a webpack plugin to shake unused css code
npm install webpack-css-treeshaking-plugin -Dconfig it in your webpack configuration file, it depends on extracting styles to a file, so please use ExtractTextPlugin first.
var ExtractTextPlugin = require('extract-text-webpack-plugin')
const CssTreeShakingPlugin = require("webpack-css-treeshaking-plugin")
module.exports = {
  plugins: [
    new CssTreeShakingPlugin({
      remove: false,
      ignore: ['state-\d']
    }),
    new ExtractTextPlugin({
      filename: 'build/style.css'
    })
  ]
};| property | type | default | discription | 
|---|---|---|---|
| remove | boolean | false | whether to remove unused css | 
| ignore | array | [] | items can be a string or a regexp | 

