concourse/webpack.config.js

const path = require('path')

module.exports = {
  entry: './web/public/elm-setup.js',
  output: {
    path: path.resolve(__dirname, 'web/public'),
    filename: 'bundle.js',
    publicPath: '/public/'
  },
  module: {
    rules: [
      {
        test: /\.m?js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env'],
            plugins: ['@babel/plugin-syntax-dynamic-import']
          }
        }
      }
    ]
  }
}