shift73k/assets_old/node_modules/postcss-prefix-selector/README.md

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# postcss-prefix-selector
[![NPM version][npm-image]][npm-url]
[![Build status][travis-image]][travis-url]
[![Test coverage][coveralls-image]][coveralls-url]
[![Dependency Status][david-image]][david-url]
[![License][license-image]][license-url]
[![Downloads][downloads-image]][downloads-url]
[![Gitpod ready-to-code][gitpod-image]][gitpod-url]
> Prefix every CSS selector with a custom namespace `.a => .prefix .a`
## Table of Contents
- [Install](#install)
- [Usage with PostCSS](#usage-with-postcss)
- [Usage with Webpack](#usage-with-webpack)
- [Options](#options)
- [Maintainer](#maintainer)
- [Contribute](#contribute)
- [License](#license)
## Install
```console
$ npm install postcss-prefix-selector
```
## Usage with PostCSS
```js
const prefixer = require('postcss-prefix-selector')
// css to be processed
const css = fs.readFileSync("input.css", "utf8")
const out = postcss().use(prefixer({
prefix: '.some-selector',
exclude: ['.c'],
// Optional transform callback for case-by-case overrides
transform: function (prefix, selector, prefixedSelector) {
if (selector === 'body') {
return 'body' + prefix;
} else {
return prefixedSelector;
}
}
})).process(css).css
```
Using the options above and the CSS below...
```css
body {
background: red;
}
.a, .b {
color: aqua;
}
.c {
color: coral;
}
```
You will get the following output
```css
body.some-selector {
background: red;
}
.some-selector .a, .some-selector .b {
color: aqua;
}
.c {
color: coral;
}
```
## Usage with webpack
Use it like you'd use any other PostCSS plugin. If you also have `autoprefixer` in your webpack config then make sure that `postcss-prefix-selector` is called first. This is needed to avoid running the prefixer twice on both standard selectors and vendor specific ones (ex: `@keyframes` and `@webkit-keyframes`).
```js
module: {
rules: [{
test: /\.css$/,
use: [
require.resolve('style-loader'),
require.resolve('css-loader'),
{
loader: require.resolve('postcss-loader'),
options: {
postcssOptions: {
plugins: {
"postcss-prefix-selector": {
prefix: '.my-prefix',
transform(prefix, selector, prefixedSelector) {
if (selector.match(/^(html|body)/)) {
return selector.replace(/^([^\s]*)/, `$1 ${prefix}`);
}
return prefixedSelector;
},
},
autoprefixer: {
browsers: ['last 4 versions']
}
}
}
}
}
]
}]
}
```
## Options
- `prefix` - This string is added before every CSS selector.
- `exclude` - It's possible to avoid prefixing some selectors by passing an array of selectors (strings or regular expressions).
- `transform` - In cases where you may want to use the prefix differently for different selectors, it is possible to pass in a custom transform method.
- `ignoreFiles` - List of ignored files for processing.
- `includeFiles` - List of included files for processing.
## Maintainer
This project was originally created by [@jongleberry](https://github.com/jonathanong) and is being maintained by [@RadValentin](https://github.com/RadValentin). If you have any questions, feel free to ping the latter.
## Contribute
Please contribute! If you have any questions or bugs, [open an issue](https://github.com/RadValentin/postcss-prefix-selector/issues/new). Or, open a pull request with a fix.
This project uses Mocha. If you submit a PR, please add appropriate tests and make sure that everything is green for your branch.
## License
[MIT](LICENSE) © 2015-2019 Jonathan Ong.
[gitpod-image]: https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod
[gitpod-url]: https://gitpod.io/#https://github.com/RadValentin/postcss-prefix-selector
[npm-image]: https://img.shields.io/npm/v/postcss-prefix-selector.svg?style=flat-square
[npm-url]: https://npmjs.org/package/postcss-prefix-selector
[travis-image]: https://img.shields.io/travis/RadValentin/postcss-prefix-selector.svg?style=flat-square
[travis-url]: https://travis-ci.org/RadValentin/postcss-prefix-selector
[coveralls-image]: https://img.shields.io/coveralls/jonathanong/postcss-prefix-selector.svg?style=flat-square
[coveralls-url]: https://coveralls.io/r/jonathanong/postcss-prefix-selector
[david-image]: http://img.shields.io/david/RadValentin/postcss-prefix-selector.svg?style=flat-square
[david-url]: https://david-dm.org/RadValentin/postcss-prefix-selector
[license-image]: http://img.shields.io/npm/l/postcss-prefix-selector.svg?style=flat-square
[license-url]: LICENSE
[downloads-image]: http://img.shields.io/npm/dm/postcss-prefix-selector.svg?style=flat-square
[downloads-url]: https://npmjs.org/package/postcss-prefix-selector