webpack.config.js

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

module.exports = {
  entry: {
    'global': './src/app.jsx',
  },
  resolve: {
    extensions: ['.js', '.jsx']
  },
  devtool: 'source-map',
  module: {
    rules: [{
      test: /\.jsx?$/,
      exclude: /node_modules/,
      loader: 'babel-loader',
      query: {
        cacheDirectory: true
      }
    }]
  },
  plugins: [
    new webpack.optimize.UglifyJsPlugin({
      sourceMap: true,
      output: {
        comments: false
      }
    }),
    new webpack.optimize.CommonsChunkPlugin({
      name: 'global',
      minChunks: 2,
      children: true
    }),
    new webpack.optimize.CommonsChunkPlugin({
      name: 'commons',
      minChunks: 2,
      children: true
    }),
    new webpack.DefinePlugin({
      APP_ENV: JSON.stringify('browser')
    })
  ],
  output: {
    path: path.join(__dirname, './public/assets'),
    publicPath: '/assets/',
    filename: '[name].js',
    sourceMapFilename: '[file].map'
  },
};