trait BundleDestinationOptionsTrait in Field tools 8

trait BundleDestinationOptionsTrait {

  /**
   * Gets the options for the destination entity types and bundles form element.
   *
   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
   *   The entity type manager.
   * @param \Drupal\Core\Entity\EntityTypeBundleInfoInterface $entity_type_bundle_info
   *   The entity type bundle info service.
   *
   * @return
   *  An array of Form API options.
   */
  protected function getDestinationOptions(EntityTypeManagerInterface $entity_type_manager, EntityTypeBundleInfoInterface $entity_type_bundle_info) {
    $entity_types = $entity_type_manager
      ->getDefinitions();
    $bundles = $entity_type_bundle_info
      ->getAllBundleInfo();
    $destination_options = [];
    foreach ($entity_types as $entity_type_id => $entity_type) {

      // Only consider fieldable entity types.
      // As we're working with fields in the UI, only consider entity types that
      // have a field UI.
      if (!$entity_type
        ->get('field_ui_base_route')) {
        continue;
      }
      $entity_type_label = $entity_type
        ->getLabel();
      foreach ($bundles[$entity_type_id] as $bundle_id => $bundle_info) {

        // The option key for this entity type and bundle.
        $option_key = "{$entity_type_id}::{$bundle_id}";
        $destination_options[$option_key] = $entity_type_label . ' - ' . $bundle_info['label'];
      }
    }
    natcasesort($destination_options);
    return $destination_options;
  }

}