webpack.config.js

const path = require("path");
const webpack = require("webpack");
const CleanPlugin = require("clean-webpack-plugin");

module.exports = (env, argv) => {
  const pkg = require("./package.json");
  const NODE_ENV = argv.mode || "development";
  const VERSION = process.env.VERSION || pkg.version;

  return {
    devtool: NODE_ENV === "development" ? "source-map" : false,
    entry: path.join(__dirname, "src", "index.ts"),
    module: {
      rules: [
        {
          test: /\.ts$/,
          exclude: /node_modules/,
          loader: "ts-loader"
        },
        {
          test: /\.ts$/,
          enforce: "pre",
          exclude: /node_modules/,
          loader: "eslint-loader"
        }
      ]
    },
    output: {
      filename: "engine.js",
      library: "Engine",
      libraryTarget: "var",
      path: path.join(__dirname, "dist")
    },
    plugins: [
      new CleanPlugin(),
      new webpack.DefinePlugin({
        NODE_ENV: JSON.stringify(NODE_ENV),
        VERSION: JSON.stringify(VERSION)
      })
    ],
    resolve: {
      extensions: [".ts", ".js"]
    }
  };
};