new version of extend

lib/errors/index.js

@@ -25,6 +25,7 @@ var traverseNode = function(parent, errorDefinition) {
   if (errorDefinition.errors) {
     childDefinitions(NodeError, errorDefinition.errors);
   }
+  return NodeError;
 };
 
 /* jshint latedef: false */
@@ -56,6 +57,5 @@ traverseRoot(bitcore.Error, data);
 module.exports = bitcore.Error;
 
 module.exports.extend = function(spec) {
-  traverseNode(bitcore.Error, spec);
+  return traverseNode(bitcore.Error, spec);
-  return bitcore.Error;
 };