webpack.config.js

var webpack = require('webpack');
var path = require('path');
var fs = require('fs');

var BUILD_DIR = path.resolve(__dirname, 'public/js');
var APP_DIR = path.resolve(__dirname, 'app');

var config = {
  entry: APP_DIR + '/index.jsx',
  output: {
    path: BUILD_DIR,
    filename: 'bundle.js'
  },
  module : {
    loaders : [
      {
        test : /\.jsx?/,
        include : APP_DIR,
        loader : 'babel-loader'
      },
      { test: /\.json$/, loader: 'json-loader' }
    ]
  },
  resolve: {
    extensions: ['.json', '.jsx', '.js']
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env': {
        'NODE_ENV': JSON.stringify(process.env.NODE_ENV)
      }
    }),
    function () {
      this.plugin('done', function (stats) {
        fs.writeFileSync(
          path.resolve(__dirname, 'public', 'stats.json'),
          JSON.stringify({
            hash: stats.hash
          })
        );
      })
    }
  ],
  node: {
    console: true,
    fs: 'empty',
    net: 'empty',
    tls: 'empty'
  }
};

module.exports = config;