webpack.config.js

const webpack = require('webpack');
const path = require('path');

module.exports = {
  entry: [
    path.join(__dirname, '/client/app.jsx'),
  ],
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /(node_modules)/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-react', '@babel/preset-env'],
            plugins: ['@babel/plugin-transform-class-properties']
          }
        }
      },
    ],
  },
  output: {
    path: path.join(__dirname, 'public'),
    filename: 'bundle.js',
  },
  resolve: {
    extensions: ['.jsx', '.js'],
  },
  devServer: {
    static: {
      directory: path.join(__dirname, 'public'),
    },
    devMiddleware: {
      index: false, // specify to enable root proxying
    },
    proxy: [
      {
        context: ['/'],
        target: 'http://localhost:3000',
      }
    ]
  }
};