Issue #3263663 by grndlvl: Error: Call to undefined method...

use Drupal\Core\Entity\EntityStorageInterface;

use Drupal\Core\Field\FieldDefinitionInterface;

use Drupal\Core\Field\FieldItemListInterface;

use Drupal\Core\Field\TypedData\FieldItemDataDefinition;

use Drupal\Core\Field\Plugin\Field\FieldFormatter\EntityReferenceFormatterBase;

use Drupal\Core\Form\FormStateInterface;

use Drupal\Core\Plugin\ContainerFactoryPluginInterface;

    $facets = $this->facetStorage->loadMultiple();

    $options = [];

    foreach ($facets as $facet) {

      /** @var \Drupal\Core\Field\TypedData\FieldItemDataDefinition $definition */

      $definition = $facet->getDataDefinition($facet->getFieldIdentifier());

      // Ensure that we are only dealing with facets associated with fields.

      if ($definition instanceof FieldItemDataDefinition) {

        $facet_field_name = $definition->getFieldDefinition()->getName();

        // Add a facet to the options only if that facet is faceting this field.

          $options[$facet->id()] = $facet->label();

        }

      }

    }

    $elements['facet'] = [

      '#title' => $this->t('Select the facet to which the labels should be linked.'),