webpack.config.js

const path = require('path');

const SRC_DIR = path.join(__dirname, '/client');
const DIST_DIR = path.join(__dirname, '/dist');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;

module.exports = {
  entry: ['babel-polyfill', `${SRC_DIR}/index.jsx`],
  output: {
    filename: 'bundle.js',
    path: DIST_DIR
  },
  module: {
    rules: [
      {
        test: /\.js?/,
        exclude: /node_modules/,
        include: SRC_DIR,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env', '@babel/preset-react']
          }
        }
      }
    ]
  },
  resolve: {
    extensions: ['.js', '.jsx', '.json']
  },
  plugins: [
    new BundleAnalyzerPlugin()
  ],
};