webpack.config.js

const webpack = require('webpack');

const plugins = [
  new webpack.DefinePlugin({
    ENV: JSON.stringify({
      CLIENT: true,
      SERVER: false
    }),
    'process.env.NODE_ENV': JSON.stringify('production')
  })
];

plugins.push(new webpack.optimize.UglifyJsPlugin({
    include: /\.js$/,
    mangle: true,
    comments: false,
    compress: {
      warnings: true
    },
    minimize: true
  }));

module.exports = [
  {
      entry: "./index.js",
      target: 'node',
      plugins: plugins,
      output: {
          path: __dirname,
          filename: "bundle.js"
      }
  },
  {
      entry: "./index.js",
      target: 'node',
      resolve: {
        alias: {
          'react$': 'react/dist/react.min.js',
          'react-dom/server$': 'react-dom/dist/react-dom-server.min.js'
        }
      },
      output: {
          path: __dirname,
          filename: "bundle.react-min.js"
      }
  }
];