RequiredConstraint.php

<?php

declare (strict_types=1);
namespace Drupal\Core\Validation\Plugin\Validation\Constraint;

use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\Validation\Attribute\Constraint;
use Drupal\Core\Validation\CompositeConstraintInterface;
use Symfony\Component\Validator\Attribute\HasNamedArguments;
use Symfony\Component\Validator\Constraints\Required;

/**
 * Marks a field as required in a Collection constraint.
 */
class RequiredConstraint extends Required implements CompositeConstraintInterface {
  public function __construct(...$args) {
    parent::__construct(...$args);
  }
  
  /**
   * {@inheritdoc}
   */
  public static function getCompositeOptionStatic() : array|string {
    return 'constraints';
  }

}