webpack.config.js

const fs = require("fs");
const webpack = require("webpack");
const UglifyJsPlugin = require("uglifyjs-webpack-plugin");

const useMinification = process.env.BUILD_MINIFIED === "true";
const packageName = JSON.parse(fs.readFileSync("package.json", "utf8")).name;
const libraryName = packageName.replace(/(^|-)(.)/g, (match, _, c) => (c ? c.toUpperCase() : ""));

const config = {
  entry: "./src/index.ts",
  resolve: { extensions: [".ts", ".js"] },
  module: {
    rules: [
      { test: /\.ts$/, loader: "awesome-typescript-loader", exclude: "/node_modules/" },
    ],
  },
  output: {
    filename: `dist/${packageName}.js`,
    libraryTarget: "umd",
    library: libraryName,
  },
  plugins: [
    new webpack.DefinePlugin({
      "process.env": {
        NODE_ENV: JSON.stringify("production"),
      },
    }),
  ],
};

const minified = {
  ...{},
  ...config,
  ...{
    output: {
      ...{},
      ...config.output,
      ...{
        filename: `dist/${packageName}.min.js`,
      },
    },
    optimization: {
      minimizer: [
        new UglifyJsPlugin({
          uglifyOptions: {
            output: {
              comments: false,
            },
            sourceMap: false,
          },
        }),
      ],
    },
  },
};

// @TODO let webpack run configurations in parallel after solving:
// https://github.com/s-panferov/awesome-typescript-loader/issues/323
module.exports = useMinification
  ? minified
  : config;