PostCSS Discard [![Build Status][ci-img]][ci]

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

[postcss]: https://github.com/postcss/postcss
[ci-img]: https://github.com/bezoerb/postcss-discard/workflows/Tests/badge.svg
[ci]: https://github.com/bezoerb/postcss-discard/actions?workflow=Tests

Usage

``js
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

$3

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

$3

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

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

@media print {
...;
}
`

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

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