webpack.prod.js

const HtmlWebpackPlugin = require('html-webpack-plugin');

const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
const TerserPlugin = require('terser-webpack-plugin');
const WorkboxPlugin = require('workbox-webpack-plugin');
module.exports = {
  mode : 'production',
  entry: "./src/client/index.js",
  output: {
    libraryTarget: 'var',
    library: 'Client'
  },
  optimization: {
    minimizer: [new TerserPlugin({}), new OptimizeCSSAssetsPlugin({})],
  },
  module: {
    rules: [
      {
        test: /\.m?js$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader",
          options: {
            presets: ["@babel/preset-env"],
          },
        },
      },
      {
        test: /\.scss$/,
        use: [MiniCssExtractPlugin.loader, "css-loader", "sass-loader"],
      },
    ],
  },
   plugins: [
    new HtmlWebpackPlugin({
        template: "./src/client/views/index.html",
        filename: "index.html"
    }),
    new CleanWebpackPlugin({
      // Simulate the removal of files
      dry: true,
      // Write Logs to Console
      verbose: true,
      // Automatically remove all unused webpack assets on rebuild
      cleanStaleWebpackAssets: true,
      protectWebpackAssets: false
  }),
  new MiniCssExtractPlugin({ filename: "[name].css" }),
  new WorkboxPlugin.GenerateSW()
  ]
};