Lightning CSS

Transform and minify your CSS files with Lightning CSS.

Options See on

extensions string[]

The list of extensions this plugin applies to

[ ".css" ]
includes string boolean

Custom includes path

options object

Options passed to parcel_css

  minify: true,
  drafts: { customMedia: true },
  targets: {
    android: 6422528,
    chrome: 6422528,
    edge: 6422528,
    firefox: 6356992,
    ios_saf: 983040,
    safari: 983040,
    opera: 5439488,
    samsung: 1048576


The lightningcss plugin bundles your CSS files using the Lightning CSS processor (previously known as Parcel CSS).


Import this plugin in your _config.ts file to use it:

import lume from "lume/mod.ts";
import lightningCss from "lume/plugins/lightningcss.ts";

const site = lume();

site.use(lightningCss(/* Options */));

export default site;


This plugin accepts a configuration object. The available options are:

  • extensions: Array with the extensions of the files that this plugin will load. By default is [".css"]. instead of replacing them.
  • options: An object with the options for lightning-css.
  • includes: The directory to search for the @imported files. By default it is "_includes". Set false to disable it.

Example with the default configuration:

import lume from "lume/mod.ts";
import lightningCss, { version } from "lume/plugins/lightningcss.ts";

const site = lume();

  extensions: [".css"],
  includes: "_includes",
  options: {
    minify: true,
    drafts: {
      nesting: true,
      customMedia: true,
    targets: {
      android: version(98),
      chrome: version(98),
      edge: version(98),
      firefox: version(97),
      ios_saf: version(15),
      safari: version(15),
      opera: version(83),
      samsung: version(16),

export default site;

The version() function is provided to convert a semver version to single 24-bit number as used by lightningcss. More info {.tip}