@liip/postcss-class-prefixer v0.2.0

postcss-class-prefixer

Prefix classes in your stylesheet with ease. This plugin only prefixes your classes, leaving everything else intact, with the option of adding a global container to each selectors.

Installation

npm i -D @liip/postcss-class-prefixer

Example

Providing this stylesheet

:root {
  --display: block;
}

body .btn {
  display: block;
}

[dir='rtl'].btn .btn--small {
  display: block;
}

* {
  display: block;
}

#btn button .btn:where(.btn--small, .btn--large):hover {
  display: block;
}

.md\:btn {
  display: block;
}

@media (hover: none), (pointer: coarse) {
  .btn:is(.btn--small, .btn--large):hover .btn--primary.excluded {
    display: block;
  }
}

@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

This plugin will output

/* stylelint-disable selector-max-id, selector-no-qualifying-type, no-duplicate-selectors */

:root {
  --display: block;
}

body .prefix-btn {
  display: block;
}

[dir='rtl'].prefix-btn .prefix-btn--small {
  display: block;
}

* {
  display: block;
}

#btn button .prefix-btn:where(.prefix-btn--small, .prefix-btn--large):hover {
  display: block;
}

.md\:prefix-btn {
  display: block;
}

@media (hover: none), (pointer: coarse) {
  .prefix-btn:is(.prefix-btn--small, .prefix-btn--large):hover
    .prefix-btn--primary.excluded {
    display: block;
  }
}

@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

Usage

// postcss.config.js

const options = {
  prefix: {
    value: 'prefix-',
  },
};

module.exports = {
  plugins: [...require('@liip/postcss-class-prefixer')(options)],
};

Options

You can configure the way the plugin works by setting different options.

type PrefixerOptions = {
  prefix?: PrefixOptions;
  container?: ContainerOptions;
};

prefix

Define the class prefix options

type PrefixOptions = {
  value: string;
  excludes?: TestConditions;
};

type TestConditions = (string | RegExp)[];

value

Define the actual string used to prefix classes

excludes

Strings or regular expressions to exclude certain classes from the transformation.

container

Define containerization options

type ContainerOptions = {
  value: string;
  excludes?: ContainerExcludes;
  preserveRoots?: ContainerPreserveRoots;
};

type ContainerExcludes = {
  element?: TestConditions | undefined;
  'pseudo-class'?: TestConditions | undefined;
  attribute?: TestConditions | undefined;
};

type ContainerPreserveRoots = {
  element?: TestConditions | undefined;
  'pseudo-class'?: TestConditions | undefined;
  attribute?: TestConditions | undefined;
};

type TestConditions = (string | RegExp)[];

value

Define the actual string used to containerize classes

excludes

An object of node types keys containing strings or regular expressions to exclude certain elements from containerization

preserveRoots

An object of node types keys containing strings or regular expressions specifying which elements should be kept at the root of the selector