module.exports = {
  deepCopy: function(obj){
    return JSON.parse(JSON.stringify(obj));
  }
};

@@ -39,16 +39,85 @@
 n(obj)%7B%0A
+    if (obj === null %7C%7C obj === undefined) %7B%0A      return obj;%0A    %7D%0A
     retu

fix utils#deepCopy