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');
            }
        }
    }

}