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+# Optimize CSS Assets Webpack Plugin
+
+A Webpack plugin to optimize \ minimize CSS assets.
+
+## What does the plugin do?
+
+It will search for CSS assets during the Webpack build and will optimize \ minimize the CSS (by default it uses [cssnano](http://github.com/ben-eb/cssnano) but a custom CSS processor can be specified).
+
+### Solves [extract-text-webpack-plugin](http://github.com/webpack/extract-text-webpack-plugin) CSS duplication problem:
+
+Since [extract-text-webpack-plugin](http://github.com/webpack/extract-text-webpack-plugin) only bundles (merges) text chunks, if its used to bundle CSS, the bundle might have duplicate entries (chunks can be duplicate free but when merged, duplicate CSS can be created).
+
+## Installation:
+
+Using npm:
+```shell
+$ npm install --save-dev optimize-css-assets-webpack-plugin
+```
+
+> :warning: For webpack v3 or below please use `optimize-css-assets-webpack-plugin@3.2.0`. The `optimize-css-assets-webpack-plugin@4.0.0` version and above supports webpack v4.
+
+## Configuration:
+
+The plugin can receive the following options (all of them are optional):
+* assetNameRegExp: A regular expression that indicates the names of the assets that should be optimized \ minimized. The regular expression provided is run against the filenames of the files exported by the ExtractTextPlugin instances in your configuration, not the filenames of your source CSS files. Defaults to `/\.css$/g`
+* cssProcessor: The CSS processor used to optimize \ minimize the CSS, defaults to [cssnano](http://github.com/ben-eb/cssnano). This should be a function that follows cssnano.process interface (receives a CSS and options parameters and returns a Promise).
+* cssProcessorOptions: The options passed to the cssProcessor, defaults to `{}`
+* canPrint: A boolean indicating if the plugin can print messages to the console, defaults to `true`
+
+## Example:
+
+``` javascript
+var OptimizeCssAssetsPlugin = require('optimize-css-assets-webpack-plugin');
+module.exports = {
+  module: {
+    rules: [
+      {
+        test: /\.css$/,
+        loader: ExtractTextPlugin.extract('style-loader', 'css-loader')
+      }
+    ]
+  },
+  plugins: [
+    new ExtractTextPlugin('styles.css'),
+    new OptimizeCssAssetsPlugin({
+      assetNameRegExp: /\.optimize\.css$/g,
+      cssProcessor: require('cssnano'),
+      cssProcessorOptions: { safe: true, discardComments: { removeAll: true } },
+      canPrint: true
+    })
+  ]
+};
+```
+
+## License
+
+MIT (http://www.opensource.org/licenses/mit-license.php)