webpack.prod.js

const { merge } = require("webpack-merge");
const CopyWebpackPlugin = require("copy-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const TerserPlugin = require("terser-webpack-plugin");

const common = require("./webpack.common.js");
const postCssPlugins = [require("autoprefixer")(), require("cssnano")()];

module.exports = merge(common, {
  mode: "production",
  module: {
    rules: [
      {
        test: /\.scss$/,
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: "css-loader",
          },
          {
            loader: "postcss-loader",
            options: {
              postcssOptions: {
                plugins: postCssPlugins,
              },
            },
          },
          {
            loader: "sass-loader",
          },
        ],
      },
    ],
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: "[name].[contenthash].css",
      outputPath: "css/",
    }),
    new CopyWebpackPlugin({
      patterns: ["./src/pgp.key"],
    }),
  ],
  optimization: {
    minimize: true,
    minimizer: [new TerserPlugin()],
  },
});