62 lines
2.6 KiB
Markdown
62 lines
2.6 KiB
Markdown
# Optimize CSS Assets Webpack Plugin
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A Webpack plugin to optimize \ minimize CSS assets.
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## What does the plugin do?
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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).
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### Solves [extract-text-webpack-plugin](http://github.com/webpack/extract-text-webpack-plugin) CSS duplication problem:
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Since [extract-text-webpack-plugin](http://github.com/webpack/extract-text-webpack-plugin) only bundles (merges) text chunks, if it's used to bundle CSS, the bundle might have duplicate entries (chunks can be duplicate free but when merged, duplicate CSS can be created).
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## Installation:
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Using npm:
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```shell
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$ npm install --save-dev optimize-css-assets-webpack-plugin
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```
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> :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.
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## Configuration:
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The plugin can receive the following options (all of them are optional):
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* `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$/g`
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* `cssProcessor`: The CSS processor used to optimize \ minimize the CSS, defaults to [`cssnano`](http://github.com/ben-eb/cssnano). This should be a function that follows `cssnano.process` interface (receives a CSS and options parameters and returns a Promise).
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* `cssProcessorOptions`: The options passed to the `cssProcessor`, defaults to `{}`
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* `cssProcessorPluginOptions`: The plugin options passed to the `cssProcessor`, defaults to `{}`
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* `canPrint`: A boolean indicating if the plugin can print messages to the console, defaults to `true`
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## Example:
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``` javascript
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var OptimizeCssAssetsPlugin = require('optimize-css-assets-webpack-plugin');
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module.exports = {
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module: {
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rules: [
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{
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test: /\.css$/,
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loader: ExtractTextPlugin.extract('style-loader', 'css-loader')
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}
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]
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},
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plugins: [
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new ExtractTextPlugin('styles.css'),
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new OptimizeCssAssetsPlugin({
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assetNameRegExp: /\.optimize\.css$/g,
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cssProcessor: require('cssnano'),
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cssProcessorPluginOptions: {
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preset: ['default', { discardComments: { removeAll: true } }],
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},
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canPrint: true
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})
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]
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};
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```
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## License
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MIT (http://www.opensource.org/licenses/mit-license.php)
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