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# PostCSS JS [![Build Status][ci-img]][ci]
<img align="right" width="95" height="95"
title="Philosopher’s stone, logo of PostCSS"
src="http://postcss.github.io/postcss/logo.svg">
[PostCSS] for React Inline Styles, Radium, JSS and other CSS-in-JS.
For example, to use [Stylelint], [RTLCSS] or [postcss-write-svg] plugins
in your workflow.
[postcss-write-svg]: https://github.com/jonathantneal/postcss-write-svg
[Stylelint]: https://github.com/stylelint/stylelint
[PostCSS]: https://github.com/postcss/postcss
[RTLCSS]: https://github.com/MohammadYounes/rtlcss
[ci-img]: https://travis-ci.org/postcss/postcss-js.svg
[ci]: https://travis-ci.org/postcss/postcss-js
## Usage
### Installation
```sh
npm i postcss-js
```
### Processing
```js
const postcssJs = require('postcss-js')
const autoprefixer = require('autoprefixer')
const prefixer = postcssJs.sync([ autoprefixer ]);
const style = prefixer({
userSelect: 'none'
});
style //=> {
// WebkitUserSelect: 'none',
// MozUserSelect: 'none',
// msUserSelect: 'none',
// userSelect: 'none'
// }
```
### Compile CSS-in-JS to CSS
```js
const postcss = require('postcss')
const postcssJs = require('postcss-js')
const style = {
top: 10,
'&:hover': {
top: 5
}
};
postcss().process(style, { parser: postcssJs }).then( (result) => {
result.css //=> top: 10px;
// &:hover { top: 5px; }
})
```
### Compile CSS to CSS-in-JS
```js
const postcss = require('postcss')
const postcssJs = require('postcss-js')
const css = '@media screen { z-index: 1 }'
const root = postcss.parse(css);
postcssJs.objectify(root) //=> { '@media screen': { zIndex: '1' } }
```
## API
### `sync(plugins): function`
Create PostCSS processor with simple API, but with only sync PostCSS plugins
support.
Processor is just a function, which takes one style object and return other.
### `async(plugins): function`
Same as `sync`, but also support async plugins.
Returned processor will return Promise.
### `parse(obj): Root`
Parse CSS-in-JS style object to PostCSS `Root` instance.
It converts numbers to pixels and parses
[Free Style] like selectors and at-rules:
```js
{
'@media screen': {
'&:hover': {
top: 10
}
}
}
```
This methods use Custom Syntax name convention, so you can use it like this:
```js
postcss().process(obj, { parser: postcssJs })
```
### `objectify(root): object`
Convert PostCSS `Root` instance to CSS-in-JS style object.
## Troubleshoot
Webpack may need some extra config for some PostCSS plugins.
### `Module parse failed`
Autoprefixer and some other plugins
need a [json-loader](https://github.com/webpack/json-loader) to import data.
So, please install this loader and add to webpack config:
```js
loaders: [
{
test: /\.json$/,
loader: "json-loader"
}
]
```