webpack.prod.js

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

module.exports = merge(baseConfig, {
  mode: "production",
  devtool: "source-map",
  optimization: {
    minimizer: [new TerserPlugin({ parallel: true }), new CssMinimizerPlugin()],
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: "[name]-[contenthash].css",
      chunkFilename: "[id].css",
    }),
    new webpack.DefinePlugin({
      "process.env.NODE_ENV": JSON.stringify("production"),
    }),
  ],
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: "css-loader",
            options: {
              importLoaders: 1,
              sourceMap: true,
            },
          },
          {
            loader: "postcss-loader",
            options: {
              sourceMap: true,
            },
          },
        ],
      },
    ],
  },
});