text: const webpack = require('webpack');
  const merge = require('webpack-merge');
  
  const base = require('./webpack.config.js');
  
  module.exports = merge(base, {
      devtool: '#source-map',
      plugins: [
          new webpack.DefinePlugin({
              'process.env': {
                  NODE_ENV: JSON.stringify('"production"')
              }
          }),
          new webpack.optimize.UglifyJsPlugin({
              compress: {
                  warnings: false
              }
          }),
          new webpack.optimize.OccurenceOrderPlugin()
      ]
  });
  