webpack es3 (for picky JS engines)

webpack.config.js

const path = require('path');
// const UnminifiedWebpackPlugin = require('unminified-webpack-plugin'); // for webpack 3 / 4.x
const ReplaceInFileWebpackPlugin = require('replace-in-file-webpack-plugin');
const GasPlugin = require('gas-webpack-plugin'); // for google-app-scripts
const { ProvidePlugin } = require('webpack');
const debug = require('./debug').spawn('webpack');

module.exports = {
  entry: './index.js',
  output: {
    // libraryTarget: 'this',
    path: path.resolve(__dirname, 'dist'),
    filename: 'main.js' // webpack 2
    // filename: 'main.min.js' // for webpack 3 /4 w UnminifiedWebpackPlugin
  },
  plugins: [
    // new UnminifiedWebpackPlugin(),
    // new ProvidePlugin({
    //   Promise: require('es6-promise/auto')
    // }),
    new GasPlugin(),
    new ReplaceInFileWebpackPlugin([
      {
        dir: 'dist',
        test: /\.js$/,
        rules: [
          // fix promise initialize for es6-promises to not throw errors in debugger
          // this is to resolve GAppScript debugger hell (stops on all exceptions.. handled or not)
          {
            search: /if \(isNode\)(.|\n)*useSetTimeout\(\);\n.*\}/,
            replace: 'scheduleFlush = useSetTimeout();'
          }
        ]
      }
    ])
  ],
  module: {
    rules: [
      {
        test: /\.js$/,
        use: {
          loader: 'babel-loader',
          options: {
            // it should read babelrc.. but it is not!!
            presets: ['env'],
            plugins: [
              'transform-object-assign',
              'transform-class-properties',
              'transform-object-rest-spread',
              'lodash',
              'transform-es3-member-expression-literals',
              'transform-es3-property-literals'
            ].map(plug => require(`babel-plugin-${plug}`))
          }
        }
      }
    ]
  }
};

Not using transform-runtime and bluebird promises on purpose. They do not play well on google app scripts.

https://github.com/stefanpenner/es6-promise

Does seem to work.

For google I should add an Regex to search for https://github.com/stefanpenner/es6-promise/blob/90c0595230b2caa23eefdf9da3480322dbf4edf7/lib/es6-promise/asap.js#L109-L119

and force useSetTimeout() as attemptVertx() causes annoying auto breakpointing in google app scripts.