Webpack with scope hoisting

webpack.config.js

             NODE_ENV: JSON.stringify('production')
         }
     }));
-
+    plugins.push(new webpack.optimize.ModuleConcatenationPlugin());
     plugins.push(new webpack.optimize.UglifyJsPlugin({
         compress: {
-            // It is nice to see warnings from UglifyJsPlugin that something is
-            // unused/removed.
             warnings: true
         },
         extractComments: true,
-
-        // Use the source map to map error message locations to modules.
         sourceMap: true
     }));
 }