deferral.js/webpack.config.js

Mange your async task more easy.

var path = require('path');

var config = {
  entry: './src/deferral.js',
  output: {
    filename: 'index.js',
    path: path.resolve(__dirname, 'lib')
  },
};

var legacyConfig = Object.assign({}, config, {
  output: {
    filename: 'index.legacy.js',
    path: path.resolve(__dirname, 'lib')
  },
  module: {
    loaders: [
      {
        test: /\.js$/,
        exclude: /(node_modules|bower_components)/,
        loader: 'babel-loader',
        query: {
          presets: ['env']
        }
      }
    ]
  }
});

module.exports = [config, legacyConfig];