webpack.config.js

const path = require('path')
const webpack = require('webpack')
const fs = require('fs')

const nodeModules = {}
fs.readdirSync('node_modules')
  .filter(function (x) {
    return ['.bin'].indexOf(x) === -1
  })
  .forEach(function (mod) {
    nodeModules[mod] = 'commonjs ' + mod
  })

module.exports = {
  mode: 'development',
  entry: './src/index.js',

  output: {
    filename: 'index.js',
    path: path.resolve(__dirname, '.')
  },

  externals: nodeModules,

  target: 'node',

  plugins: [new webpack.ProgressPlugin()],

  module: {
    rules: [
      {
        test: /.(js|jsx)$/,
        include: [path.resolve(__dirname, 'src')],
        loader: 'babel-loader',
        exclude: /\node_modules/,

        options: {
          plugins: ['syntax-dynamic-import'],

          presets: [
            [
              '@babel/preset-env',
              {
                modules: false
              }
            ]
          ]
        }
      }
    ]
  },

  optimization: {
    splitChunks: {
      cacheGroups: {
        vendors: {
          priority: -10,
          test: /[\\/]node_modules[\\/]/
        }
      },

      chunks: 'async',
      minChunks: 1,
      minSize: 30000,
      name: true
    }
  }
}