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