rector/src/DependencyInjection/CompilerPass/DeprecationWarningCompilerPass.php

<?php

declare(strict_types=1);

namespace Rector\Core\DependencyInjection\CompilerPass;

use Rector\Core\Configuration\Option;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;

final class DeprecationWarningCompilerPass implements CompilerPassInterface
{
    /**
     * @var array<string, string>
     */
    private const DEPRECATED_PARAMETERS = [
        Option::SETS => 'Use $containerConfigurator->import(<set>); instead',
    ];

    public function process(ContainerBuilder $containerBuilder): void
    {
        $parametersBag = $containerBuilder->getParameterBag();

        foreach (self::DEPRECATED_PARAMETERS as $parameter => $message) {
            if (! $parametersBag->has($parameter)) {
                continue;
            }

            $setsParameters = $parametersBag->get($parameter);
            if ($setsParameters === []) {
                continue;
            }

            $message = sprintf('The "%s" parameter is deprecated. %s', $parameter, $message);
            trigger_error($message);
            // to make it noticable
            sleep(2);
        }
    }
}