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postcss-interpolate

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PostCSS plugin for values interpolation between breakpoints.

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# PostCSS-Interpolate

>[PostCSS] plugin for values interpolation between breakpoints.

[PostCSS]: https://github.com/postcss/postcss

This plugin made for automatically interpolation of property values between breakpoints. You can specify as much breakpoints, as you need.

Use this plugin for any __px/rem__ value interpolation (font-size, padding, margin and other). It __doesn't__ work with __%__ and __em__.

![](https://media.giphy.com/media/3og0IQyIEtGJYrCPNm/giphy.gif)

Inspired by this [draft].

[draft]: https://github.com/w3c/csswg-drafts/issues/581

## Installation

```
$ npm i --save-dev postcss-interpolate
```

## Syntax

`interpolate(direction, mediaquery-1, value-1, ... mediaquery-n, value-n)`

`direction`
  * __none__ — if you will not specify direction, plugin will you __vertically__ as defaul direction
  * __vertically__ or __vw__ — default derection.
  * __horizontally__ or __vh__

`mediaquery`
  works only with **px** units

`value`
  works only with **px** or **rem** units

## Examples
More examples at the tests folder.

![](https://media.giphy.com/media/3og0IOnvXx4GLSkG40/giphy.gif)
```css
/* Input */
.foo {
  font-size: interpolate(320px, 10px, 600px, 40px, 1200px, 10px);
}

/* Output */
.foo {
  font-size:  10px;
}
@media screen and (min-width: 320px) {
  .foo {
    font-size: calc( 10px + 30 * (100vw - 320px) / 280);
  }
}
@media screen and (min-width:  600px) {
  .foo {
    font-size: calc( 40px + -30 * (100vw -  600px) / 600);
  }
}
@media screen and (min-width:  1200px) {
  .foo {
    font-size:  10px;
  }
}
```

Padding example

![](https://media.giphy.com/media/3og0IKBuh7cKgaOxc4/giphy.gif)
```css
/* Input */
.foo {
  padding-top: interpolate(320px, 5px, 600px, 80px, 1200px, 5px);
}

/* Output */
.foo {
  padding-top:  5px;
}
@media screen and (min-width: 320px) {
  .foo {
    padding-top: calc( 5px + 75 * (100vw - 320px) / 280);
  }
}
@media screen and (min-width:  600px) {
  .foo {
    padding-top: calc( 80px + -75 * (100vw -  600px) / 600);
  }
}
@media screen and (min-width:  1200px) {
  .foo {
    padding-top:  5px;
  }
}
```

## Usage

```js
postcss([ require('postcss-interpolate') ])
```

If you are using **postcss-cssnext**, please, turn off pxrem plugin
```js
postcssInterpolate(),
postcssCssnext({
  features: {
    rem: false,
  }
})
```

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