webpack plugin for css deduplication, remove duplicated css rules

npm install dedupcss-webpack-plugin --save-dev

var DedupCSSPlugin = require('dedupcss-webpack-plugin');

...

{
  plugins: [new DedupCSSPlugin({})]
}

Options:

• suffix: a suffix for the deduped asset. Defaults to '.css'
• override: if set to true the original asset will be overriden. Defaults to false.