fix defaults helper in strict mode - #738

2015-02-09 20:38:57 -08:00
parent 825d84ba52
commit c6920a0e60
7 changed files with 9 additions and 8 deletions
--- a/lib/6to5/transformation/templates/defaults.js
+++ b/lib/6to5/transformation/templates/defaults.js
@@ -2,8 +2,9 @@
  var keys = Object.getOwnPropertyNames(defaults);
  for (var i = 0; i < keys.length; i++) {
    var key = keys[i];
-    if (obj[key] === undefined) {
-      Object.defineProperty(obj, key, Object.getOwnPropertyDescriptor(defaults, key));
+    var value = Object.getOwnPropertyDescriptor(defaults, key);
+    if (value.configurable && obj[key] === undefined) {
+      Object.defineProperty(obj, key, value);
    }
  }
  return obj;