MenuLinkDepthConstraint.php

<?php

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

use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\Validation\Attribute\Constraint;
use Drupal\Core\Validation\Plugin\Validation\Constraint\RangeConstraint;

/**
 * Validates the link depth of a menu tree.
 */
class MenuLinkDepthConstraint extends RangeConstraint {
    
    /**
     * The initial level of menu items that are being exposed (zero-based).
     *
     * @var string|int
     */
    public string|int $baseLevel = 0;

}