materio-d8/build/webpack.config.prod.js

'use strict'

const webpack = require('webpack')
const merge = require('webpack-merge')
const baseConfig = require('./webpack.config.base')
const MiniCssExtractPlugin  = require('mini-css-extract-plugin')
const UglifyJSPlugin = require('uglifyjs-webpack-plugin');

module.exports = merge(baseConfig, {
  mode: 'production',
  optimization: {
    minimizer: [
      new UglifyJSPlugin({
        uglifyOptions: {
          // Eliminate comments
          comments: false,
          // remove warnings
          warnings: false,
          compress: {
            // Drop console statements
            drop_console: true,
          }
        }
      })
    ]
  //   splitChunks: {
  //     cacheGroups: {
  //       commons: {
  //         test: /[\\/]node_modules[\\/]/,
  //         name: "vendor",
  //         chunks: "all",
  //       },
  //     },
  //   },
  },
  module: {
    rules: [
      {
        test: /\.css?$/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader'
        ]
      }, {
        test: /\.scss?$/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader',
          'sass-loader'
        ]
      }, {
        test: /\.(png|jpg|gif)$/,
        use: [
          {
            loader: 'url-loader',
            options: {
              limit: 5000
            }
          }
        ]
      }
    ]
  },
  plugins: [
    // new MiniCssExtractPlugin({
    //   filename: 'main.css'
    // })
  ]
})