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+# [postcss][postcss]-filter-plugins [![Build Status](https://travis-ci.org/postcss/postcss-filter-plugins.svg?branch=master)][ci]
+
+> Exclude/warn on duplicated PostCSS plugins.
+
+## Install
+
+With [npm](https://npmjs.org/package/postcss-filter-plugins) do:
+
+```console
+$ npm install postcss-filter-plugins --save
+```
+
+## Example
+
+Note that this plugin does not actually transform your CSS; instead, it ensures
+that plugins in the PostCSS instance are not duplicated. It is intended to be
+used by plugin packs such as [cssnano] or [cssnext].
+
+```js
+var counter = postcss.plugin('counter', function () {
+    return function (css) {
+        css.eachDecl('foo', function (decl) {
+            let value = parseInt(decl.value, 10);
+            value += 1;
+            decl.value = String(value);
+        });
+    }
+});
+
+var css = 'h1 { foo: 1 }';
+var out = postcss([
+    filter(),
+    counter(),
+    counter()
+]).process(css).css;
+
+console.log(out);
+// => h1 { foo: 2 }
+// Note that you will get a PostCSS warning in the message registry
+```
+
+## API
+
+### filterPlugins([options])
+
+#### options
+
+##### direction
+
+Type: `string`  
+Default: `'both'`
+
+Pass `'forward'`, `'backward'`, or `'both'` to customise the direction in which the
+plugin will look in the plugins array. See the [tests] for examples on how this
+works.
+
+```js
+postcss([ filter({
+    direction: 'forward'
+}) ]).process(css).css);
+```
+
+##### exclude
+
+Type: `array`  
+Default: `[] (empty)`
+
+Plugins that should be excluded from the filter. Pass an array of plugin names.
+
+```js
+postcss([ filter({
+    exclude: ['postcss-cssstats']
+}) ]).process(css).css);
+```
+
+##### silent
+
+Type: `boolean`  
+Default: `false`
+
+Set this to true to disable the plugin from emitting any PostCSS warnings.
+
+```js
+postcss([ filter({
+    silent: true
+}) ]).process(css).css);
+```
+
+##### template
+
+Type: `function`  
+Default: `format function`
+
+This function will be passed each PostCSS plugin object. You are expected to
+return a string from each call, which is then used to warn the user about her
+duplicated plugins.
+
+```js
+postcss([ filter({
+    template: function (plugin) {
+        return 'Duplicate plugin found: ' + plugin.postcssPlugin;
+    }
+}) ]).process(css).css);
+```
+
+## Usage
+
+See the [PostCSS documentation](https://github.com/postcss/postcss#usage) for
+examples for your environment.
+
+## Contributors
+
+Thanks goes to these wonderful people ([emoji key](https://github.com/kentcdodds/all-contributors#emoji-key)):
+
+<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
+| [<img src="https://avatars.githubusercontent.com/u/1282980?v=3" width="100px;"/><br /><sub>Ben Briggs</sub>](http://beneb.info)<br />[💻](https://github.com/postcss/postcss-filter-plugins/commits?author=ben-eb) [📖](https://github.com/postcss/postcss-filter-plugins/commits?author=ben-eb) 👀 [⚠️](https://github.com/postcss/postcss-filter-plugins/commits?author=ben-eb) | [<img src="https://avatars.githubusercontent.com/u/157534?v=3" width="100px;"/><br /><sub>Maxime Thirouin</sub>](https://moox.io/)<br />[📖](https://github.com/postcss/postcss-filter-plugins/commits?author=MoOx) | [<img src="https://avatars.githubusercontent.com/u/373545?v=3" width="100px;"/><br /><sub>Andreas Lind</sub>](https://github.com/papandreou)<br />[💻](https://github.com/postcss/postcss-filter-plugins/commits?author=papandreou) |
+| :---: | :---: | :---: |
+<!-- ALL-CONTRIBUTORS-LIST:END -->
+
+This project follows the [all-contributors](https://github.com/kentcdodds/all-contributors) specification.
+Contributions of any kind welcome!
+
+
+## License
+
+MIT © [Ben Briggs](http://beneb.info)
+
+[ci]:      https://travis-ci.org/postcss/postcss-filter-plugins
+[cssnano]: http://cssnano.co
+[cssnext]: http://cssnext.io
+[postcss]: https://github.com/postcss/postcss
+[tests]:   src/__tests__