# fela-plugin-responsive-value

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This plugin adds support for responsive values as pioneered by [styled-system](https://styled-system.com) where one passes an array of values that later resolved to respective media queries.

> **Warning**: This package might clash with [fela-plugin-fallback-value](../fela-plugin-fallback-value/) and thus requires a list of whitelisted properties. We recommend using it **before** the fallback value.

## Installation

```sh
yarn add fela-plugin-responsive-value
```

You may alternatively use `npm i --save fela-plugin-responsive-value`.

## Usage

Make sure to read the documentation on [how to use plugins](https://fela.js.org/docs/latest/advanced/plugins#using-plugins).

```javascript
import { createRenderer } from 'fela'
import responsiveValue from 'fela-plugin-responsive-value'

const renderer = createRenderer({
  plugins: [responsiveValue()],
})
```

### Configuration

##### Parameters

|  Parameter      | Value        | Default | Description                                                          |
| --------------- | ------------ | ------- | -------------------------------------------------------------------- |
| getMediaQueries | _(Function)_ |         | Resolve the list of media queries used based on the values and props |
| properties      | _(Object)_   |         | A map of property-boolean pairs of which properties are resolved     |

##### Example

```javascript
import { createRenderer } from 'fela'
import responsiveValue from 'fela-plugin-responsive-value'

// if we have 2 values, use default and large media query
// if we get 3, also use a tablet media query in between
const getMediaQueries = (values, props) => {
  if (values.length === 2) {
    return ['@media (min-width: 1024px)']
  }

  return ['@media (min-width: 800px)', '@media (min-width: 1024px)']
}

const renderer = createRenderer({
  plugins: [
    responsiveValue(getMediaQueries, {
      padding: true,
      margin: true,
    }),
  ],
})
```

## Example

Using the above example code:

#### Input

```javascript
{
  margin: [0, 10]
  padding: [5, 10, 15]
}
```

#### Output

```javascript
{
  margin: 0,
  padding: 5,
  "@media (min-width: 800px)": {
    padding: 10
  },
  "@media (min-width: 1024px)": {
    margin: 10,
    padding: 15
  }
}
```

## License

Fela is licensed under the [MIT License](http://opensource.org/licenses/MIT).<br>
Documentation is licensed under [Creative Commons License](http://creativecommons.org/licenses/by/4.0/).<br>
Created with ♥ by [@robinweser](http://weser.io) and all the great contributors.