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README.md

PostCSS Lab Function

PostCSS Lab Function lets you use lab, lch, and gray color functions in CSS, following the CSS Color specification.

:root {
  --firebrick: lab(40 56.6 39);
  --firebrick-a50: lch(40 68.8 34.5 / 50%);
  --gray-40: gray(40);
  --gray-40a50: gray(40 / .5);
}

/* becomes */

:root {
  --firebrick: rgb(178, 34, 34);
  --firebrick-a50: rgba(178, 34, 34, .5);
  --gray-40: rgb(94,94,94);
  --gray-40a50: rgba(94,94,94, .5);
}

Usage

Add PostCSS Lab Function to your project:

npm install postcss-lab-function --save-dev

Use PostCSS Lab Function to process your CSS:

const postcssLabFunction = require('postcss-lab-function');

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

Or use it as a PostCSS plugin:

const postcss = require('postcss');
const postcssLabFunction = require('postcss-lab-function');

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

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

Node	PostCSS CLI	Webpack	Create React App	Gulp	Grunt

Options

preserve

The preserve option determines whether the original functional color notation is preserved. By default, it is not preserved.

postcssLabFunction({ preserve: true })

:root {
  --firebrick: lab(40 56.6 39);
  --firebrick-a50: lch(40 68.8 34.5 / 50%);
}

/* becomes */

:root {
  --firebrick: rgb(178, 34, 34);
  --firebrick: lab(40 56.6 39);
  --firebrick-a50: rgba(178, 34, 34, .5);
  --firebrick-a50: lch(40 68.8 34.5 / 50%);
}