⚠️ PostCSS Nesting was moved to @csstools/postcss-plugins. ⚠️
Read the announcement

PostCSS Nesting

PostCSS Nesting lets you nest style rules inside each other, following the CSS Nesting specification. If you want nested rules the same way Sass works you might want to use PostCSS Nested instead.

a, b {
  color: red;

  & c, & d {
    color: white;
  }
}

/* becomes */

a, b {
  color: red;
}

a c, a d, b c, b d {
  color: white;
}

Usage

Add PostCSS Nesting to your project:

npm install postcss-nesting --save-dev

Use PostCSS Nesting to process your CSS:

import postcssNesting from 'postcss-nesting';

postcssNesting.process(YOUR_CSS /*, processOptions, pluginOptions */);

Or use it as a PostCSS plugin:

import postcss from 'postcss';
import postcssNesting from 'postcss-nesting';

postcss([
  postcssNesting(/* pluginOptions */)
]).process(YOUR_CSS /*, processOptions */);

PostCSS Nesting runs in all Node environments, with special instructions for:

Node	Webpack	Create React App	Gulp	Grunt

Deno

You can also use PostCSS Nesting on Deno:

import postcss from "https://deno.land/x/postcss/mod.js";
import postcssNesting from "https://cdn.jsdelivr.net/npm/postcss-nesting@10/mod.js";

await postcss([postcssNesting]).process(YOUR_CSS /*, processOptions */);

⚠️ Spec disclaimer

The CSS Nesting Module spec states on nesting that "Declarations occuring after a nested rule are invalid and ignored.". While we think it makes sense on browsers, enforcing this at the plugin level introduces several constrains that would interfere with PostCSS' plugin nature such as with @mixin