webpack.config.js

const isDev = process.env.NODE_ENV === 'development'

module.exports = {
  mode: isDev ? 'development' : 'production',
  entry: [
    '@babel/polyfill', // enables async-await
    './client/index.js'
  ],
  output: {
    path: __dirname,
    filename: './public/bundle.js'
  },
  resolve: {
    extensions: ['.js', '.jsx']
  },
  devtool: 'source-map',
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        loader: 'babel-loader'
      },
      {
        test: /\.(png|svg|jpg|gif)$/,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: '[path][name]-[hash:8].[ext]',
              outputPath: 'public',
              publicPath: '/'
            }
          }
        ]
      }
    ]
  }
}