text: var webpack = require('webpack');
  const merge = require('webpack-merge');
  const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
  const common = require('./webpack.common.js');
  
  module.exports = merge(common, {
      devtool: 'cheap-module-source-map',
      plugins: [
          new UglifyJSPlugin({
              sourceMap: true
          }),
          new webpack.DefinePlugin({
              'process.env': {
                  'NODE_ENV': JSON.stringify(process.env.NODE_ENV)
              }
          })
      ]
  });