class FinalMissingContentSubscriber

class FinalMissingContentSubscriber implements EventSubscriberInterface {
  
  /**
   * Handles the missing content event.
   *
   * @param \Drupal\Core\Config\Importer\MissingContentEvent $event
   *   The missing content event.
   */
  public function onMissingContent(MissingContentEvent $event) {
    foreach (array_keys($event->getMissingContent()) as $uuid) {
      $event->resolveMissingContent($uuid);
    }
  }
  
  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    // This should always be the final event as it will mark all content
    // dependencies as resolved.
    $events[ConfigEvents::IMPORT_MISSING_CONTENT][] = [
      'onMissingContent',
      -1024,
    ];
    return $events;
  }

}