@applaud/optimize-cssnano-plugin

It will search for CSS assets during the Webpack build and minimize it with cssnano. Solves extract-text-webpack-plugin CSS duplication problem.

Just like optimize-css-assets-webpack-plugin but more accurate with source maps.

Installation:

Using npm:

$ npm install --save-dev @applaud/optimize-cssnano-plugin

Configuration:

const OptimizeCssnanoPlugin = require('@applaud/optimize-cssnano-plugin');
module.exports = {
	module: {
		loaders: [
			{ test: /\.css$/, loader: ExtractTextPlugin.extract("style-loader", "css-loader") }
		]
	},
	plugins: [
    new ExtractTextPlugin("styles.css"),

    new OptimizeCssnanoPlugin({
      sourceMap: nextSourceMap,
      cssnanoOptions: {
        preset: ['default', {
          discardComments: {
            removeAll: true,
          },
        }],
      },
    }),
	]
}