# postcss-viewport-units

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Automatically append `content` property for [viewport-units-buggyfill](https://github.com/rodneyrehm/viewport-units-buggyfill).

## Install

```bash
$ npm install postcss-viewport-units
```

## Usage

See [PostCSS](https://github.com/postcss/postcss#usage) usage section for detail.

### Options

`onlyCalc`(`[Boolean]`): if `ture`, only process `calc` values. it's `false` by default, which means, all values including `vw` `vh` `vmin` `vmax` are processed.

`test`(`[Function]`): used to judge whether current value of declaration should be considered including viewport units, the default is `value => /\d(vw|vh|vmax|vmin)\b/.test(value)`.

`filterFile`(`[Function]`): used to filter out files which need be processed, you can refer to [test case](test/index.js) to see how it works.

`filterRule`(`[Function]`): used to filter out rules which need be processed, you can refer to [test case](test/index.js) to see how it works.

`silence`(`[Boolean]`): if `true`, will not print warning even though there is a `content` property. it's `false` by default.

## License

MIT.