explorer/webpack.server.config.js

var webpack = require("webpack"),
  path = require("path"),
  CopyWebpackPlugin = require("copy-webpack-plugin"),
  HtmlWebpackPlugin = require("html-webpack-plugin"),
  TerserPlugin = require("terser-webpack-plugin");
var { CleanWebpackPlugin } = require("clean-webpack-plugin");

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

const isDevelopment = process.env.NODE_ENV !== "production";

var options = {
  mode: process.env.NODE_ENV || "development",
  entry: {
    index: path.join(__dirname, "server", "index.ts"),
  },
  output: {
    filename: "[name].bundle.js",
    path: path.resolve(__dirname, "build", "server"),
    clean: true,
    publicPath: ASSET_PATH,
  },
  module: {
    rules: [
      {
        test: /\.(ts|tsx)$/,
        exclude: /node_modules/,
        use: [
          {
            loader: require.resolve("ts-loader"),
            options: {
              transpileOnly: isDevelopment,
            },
          },
        ],
      },
    ],
  },
  plugins: [
    new CleanWebpackPlugin({ verbose: false }),
    new webpack.ProgressPlugin(),
    new webpack.EnvironmentPlugin(["NODE_ENV"]),
  ].filter(Boolean),
  infrastructureLogging: {
    level: "info",
  },
};

if (process.env.NODE_ENV === "development") {
  options.devtool = "cheap-module-source-map";
} else {
  options.optimization = {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        extractComments: false,
      }),
    ],
  };
}

module.exports = options;