
    allows you to work with Sass (but does not compile Sass to CSS).
  • postcss-less
    allows you to work with Less (but does not compile LESS to CSS).
  • postcss-less-engine
    allows you to work with Less (and DOES compile LESS to CSS using true Less.js evaluation).
  • postcss-js
    allows you to write styles in JS or transform React Inline Styles, Radium or JSS.
  • postcss-safe-parser
    finds and fixes CSS syntax errors.
  • midas
    converts a CSS string to highlighted HTML.

Articles

More articles and videos you can find on awesome-postcss list.

Books

Usage

You can start using PostCSS in just two steps:

  1. Find and add PostCSS extensions for your build tool.
  2. Select plugins and add them to your PostCSS process.

CSS-in-JS

The best way to use PostCSS with CSS-in-JS is

astroturf
. Add its loader to your

webpack.config.js
:
module.exports = {
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ['style-loader', 'postcss-loader'],
      },
      {
        test: /\.jsx?$/,
        use: ['babel-loader', 'astroturf/loader'],
      }
    ]
  }
}

Then create

postcss.config.js
:
module.exports = {
  plugins: [
    require('autoprefixer'),
    require('postcss-nested')
  ]
}

Parcel

Parcel has built-in PostCSS support. It already uses Autoprefixer and cssnano. If you want to change plugins, create

postcss.config.js
in project’s root:
module.exports = {
  plugins: [
    require('autoprefixer'),
    require('postcss-nested')
  ]
}

Parcel will even automatically install these plugins for you.

Please, be aware of the several issues in Version 1. Notice, Version 2 may resolve the issues via issue #2157.

Webpack

Use

postcss-loader
in

webpack.config.js
:
module.exports = {
  module: {
    rules: [
      {
        test: /\.css$/,
        exclude: /node_modules/,
        use: [
          {
            loader: 'style-loader',
          },
          {
            loader: 'css-loader',
            options: {
              importLoaders: 1,
            }
          },
          {
            loader: 'postcss-loader'
          }
        ]
      }
    ]
  }
}

Then create

postcss.config.js
:
module.exports = {
  plugins: [
    require('precss'),
    require('autoprefixer')
  ]
}

Gulp

Use

gulp-postcss
and
gulp-sourcemaps
.

gulp.task('css', () => {
  const postcss    = require('gulp-postcss')
  const sourcemaps = require('gulp-sourcemaps')

return gulp.src('src/*/.css') .pipe( sourcemaps.init() ) .pipe( postcss([ require('precss'), require('autoprefixer') ]) ) .pipe( sourcemaps.write('.') ) .pipe( gulp.dest('build/') ) })

npm Scripts

To use PostCSS from your command-line interface or with npm scripts there is

postcss-cli
.

postcss --use autoprefixer -o main.css css/*.css

Browser

If you want to compile CSS string in browser (for instance, in live edit tools like CodePen), just use Browserify or webpack. They will pack PostCSS and plugins files into a single file.

To apply PostCSS plugins to React Inline Styles, JSS, Radium and other CSS-in-JS, you can use

postcss-js
and transforms style objects.

const postcss  = require('postcss-js')
const prefixer = postcss.sync([ require('autoprefixer') ])

prefixer({ display: 'flex' }) //=> { display: ['-webkit-box', '-webkit-flex', '-ms-flexbox', 'flex'] }

Deno

PostCSS also supports Deno:

import postcss from 'https://deno.land/x/postcss/mod.js'
import autoprefixer from 'https://dev.jspm.io/autoprefixer'

const result = await postcss([autoprefixer]).process(css)

Runners

JS API

For other environments, you can use the JS API:

const autoprefixer = require('autoprefixer')
const postcss = require('postcss')
const precss = require('precss')
const fs = require('fs')

fs.readFile('src/app.css', (err, css) => { postcss([precss, autoprefixer]) .process(css, { from: 'src/app.css', to: 'dest/app.css' }) .then(result => { fs.writeFile('dest/app.css', result.css, () => true) if ( result.map ) { fs.writeFile('dest/app.css.map', result.map, () => true) } }) })

Read the PostCSS API documentation for more details about the JS API.

All PostCSS runners should pass PostCSS Runner Guidelines.

Options

Most PostCSS runners accept two parameters:

  • An array of plugins.
  • An object of options.

Common options:

  • syntax
    : an object providing a syntax parser and a stringifier.
  • parser
    : a special syntax parser (for example, SCSS).
  • stringifier
    : a special syntax output generator (for example, Midas).
  • map
    : source map options.
  • from
    : the input file name (most runners set it automatically).
  • to
    : the output file name (most runners set it automatically).

Treat Warnings as Errors

In some situations it might be helpful to fail the build on any warning from PostCSS or one of its plugins. This guarantees that no warnings go unnoticed, and helps to avoid bugs. While there is no option to enable treating warnings as errors, it can easily be done by adding

postcss-fail-on-warn
plugin in the end of PostCSS plugins:
module.exports = {
  plugins: [
    require('autoprefixer'),
    require('postcss-fail-on-warn')
  ]
}

Editors & IDE Integration

VS Code

  • csstools.postcss
    adds support for PostCSS,
    postcss-preset-env
    and CSS Modules.

Atom

Sublime Text

Vim

WebStorm

WebStorm 2016.3 has built-in PostCSS support.

Security Contact

To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.

For Enterprise

Available as part of the Tidelift Subscription.

The maintainers of

postcss
and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use. Learn more.

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