webpack.config.js

const path = require('path');
const nodeExternals = require('webpack-node-externals');

const config = {
  // target environment
  target: 'node',
  // To use relative path on entry
  context: path.resolve(__dirname, 'src'),
  // SPA: single entry, MPA: multiple entries
  entry: {
    app: [
      'babel-polyfill', // ISSUE: Add babel-polyfill dev dependency to fix 'regeneratorRuntime is not defined' error.
      './index.js',
    ],
  },
  // enable default plugins for the environment
  mode: process.env.WEBPACK_ENV,
  // generate source map for debugging
  devtool: 'source-map',
  // translate es6 with babel
  module: {
    rules: [
      {
        test: /\.(js)$/,
        exclude: /node_modules/,
        use: [
          'babel-loader',
          'eslint-loader',
        ],
      },
    ],
  },
  // excluding nodejs dependencies from the output
  externals: [
    nodeExternals(),
  ],
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'bundle.js',
  },
};

module.exports = config;