postcss-lab-function

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 build tool:

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

Node

Use PostCSS Lab Function to process your CSS:

import postcssLabFunction from 'postcss-lab-function';

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

PostCSS

Add PostCSS to your build tool:

npm install postcss --save-dev

Use PostCSS Lab Function as a plugin:

import postcss from 'gulp-postcss';
import postcssLabFunction from 'postcss-lab-function';

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

Webpack

Add PostCSS Loader to your build tool:

npm install postcss-loader --save-dev

Use PostCSS Lab Function in your Webpack configuration:

import postcssLabFunction from 'postcss-lab-function';

module.exports = {
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          'style-loader',
          { loader: 'css-loader', options: { importLoaders: 1 } },
          { loader: 'postcss-loader', options: {
            ident: 'postcss',
            plugins: () => [
              postcssLabFunction(/* pluginOptions */)
            ]
          } }
        ]
      }
    ]
  }
}

Gulp

Add Gulp PostCSS to your build tool:

npm install gulp-postcss --save-dev

Use PostCSS Lab Function in your Gulpfile:

import postcss from 'gulp-postcss';
import postcssLabFunction from 'postcss-lab-function';

gulp.task('css', () => gulp.src('./src/*.css').pipe(
  postcss([
    postcssLabFunction(/* pluginOptions */)
  ])
).pipe(
  gulp.dest('.')
));

Grunt

Add Grunt PostCSS to your build tool:

npm install grunt-postcss --save-dev

Use PostCSS Lab Function in your Gruntfile:

import postcssLabFunction from 'postcss-lab-function';

grunt.loadNpmTasks('grunt-postcss');

grunt.initConfig({
  postcss: {
    options: {
      use: [
       postcssLabFunction(/* pluginOptions */)
      ]
    },
    dist: {
      src: '*.css'
    }
  }
});

Options

preserve

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

postcssImageSetFunction({ 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%);
}