EntityTestConstraintsHooks.php

<?php

declare (strict_types=1);
namespace Drupal\entity_test_constraints\Hook;

use Drupal\Core\Hook\Attribute\Hook;

/**
 * Hook implementations for entity_test_constraints.
 */
class EntityTestConstraintsHooks {
    
    /**
     * Implements hook_entity_type_build().
     */
    public function entityTypeBuild(array &$entity_types) {
        if ($extra = \Drupal::state()->get('entity_test_constraints.build')) {
            foreach ($extra as $id => $option) {
                $entity_types['entity_test_constraints']->addConstraint($id, $option);
            }
        }
    }
    
    /**
     * Implements hook_entity_type_alter().
     */
    public function entityTypeAlter(array &$entity_types) : void {
        if ($alter = \Drupal::state()->get('entity_test_constraints.alter')) {
            $entity_types['entity_test_constraints']->setConstraints($alter);
        }
    }

}