webpack.prod.js

const { merge } = require("webpack-merge");
const common = require("./webpack.common.js");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const CopyWebpackPlugin = require("copy-webpack-plugin");
const CssMinimizerPlugin = require("css-minimizer-webpack-plugin");
const TerserPlugin = require("terser-webpack-plugin");

module.exports = merge(common, {
  mode: "production",
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [MiniCssExtractPlugin.loader, "css-loader"],
      },
      {
        test: /\.s[ac]ss$/i,
        use: [MiniCssExtractPlugin.loader, "css-loader", "sass-loader"],
      },
    ],
  },
  optimization: {
    splitChunks: false,
    minimize: true,
    minimizer: [new TerserPlugin(), new CssMinimizerPlugin()],
  },
  plugins: [
    new MiniCssExtractPlugin({}),
    new HtmlWebpackPlugin({
      template: "./index.html",
    }),
    new CopyWebpackPlugin({
      patterns: [{ from: "./public", to: "./public" }],
    }),
  ],
});