postcss-extend-rule
Use the @extend at-rule and functional selectors in CSS
Last updated a year ago by jonathantneal .
CC0-1.0 · Repository · Bugs · Original npm · Tarball · package.json
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PostCSS Extend Rule PostCSS

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PostCSS Extend Rule lets you use the @extend at-rule and Functional Selectors in CSS, following the speculative CSS Extend Rules Specification.

%thick-border {
  border: thick dotted red;
}

.serious-modal {
  font-style: normal;
  font-weight: bold;

  @media (max-width: 240px) {
    @extend .modal:hover;
  }
}

.modal {
  @extend %thick-border;

  color: red;
}

.modal:hover:not(:focus) {
  outline: none;
}

/* becomes */

.serious-modal {
  font-style: normal;
  font-weight: bold;
}

@media (max-width: 240px) {
  .serious-modal:not(:focus) {
    outline: none;
  }
}

.modal {
  border: thick dotted red;
  color: red;
}

.modal:hover:not(:focus) {
  outline: none;
}

Usage

Add PostCSS Extend Rule to your project:

npm install postcss-extend-rule --save-dev

Use PostCSS Extend Rule to process your CSS:

const postcssExtendRule = require('postcss-extend-rule');

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

Or use it as a PostCSS plugin:

const postcss = require('postcss');
const postcssExtendRule = require('postcss-extend-rule');

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

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

Node PostCSS CLI Webpack Create React App Gulp Grunt

Options

name

The name option determines the at-rule name being used to extend selectors. By default, this name is extend, meaning @extend rules are parsed.

postcssExtend({ name: 'postcss-extend' })

If the name option were changed to, say, postcss-extend, then only @postcss-extend at-rules would be parsed.

main {
  @postcss-extend .some-rule;
}

onFunctionalSelector

The onFunctionalSelector option determines how functional selectors should be handled. Its options are:

  • remove (default) removes any functional selector
  • ignore ignores any functional selector and moves on
  • warn warns the user whenever it encounters a functional selector
  • throw throws an error if ever it encounters a functional selector
postcssExtend({ onFunctionalSelector: 'remove' /* default */ })
%this-will-be-removed {}

onRecursiveExtend

The onRecursiveExtend option determines how recursive extend at-rules should be handled. Its options are:

  • remove (default) removes any recursive extend at-rules
  • ignore ignores any recursive extend at-rules and moves on
  • warn warns the user whenever it encounters a recursive extend at-rules
  • throw throws an error if ever it encounters a recursive extend at-rules
postcssExtend({ onRecursiveExtend: 'remove' /* default */ })
.this-will-not-extend-itself {
  @extend .this-will-not-extend-itself;
}

onUnusedExtend

The onUnusedExtend option determines how an unused extend at-rule should be handled. Its options are:

  • remove (default) removes any unused extend at-rule
  • ignore ignores any unused extend at-rule and moves on
  • warn warns the user whenever it encounters an unused extend at-rule
  • throw throws an error if ever it encounters an unused extend at-rule
postcssExtend({ onUnusedExtend: 'remove' /* default */ })
main {
  @extend .this-selector-does-not-exist-and-will-be-removed;
}

Current Tags

  • 3.0.0                                ...           latest (a year ago)

3 Versions

  • 3.0.0                                ...           a year ago
  • 2.0.0                                ...           2 years ago
  • 1.1.0                                ...           3 years ago

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