Adjust config to ensure react is compiled with production code only

Author: erwstout

webpack.config.js

@@ -27,12 +27,8 @@ module.exports = env => {
       ]
     },
     plugins: [
+      env.production ? new webpack.DefinePlugin({"process.env": {NODE_ENV: JSON.stringify("production")}}) : '',
       env.production ? new webpack.optimize.UglifyJsPlugin() : '',
-      new webpack.DefinePlugin({
-      "process.env": {
-         NODE_ENV: JSON.stringify("production")
-       }
-    }),
     ]
   }
 };