rector/src/DependencyInjection/Loader/Configurator/RectorServiceConfigurator.php

<?php

declare(strict_types=1);

namespace Rector\Core\DependencyInjection\Loader\Configurator;

use Rector\Core\Configuration\ValueObjectInliner;
use Rector\Core\Contract\Rector\ConfigurableRectorInterface;
use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
use Symfony\Component\DependencyInjection\Loader\Configurator\ServiceConfigurator;

/**
 * @api
 * Same as Symfony service configurator, with extra "configure()" method for easier DX
 */
final class RectorServiceConfigurator extends ServiceConfigurator
{
    /**
     * @deprecated Use @see \Rector\Config\RectorConfig instead
     * @param mixed[] $configuration
     */
    public function configure(array $configuration): self
    {
        $this->ensureClassIsConfigurable($this->id);

        // decorate with value object inliner so Symfony understands, see https://getrector.org/blog/2020/09/07/how-to-inline-value-object-in-symfony-php-config
        array_walk_recursive($configuration, function (&$value) {
            if (is_object($value)) {
                $value = ValueObjectInliner::inline($value);
            }

            return $value;
        });

        $this->call('configure', [$configuration]);

        return $this;
    }

    private function ensureClassIsConfigurable(?string $class): void
    {
        if ($class === null) {
            throw new InvalidConfigurationException('The class is missing');
        }

        if (! is_a($class, ConfigurableRectorInterface::class, true)) {
            $errorMessage = sprintf(
                'The service "%s" is not configurable. Make it implement "%s" or remove "configure()" call.',
                $class,
                ConfigurableRectorInterface::class,
            );
            throw new InvalidConfigurationException($errorMessage);
        }
    }
}