JoL-player/build/webpack.prod.config.js

const merge = require("webpack-merge");
const common = require("./webpack.common.config.js");
const path = require("path");

const { CleanWebpackPlugin } = require("clean-webpack-plugin");
const TerserPlugin = require("terser-webpack-plugin");

module.exports = merge(common, {
  mode: "production",
  devtool: "",
  entry: {
    index: "./src/index",
  },
  output: {
    filename: "[name].js",
    path: path.resolve(__dirname, "../dist"),
    libraryTarget: "commonjs2",
  },
  optimization: {
    minimize: true,
    minimizer: [new TerserPlugin()],
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ["style-loader", "css-loader"],
      },
      {
        test: /\.s[ac]ss$/i,
        use: [
          // Creates `style` nodes from JS strings
          "style-loader",
          // Translates CSS into CommonJS
          "css-loader",
          // Compiles Sass to CSS
          "sass-loader",
        ],
      },
    ],
  },
  plugins: [new CleanWebpackPlugin()],
  externals: {
    react: {
      root: "React",
      commonjs2: "react",
      commonjs: "react",
      amd: "react",
    },
    "react-dom": {
      root: "ReactDOM",
      commonjs2: "react-dom",
      commonjs: "react-dom",
      amd: "react-dom",
    },
  },
});