ExtensionExistsConstraint.php

<?php

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

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

/**
 * Checks that the value is the name of an installed extension.
 */
class ExtensionExistsConstraint extends SymfonyConstraint {
    
    /**
     * The error message for a non-existent module.
     *
     * @var string
     */
    public string $moduleMessage = "Module '@name' is not installed.";
    
    /**
     * The error message for a non-existent theme.
     *
     * @var string
     */
    public string $themeMessage = "Theme '@name' is not installed.";
    
    /**
     * The type of extension to look for. Can be 'module' or 'theme'.
     *
     * @var string
     */
    public string $type;
    
    /**
     * {@inheritdoc}
     */
    public function getRequiredOptions() : array {
        return [
            'type',
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDefaultOption() : ?string {
        return 'type';
    }

}