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postcss-prefix-selector

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postcss-prefix-selector

Prefix all CSS rules with a selector


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299K
decreased by-13.97%
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What is postcss-prefix-selector?

The postcss-prefix-selector npm package is a PostCSS plugin that allows you to add a prefix to all CSS selectors. This can be useful for scoping styles to a specific part of a page, avoiding conflicts with other styles, or applying styles conditionally.

What are postcss-prefix-selector's main functionalities?

Prefixing all selectors

This feature allows you to add a prefix to all CSS selectors. In this example, the selector '.foo' is prefixed with '.my-prefix', resulting in '.my-prefix .foo'.

const postcss = require('postcss');
const prefixer = require('postcss-prefix-selector');

const css = '.foo { color: red; }';

postcss([prefixer({ prefix: '.my-prefix' })])
  .process(css)
  .then(result => {
    console.log(result.css);
  });
// Output: .my-prefix .foo { color: red; }

Excluding specific selectors

This feature allows you to exclude specific selectors from being prefixed. In this example, the selector '.bar' is excluded from being prefixed, so only '.foo' is prefixed.

const postcss = require('postcss');
const prefixer = require('postcss-prefix-selector');

const css = '.foo { color: red; } .bar { color: blue; }';

postcss([prefixer({ prefix: '.my-prefix', exclude: ['.bar'] })])
  .process(css)
  .then(result => {
    console.log(result.css);
  });
// Output: .my-prefix .foo { color: red; } .bar { color: blue; }

Transforming the prefix

This feature allows you to transform the prefix in a custom way. In this example, the prefix is transformed to include '--' between the prefix and the selector.

const postcss = require('postcss');
const prefixer = require('postcss-prefix-selector');

const css = '.foo { color: red; }';

postcss([prefixer({ prefix: '.my-prefix', transform: (prefix, selector, prefixedSelector) => `${prefix}--${selector}` })])
  .process(css)
  .then(result => {
    console.log(result.css);
  });
// Output: .my-prefix--.foo { color: red; }

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Package last updated on 10 Oct 2024

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