/**
  * {@inheritdoc}
  */
 public function calculateDependencies()
 {
     parent::calculateDependencies();
     $view_modes = $this->configuration['view_mode'];
     foreach ($this->index->getDatasources() as $datasource_id => $datasource) {
         if ($entity_type_id = $datasource->getEntityTypeId() && !empty($view_modes[$datasource_id])) {
             foreach ($view_modes[$datasource_id] as $view_mode) {
                 if ($view_mode) {
                     /** @var \Drupal\Core\Entity\EntityViewModeInterface $view_mode_entity */
                     $view_mode_entity = EntityViewMode::load($entity_type_id . '.' . $view_mode);
                     if ($view_mode_entity) {
                         $this->addDependency($view_mode_entity->getConfigDependencyKey(), $view_mode_entity->getConfigDependencyName());
                     }
                 }
             }
         }
     }
     return $this->dependencies;
 }