add descriptor falsy check to defaults helper - #739

2015-02-10 18:33:29 +11:00
parent 4fa9aa63a3
commit 7f61c8b65e
7 changed files with 7 additions and 7 deletions
--- a/lib/6to5/transformation/templates/defaults.js
+++ b/lib/6to5/transformation/templates/defaults.js
@@ -3,7 +3,7 @@
  for (var i = 0; i < keys.length; i++) {
    var key = keys[i];
    var value = Object.getOwnPropertyDescriptor(defaults, key);
-    if (value.configurable && obj[key] === undefined) {
+    if (value && value.configurable && obj[key] === undefined) {
      Object.defineProperty(obj, key, value);
    }
  }