webpack.prod.js

const {
  merge
} = require("webpack-merge");
const common = require("./webpack.common.js");
const path = require("path");
var HtmlWebpackPlugin = require("html-webpack-plugin");
const OptimizeCssAssetsPlugin = require('optimize-css-assets-webpack-plugin')
const TerserPlugin = require('terser-webpack-plugin')
const {
  CleanWebpackPlugin
} = require('clean-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')

module.exports = merge(common, {
  mode: "production",
  output: {
    filename: "[name].bundle.js",
    path: path.resolve(__dirname, "dist")
  },
  optimization: {
    minimizer: [
      new OptimizeCssAssetsPlugin(),
      new TerserPlugin(),
      new HtmlWebpackPlugin({
        template: "./src/index.html",
        minify: {
          removeAttributeQuotes: true,
          collapseWhitespace: true,
          removeComments: true
        }
      })
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: "[name].css"
    }), new CleanWebpackPlugin()
  ],
  module: {
    rules: [
      /* babel loader */
      {
        test: /\.js$/,
        exclude: "/node_modules/",
        use: [{
          loader: "babel-loader",
          options: {
            presets: ["@babel/preset-env"]
          }
        }]
      },
      {
        test: /\.(scss|css)$/,
        use: [
          MiniCssExtractPlugin.loader, //3. Extract css into files
          "css-loader", //2. Turns css into commonjs
          "sass-loader" //1. Turns sass into css
        ]
      }
    ]
  },
})