webpack optimization API configuration

webpack-optimization-config.js

optimization: {
  minimizer: [
    new UglifyJsWebpackPlugin(),
    new OptimizeCssAssetsPlugin({
      cssProcessorOptions: { discardComments: { removeAll: true } }
    })
  ],
  splitChunks: {
    chunks: 'all',
    cacheGroups: {
      styles: {
        name: 'bundle',
        test: /\.(css|scss)$/,
        chunks: 'all',
        enforce: true
      }
    }
  }
},