webpack.prod.js

const path = require("path");
const { merge } = require("webpack-merge");
const common = require("./webpack.common.js");
const { stylePaths } = require("./stylePaths");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const CssMinimizerPlugin = require("css-minimizer-webpack-plugin");
const TerserJSPlugin = require("terser-webpack-plugin");

const ASSET_PATH = process.env.ASSET_PATH || "./";

module.exports = merge(common("production"), {
  mode: "production",
  devtool: "source-map",
  output: {
    filename: "[name].bundle.js",
    path: path.resolve(__dirname, "dist"),
    publicPath: ASSET_PATH,
  },
  optimization: {
    minimizer: [
      new TerserJSPlugin({}),
      new CssMinimizerPlugin({
        minimizerOptions: {
          preset: ["default", { mergeLonghand: false }],
        },
      }),
    ],
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: "[name].css",
      chunkFilename: "[name].bundle.css",
    }),
  ],
  module: {
    rules: [
      {
        test: /\.css$/,
        include: [...stylePaths],
        use: [MiniCssExtractPlugin.loader, "css-loader", "postcss-loader"],
      },
    ],
  },
});