webpack.config.js

const path = require('path');
const nodeExternals = require('webpack-node-externals');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const pkg = require('./package.json');

let libraryName = pkg.name;

module.exports = {
  entry: './index.js',
  devtool: 'source-map',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'index.js',
    library: libraryName,
    libraryTarget: 'umd',
    umdNamedDefine: true
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            babelrc: true
          }
        }
      }
    ]
  },
  target: 'node', // in order to ignore built-in modules like path, fs, etc.
  externals: [nodeExternals()], // in order to ignore all modules in node_modules folder

  stats: {
    colors: true
  },
  plugins: [new UglifyJsPlugin({ sourceMap: true })]
};