webpack.config.js

const HtmlWebpackPlugin = require('html-webpack-plugin');
const HtmlWebpackInlineSourcePlugin = require('html-webpack-inline-source-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin')

module.exports = {
  entry: {
    'viamapi-client': ['core-js/fn/promise', './src/viamapi-client.js'],
    'viamapi-iframe': ['babel-polyfill', './src/iframe/viamapi-iframe.js'],
  },
  plugins: [
    new HtmlWebpackPlugin({  // Also generate a test.html
      filename: 'viamapi-iframe.html',
      template: 'src/iframe/viamapi-iframe.html',
      chunks: ['viamapi-iframe'],
      inlineSource: '.(js)$'
    }),
    new CleanWebpackPlugin(),
    new HtmlWebpackInlineSourcePlugin()
  ],
  module: {
    rules: [
      {
        test: /\.m?js$/,
        // We have to transpile every dependency to make it work for older browsers. (IE 11)
        //exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env']
          }
        }
      }
    ]
  }
};