(function set(object, property, value, receiver) { var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent !== null) { return set(parent, property, value, receiver); } } else if ("value" in desc && desc.writable) { return desc.value = value; } else { var setter = desc.set; if (setter !== undefined) { return setter.call(receiver, value); } } });