PostCSS is a tool for transforming CSS with JavaScript plugins. These plugins can lint your CSS, support variables and mixins, transpile future CSS syntax, inline images, and more.
Autoprefixing
Automatically adds vendor prefixes to CSS rules using values from Can I Use. It is recommended by Google and used in Twitter and Alibaba.
postcss([ require('autoprefixer') ]).process(css).then(result => { result.warnings().forEach(warn => { console.warn(warn.toString()); }); console.log(result.css); });CSS Variables
Transforms CSS Custom Properties (CSS variables) syntax into a static representation that can be understood by browsers that do not support this feature.
postcss([ require('postcss-custom-properties') ]).process(css).then(result => { console.log(result.css); });CSS Nesting
Allows you to nest one style rule inside another, following the CSS Nesting Module Level 3 specification.
postcss([ require('postcss-nesting') ]).process(css).then(result => { console.log(result.css); });Minification
A modular minifier, built on top of the PostCSS ecosystem. It is used to minimize CSS for better performance.
postcss([ require('cssnano') ]).process(css).then(result => { console.log(result.css); });Future CSS Syntax
Allows you to use future CSS features today. It polyfills CSS features that are not yet fully supported in browsers.
postcss([ require('postcss-preset-env') ]).process(css).then(result => { console.log(result.css); });Sass is a mature, stable, and powerful professional grade CSS extension language. It provides mechanisms such as variables, nesting, and mixins, which are not present in standard CSS. Unlike PostCSS, which uses JavaScript plugins, Sass has its own syntax and compiles to standard CSS.
Less is a backward-compatible language extension for CSS. It also allows variables, mixins, functions and many other techniques that allow you to make CSS more maintainable and extendable. Less is similar to Sass and differs from PostCSS in that it offers a different syntax and set of features.
Stylus is a preprocessor that serves as a more robust and feature-rich alternative to CSS. It supports both an indented syntax and regular CSS style. Stylus provides significant flexibility and feature parity with Sass and Less but with a different syntax and feature set compared to 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 insert vendor prefixes.
Support / Discussion: Gitter
Twitter account: @postcss
VK.com page: postcss
中文翻译: README-cn.md
For PostCSS commercial support (consulting, improving the front-end culture of your company, PostCSS plugins), contact Evil Martians at surrender@evilmartians.com.
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.
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.autoprefixer adds vendor prefixes, using data from Can I Use.postcss-preset-env allows you to use future CSS features today.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.postcss-assets inserts image dimensions and inlines files.postcss-sprites generates image sprites.font-magician generates all the @font-face rules needed in CSS.postcss-inline-svg allows you to inline SVG and customize its styles.postcss-write-svg allows you to write simple SVG directly in your CSS.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.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.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 <style> 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.More articles and videos you can find on awesome-postcss list.
You can start using PostCSS in just two steps:
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')
]
}
Use gulp-postcss and gulp-sourcemaps.
gulp.task('css', function () {
var postcss = require('gulp-postcss');
var 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/') );
});
To use PostCSS from your command-line interface or with npm scripts
there is postcss-cli.
postcss --use autoprefixer -c options.json -o main.css css/*.css
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.
var postcss = require('postcss-js');
var prefixer = postcss.sync([ require('autoprefixer') ]);
prefixer({ display: 'flex' }); //=> { display: ['-webkit-box', '-webkit-flex', '-ms-flexbox', 'flex'] }
grunt-postcssposthtml-postcsspoststylusrollup-plugin-postcsspostcss-brunchbroccoli-postcsspostcssenb-postcsstaskr-postcssstart-postcsspostcss-middlewareFor other environments, you can use the JS API:
const fs = require('fs');
const postcss = require('postcss');
const precss = require('precss');
const autoprefixer = require('autoprefixer');
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.
Most PostCSS runners accept two parameters:
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).language-postcss adds PostCSS and SugarSS highlight.source-preview-postcss previews your output CSS in a separate, live pane.Syntax-highlighting-for-PostCSS adds PostCSS highlight.postcss.vim adds PostCSS highlight.WebStorm 2016.3 has built-in PostCSS support.
6.0.23
FAQs
Tool for transforming styles with JS plugins
The npm package postcss receives a total of 47,000,090 weekly downloads. As such, postcss popularity was classified as popular.
We found that postcss demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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