cssnano-preset-advanced/README.md

# cssnano-preset-advanced

> Advanced optimisations for cssnano; may or may not break your CSS!

## Table of Contents

- [Usage](#usage)

  - [Install](#install)
  - [Configuration](#configuration)

- [Plugins](#plugins)

  - [autoprefixer (external)](#autoprefixer-external)
  - [css-declaration-sorter (external)](#css-declaration-sorter-external)
  - [cssnano-utils](#cssnano-utils)
  - [postcss-calc (external)](#postcss-calc-external)
  - [postcss-colormin](#postcss-colormin)
  - [postcss-convert-values](#postcss-convert-values)
  - [postcss-discard-comments](#postcss-discard-comments)
  - [postcss-discard-duplicates](#postcss-discard-duplicates)
  - [postcss-discard-empty](#postcss-discard-empty)
  - [postcss-discard-overridden](#postcss-discard-overridden)
  - [postcss-discard-unused](#postcss-discard-unused)
  - [postcss-merge-idents](#postcss-merge-idents)
  - [postcss-merge-longhand](#postcss-merge-longhand)
  - [postcss-merge-rules](#postcss-merge-rules)
  - [postcss-minify-font-values](#postcss-minify-font-values)
  - [postcss-minify-gradients](#postcss-minify-gradients)
  - [postcss-minify-params](#postcss-minify-params)
  - [postcss-minify-selectors](#postcss-minify-selectors)
  - [postcss-normalize-charset](#postcss-normalize-charset)
  - [postcss-normalize-display-values](#postcss-normalize-display-values)
  - [postcss-normalize-positions](#postcss-normalize-positions)
  - [postcss-normalize-repeat-style](#postcss-normalize-repeat-style)
  - [postcss-normalize-string](#postcss-normalize-string)
  - [postcss-normalize-timing-functions](#postcss-normalize-timing-functions)
  - [postcss-normalize-unicode](#postcss-normalize-unicode)
  - [postcss-normalize-url](#postcss-normalize-url)
  - [postcss-normalize-whitespace](#postcss-normalize-whitespace)
  - [postcss-ordered-values](#postcss-ordered-values)
  - [postcss-reduce-idents](#postcss-reduce-idents)
  - [postcss-reduce-initial](#postcss-reduce-initial)
  - [postcss-reduce-transforms](#postcss-reduce-transforms)
  - [postcss-svgo](#postcss-svgo)
  - [postcss-unique-selectors](#postcss-unique-selectors)
  - [postcss-zindex](#postcss-zindex)

- [Contributors](#contributors)

- [License](#license)

## Usage

### Install

With [npm](https://npmjs.com/package/cssnano-preset-advanced) do:

    npm install cssnano-preset-advanced --save-dev

If you don't have npm then [check out this installation tutorial](https://npmjs.com/package/cssnano-preset-advanced/tutorial).

### Configuration

If you would like to use the preset in its default configuration, specify a section in your `package.json`:

```diff
 {
   "name": "awesome-application",
+  "cssnano": {
+    "preset": "advanced"
+  }
 }
```

But should you wish to customise this, you can pass an array with the second parameter as the options object to use. For example, to remove all comments:

```diff
 {
   "name": "awesome-application",
+  "cssnano": {
+    "preset": [
+      "advanced",
+      {"discardComments": {"removeAll": true}}
+    ]
+  }
 }
```

Depending on your usage, the JSON configuration might not work for you, such as in cases where you would like to use options with customisable function parameters. For this use case, we recommend a `cssnano.config.js` at the same location as your `package.json`. You can then load a preset and export it with your custom parameters:

```js
const advancedPreset = require('cssnano-preset-advanced');

module.exports = advancedPreset({
  discardComments: {
    remove: (comment) => comment[0] === '@',
  },
});
```

Note that you may wish to publish your own preset to npm for reusability, should it differ a lot from this one. This is highly encouraged!

## Plugins

### [`autoprefixer`](https://github.com/postcss/autoprefixer) (external)

> Parse CSS and add vendor prefixes to CSS rules using values from the Can I Use website

This plugin is loaded with the following configuration:

```js
{
  add: false;
}
```

### [`css-declaration-sorter`](https://github.com/Siilwyn/css-declaration-sorter) (external)

> Sorts CSS declarations fast and automatically in a certain order.

This plugin is loaded with the following configuration:

```js
{
  exclude: true;
}
```

### [`cssnano-utils`](https://github.com/cssnano/cssnano/tree/master/packages/cssnano-utils)

> Utility methods used by cssnano

### [`postcss-calc`](https://github.com/postcss/postcss-calc) (external)

> PostCSS plugin to reduce calc()

This plugin is loaded with its default configuration.

### [`postcss-colormin`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-colormin)

> Minify colors in your CSS files with PostCSS.

This plugin is loaded with its default configuration.

### [`postcss-convert-values`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-convert-values)

> Convert values with PostCSS (e.g. ms -> s)

This plugin is loaded with the following configuration:

```js
{
  length: false;
}
```

### [`postcss-discard-comments`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-discard-comments)

> Discard comments in your CSS files with PostCSS.

This plugin is loaded with its default configuration.

### [`postcss-discard-duplicates`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-discard-duplicates)

> Discard duplicate rules in your CSS files with PostCSS.

This plugin is loaded with its default configuration.

### [`postcss-discard-empty`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-discard-empty)

> Discard empty rules and values with PostCSS.

This plugin is loaded with its default configuration.

### [`postcss-discard-overridden`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-discard-overridden)

> PostCSS plugin to discard overridden @keyframes or @counter-style.

This plugin is loaded with its default configuration.

### [`postcss-discard-unused`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-discard-unused)

> Discard unused counter styles, keyframes and fonts.

This plugin is loaded with its default configuration.

### [`postcss-merge-idents`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-merge-idents)

> Merge keyframe and counter style identifiers.

This plugin is loaded with its default configuration.

### [`postcss-merge-longhand`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-merge-longhand)

> Merge longhand properties into shorthand with PostCSS.

This plugin is loaded with its default configuration.

### [`postcss-merge-rules`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-merge-rules)

> Merge CSS rules with PostCSS.

This plugin is loaded with its default configuration.

### [`postcss-minify-font-values`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-minify-font-values)

> Minify font declarations with PostCSS

This plugin is loaded with its default configuration.

### [`postcss-minify-gradients`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-minify-gradients)

> Minify gradient parameters with PostCSS.

This plugin is loaded with its default configuration.

### [`postcss-minify-params`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-minify-params)

> Minify at-rule params with PostCSS

This plugin is loaded with its default configuration.

### [`postcss-minify-selectors`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-minify-selectors)

> Minify selectors with PostCSS.

This plugin is loaded with its default configuration.

### [`postcss-normalize-charset`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-normalize-charset)

> Add necessary or remove extra charset with PostCSS

This plugin is loaded with the following configuration:

```js
{
  add: false;
}
```

### [`postcss-normalize-display-values`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-normalize-display-values)

> Normalize multiple value display syntaxes into single values.

This plugin is loaded with its default configuration.

### [`postcss-normalize-positions`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-normalize-positions)

> Normalize keyword values for position into length values.

This plugin is loaded with its default configuration.

### [`postcss-normalize-repeat-style`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-normalize-repeat-style)

> Convert two value syntax for repeat-style into one value.

This plugin is loaded with its default configuration.

### [`postcss-normalize-string`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-normalize-string)

> Normalize wrapping quotes for CSS string literals.

This plugin is loaded with its default configuration.

### [`postcss-normalize-timing-functions`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-normalize-timing-functions)

> Normalize CSS animation/transition timing functions.

This plugin is loaded with its default configuration.

### [`postcss-normalize-unicode`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-normalize-unicode)

> Normalize unicode-range descriptors, and can convert to wildcard ranges.

This plugin is loaded with its default configuration.

### [`postcss-normalize-url`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-normalize-url)

> Normalize URLs with PostCSS

This plugin is loaded with its default configuration.

### [`postcss-normalize-whitespace`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-normalize-whitespace)

> Trim whitespace inside and around CSS rules & declarations.

This plugin is loaded with its default configuration.

### [`postcss-ordered-values`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-ordered-values)

> Ensure values are ordered consistently in your CSS.

This plugin is loaded with its default configuration.

### [`postcss-reduce-idents`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-reduce-idents)

> Reduce custom identifiers with PostCSS.

This plugin is loaded with its default configuration.

### [`postcss-reduce-initial`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-reduce-initial)

> Reduce initial definitions to the actual initial value, where possible.

This plugin is loaded with its default configuration.

### [`postcss-reduce-transforms`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-reduce-transforms)

> Reduce transform functions with PostCSS.

This plugin is loaded with its default configuration.

### [`postcss-svgo`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-svgo)

> Optimise inline SVG with PostCSS.

This plugin is loaded with its default configuration.

### [`postcss-unique-selectors`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-unique-selectors)

> Ensure CSS selectors are unique.

This plugin is loaded with its default configuration.

### [`postcss-zindex`](https://github.com/cssnano/cssnano/tree/master/packages/postcss-zindex)

> Reduce z-index values with PostCSS.

This plugin is loaded with its default configuration.

## Contributors

See [CONTRIBUTORS.md](https://github.com/cssnano/cssnano/blob/master/CONTRIBUTORS.md).

## License

MIT © [Ben Briggs](http://beneb.info)