Edit File: ConfiguratorTrait.php
<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\DependencyInjection\Loader\Configurator\Traits; trait ConfiguratorTrait { /** * Sets a configurator to call after the service is fully initialized. * * @param string|array $configurator A PHP callable reference * * @return $this */ final public function configurator($configurator): self { $this->definition->setConfigurator(static::processValue($configurator, true)); return $this; } }