__proto__ trick to make instanceof work on cloned objects

ljharb · Aug 19, 2010 · 130a833 · 130a833
1 parent 2a1f530
commit 130a833
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/lib/traverse.js b/lib/traverse.js
@@ -11,6 +11,9 @@ function Traverse (refObj) {
             Object.keys(ref).forEach(function (key) {
                 node[key] = clone(ref[key]);
             });
+            // To make instanceof work:
+            if ('__proto__' in ref) node.__proto__ = ref.__proto__;
+            // Probably there are other attributes worth copying
             return node;
         }
         else {