webpack.prod.js

const { merge } = require("webpack-merge");
const common = require("./webpack.common");
const { CleanWebpackPlugin } = require("clean-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const CssMinimizerPlugin = require("css-minimizer-webpack-plugin");
const TerserPlugin = require("terser-webpack-plugin");

module.exports = merge(common, {
  mode: "production",
  plugins: [
    new MiniCssExtractPlugin({ filename: "[name].[contenthash].css" }),
    new CleanWebpackPlugin(),
  ],
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: [
          {
            loader: "babel-loader",
            options: {
              presets: ["@babel/preset-env"],
            },
          },
        ],
      },
    ],
  },
  optimization: {
    minimize: true,
    minimizer: [
      new CssMinimizerPlugin(),
      new TerserPlugin({
        terserOptions: {
          compress: {},
        },
      }),
    ],
    splitChunks: {
      chunks: "all",
    },
  },
});