webpack.config.js

const path = require('path');
const TerserPlugin = require('terser-webpack-plugin');

module.exports = {
   // entry is the "main" source file we want to include/import
   entry: "./src/index.js",
   // output tells webpack where to put the bundle it creates
   output: {
      // in the case of a "plain global browser library", this
      // will be used as the reference to our module that is
      // hung off of the window object.
      library: "peasy",
      // We want webpack to build a UMD wrapper for our module
      libraryTarget: "umd",
      // the destination file name
      filename: "peasy.js",
      globalObject: "this",
      path: path.resolve(__dirname, 'dist') // Output directory
   },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env']
          }
        }
      }
    ]
  },
   optimization: {
    minimize: true,
    minimizer: [new TerserPlugin()]
  }
};