MediaMappingsConstraint.php

<?php

namespace Drupal\media\Plugin\Validation\Constraint;

use Drupal\Core\Validation\Attribute\Constraint;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Symfony\Component\Validator\Constraint as SymfonyConstraint;

/**
 * Validates media mappings.
 *
 * @internal
 */
class MediaMappingsConstraint extends SymfonyConstraint {
    
    /**
     * The error message if source is used in media mapping.
     *
     * @var string
     */
    public string $invalidMappingMessage = 'It is not possible to map the source field @source_field_name of a media type.';

}