code: function notifyRetroactively(object) {
    if (object && typeof object === 'object') {
      const type = 'add';
      var notifier = Object.getNotifier(object);
      keys(object).forEach(name => notifier.notify({type, name, object}));
    }
    return object;
  }
docs: Retroactively notify 'add' to all properties in an object.