/**
  * @param FieldWidgetDefinitionInterface $fieldWidgetDefinition
  * @param array                          $options
  *
  * @return array
  */
 protected function resolveFieldWidgetOptions(FieldWidgetDefinitionInterface $fieldWidgetDefinition, array $options)
 {
     $resolver = new OptionsResolver();
     $resolver->setDefaults(['default' => null]);
     $fieldWidgetDefinition->setOptions($resolver, $options);
     return $resolver->resolve($options);
 }