ctools-8.x-3.x-dev/src/Plugin/Deriver/TypedDataEntityRelationshipDeriver.php

<?php

namespace Drupal\ctools\Plugin\Deriver;

use Drupal\Core\TypedData\DataDefinitionInterface;

/**
 *
 */
class TypedDataEntityRelationshipDeriver extends TypedDataRelationshipDeriver {

  /**
   * {@inheritdoc}
   */
  protected $label = '@property Entity from @base';

  /**
   * {@inheritdoc}
   */
  protected function generateDerivativeDefinition($base_plugin_definition, $data_type_id, $data_type_definition, DataDefinitionInterface $base_definition, $property_name, DataDefinitionInterface $property_definition) {
    if (method_exists($property_definition, 'getType') && $property_definition->getType() == 'entity_reference') {
      parent::generateDerivativeDefinition($base_plugin_definition, $data_type_id, $data_type_definition, $base_definition, $property_name, $property_definition);

      // Provide the entity type.
      $derivative_id = $data_type_id . ':' . $property_name;
      if (isset($this->derivatives[$derivative_id])) {
        $this->derivatives[$derivative_id]['target_entity_type'] = $property_definition->getFieldStorageDefinition()->getPropertyDefinition('entity')->getConstraint('EntityType');
      }
    }
  }

}