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.
Twitter account: @postcss.
VK.com page: postcss.
Support / Discussion: Gitter.
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 CSSpostcss-modules and react-css-modules automatically isolatepostcss-autoreset is an alternative to using a global resetpostcss-initial adds all: initial support, which resetscq-prolyfill adds container query support, allowing styles that respondautoprefixer adds vendor prefixes, using data from Can I Use.postcss-cssnext allows you to use future CSS features todayautoprefixer).postcss-image-set-polyfill emulates image-set function logic for all browsersprecss contains plugins for Sass-like features, like variables, nesting,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 CSSstylelint 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-scss allows you to work with SCSSpostcss-sass allows you to work with Sasspostcss-less allows you to work with Lesspostcss-less-engine allows you to work with Lesspostcss-js allows you to write styles in JS or transformpostcss-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: {
loaders: [
{
test: /\.css$/,
exclude: /node_modules/,
use: [
{
loader: 'style-loader',
},
{
loader: 'css-loader',
options: {
sourceMap: true,
importLoaders: 1,
}
},
{
loader: 'postcss-loader',
options: {
sourceMap: 'inline',
}
}
]
}
]
}
}
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-postcssfly-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);
if ( result.map ) fs.writeFile('dest/app.css.map', result.map);
});
});
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).If you want to run PostCSS in Node.js 0.10, add the Promise polyfill:
require('es6-promise').polyfill();
var postcss = require('postcss');
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.