trait PageBreadcrumbsFormTrait in Panels Breadcrumbs 8

trait PageBreadcrumbsFormTrait {

  /**
   * Get panels breadcrumbs settings keys.
   */
  public static function getSettingsKeys() {
    return [
      'state',
      'titles',
      'paths',
      'home',
      'home_text',
    ];
  }

  /**
   * Get types of tokens based on contexts.
   */
  public static function getTypesOfTokens(PageVariantInterface $page_variant) {
    $types = [];
    foreach ($page_variant
      ->getContexts() as $id => $context) {
      if ($type = \Drupal::service('token.entity_mapper')
        ->getTokenTypeForEntityType($id)) {
        $types[] = $type;
      }
    }
    return $types;
  }

}