README.md

PostCSS Discard

PostCSS plugin to discard rules by selector, RegExp, or @type. Also usable to generate a diff from two stylesheets

Usage

const discard = require('postcss-discard');
postcss([discard(options)]);

See PostCSS docs for examples for your environment.

Options

Name	Type	Description
atrule	String, RegExp, Function	Match atrule like @font-face
rule	String, RegExp, Function	Match rule like .big-background-image {...}
decl	String, RegExp, Function	Match declarations
css	String	CSS String or path to file containing css

You can also pass a filter function for any of the supported types. The function is invoked with two arguments (node, value).

• node The currently processed AST node generated by postcss.
• value Current value.

Return true if the element should be discarded.

Examples

Diffing stylesheets

postcss(discard({css: 'STYLES TO BE REMOVED'})).process('ORIGINAL CSS').css;

Discard by specifying rules

.bg {
  width: 100%;
  height: 100%;
  background-image: url('some/big/image.png');
}

@font-face {
  font-family: 'My awesome font';
}

@media print {
  ...;
}

postcss([
  discard({
    atrule: ['@font-face', /print/],
  }),
]);

.bg {
  width: 100%;
  height: 100%;
}