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postcss-lightningcss
Advanced tools
This PostCSS plugin uses lightningcss to compile and minify your CSS.
lightningcss
is more than a minifier as it can replace several PostCSS plugins such as autoprefixer
.
You can find the complete list of features in the package's documentation and the list of plugins it can replace below.
yarn add -D postcss-lightningcss
const postcss = require("postcss");
const postcssLightningcss = require("postcss-lightningcss");
postcss([postcssLightningcss(/* pluginOptions */)]).process(
YOUR_CSS /*, processOptions */
);
const postcssLightningcss = require("postcss-lightningcss");
postcssLightningcss({
// Use a browserslist query that will inform which browsers are supported
// Will add or remove vendor prefixes that are needed or not anymore
browsers: ">= .25%",
// Auto set lightningcssOptions.cssModules, possible values:
// - auto - enable CSS modules for all files matching `/\.module(s)?\.\w+$/i.test(filename)`
// - RegExp - enable CSS modules for all files matching `/RegExp/i.test(filename)`
// - boolean - true enable css modules for all files
// Will be overwrite by the lightningcssOptions cssModules(boolean) option
cssModules: /\.module\.css/,
// Callback containing the transformed class names for cssModules
// this runs only if cssModules is enabled
cssModulesJSON(cssFileName: string, json: object, outputFileName: string): {},
// Will pass all options to lightningcss
// Check out their documentation for details:
// https://www.npmjs.com/package/lightningcss#user-content-documentation
lightningcssOptions: {
// Enable minification (default: true)
minify: true,
// Enable source maps (default: true)
sourceMap: true,
// Compile as cssModules (default: undefined)
cssModules: false,
// For which browsers to compile (default: undefined)
// Can be omitted if you set the `browsers` option
targets: {
safari: (13 << 16) | (2 << 8), // represents Safari 13.2.0
},
// Individually enable various drafts
drafts: {
// Enable css nesting (default: undefined)
nesting: false,
},
},
});
The detailed list of lightningcssOptions
can be found here
When transforming CSS Modules, class names get changed.
To get the mapping of the class names, you can specify a cssModulesJSON
function like the following:
const path = require("path");
const fs = require("fs");
postcssLightningcss({
cssModules: /\.module\.css/,
cssModulesJSON(cssFileName, json, outputFileName) {
const cssName = path.basename(cssFileName, ".css");
const jsonFileName = path.resolve("./build/" + cssName + ".json");
fs.writeFileSync(jsonFileName, JSON.stringify(json));
},
});
You may also combine this with custom naming patterns:
postcssLightningcss({
cssModulesJSON(cssFileName, json, outputFileName) {
// Your export function here
},
lightningcssOptions: {
cssModules: {
pattern: "my-company-[name]-[hash]-[local]",
},
},
});
Note that using a custom pattern cannot be used at the same time as using a RegEx to conditionally enable CSS modules because the
cssModules
option withinlightningcssOptions
takes precedence over the plugin'scssModules
option
Source maps will pass through lightningcss
.
But many mappings will be lost in translation; lightningcss
creates only a source map for selectors.
Mappings for properties cannot be re-created after this transformation.
lightningcss
This list is not exhaustive. If you have a doubt, have a look at the Lightning CSS Playground
The rows marked as "Depends on browser config" will convert your CSS only if:
browsers
or lightningcssOptions.targets
optionsPostCSS Plugin | lightningcss option |
---|---|
autoprefixer | Depends on browser config |
postcss-clamp | Depends on browser config |
postcss-color-hex-alpha | Depends on browser config |
postcss-color-hsl | Depends on browser config |
postcss-color-rgb | Depends on browser config |
postcss-color-function | Depends on browser config |
postcss-color-rebeccapurple | Depends on browser config |
postcss-custom-media | lightningcssOptions.drafts.customMedia |
postcss-double-position-gradients | Depends on browser config |
postcss-hwb-function | Depends on browser config |
postcss-lab-function | Depends on browser config |
postcss-logical | Depends on browser config (1) |
postcss-media-minmax | Depends on browser config |
postcss-multi-value-display | Depends on browser config |
postcss-nesting | lightningcssOptions.drafts.nesting |
postcss-normalize-display-values | Depends on browser config |
postcss-oklab-function | Depends on browser config |
postcss-overflow-shorthand | Depends on browser config |
postcss-place | Depends on browser config |
postcss-progressive-custom-properties | Depends on browser config (2) |
lightningcss
doesn't support the logical
shorthand keyword as its syntax is likely to changelab(29.2345% 39.3825 20.0664)
has a proper fallbackoklch(40% 0.234 0.39 / var(--opacity-50))
will not have a fallbackMIT
FAQs
PostCSS plugin to use lightningcss
The npm package postcss-lightningcss receives a total of 11,985 weekly downloads. As such, postcss-lightningcss popularity was classified as popular.
We found that postcss-lightningcss demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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