Try Rector Online | Rector - Automated Way to Instantly Upgrade and Refactor any PHP code

Input Code

<?php

final class DemoFile
{
    public function run()
    {
        return 5;

        // we never get here
        return 10;
    }
}

Config rector.php

<?php

use Rector\Php74\Rector\Property\TypedPropertyRector;
use Rector\Set\ValueObject\SetList;
use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;

return static function (ContainerConfigurator $containerConfigurator): void {
    $parameters = $containerConfigurator->parameters();
    $services = $containerConfigurator->services();

    // A. run whole set
    $containerConfigurator->import(SetList::DEAD_CODE);

    // B. or single rule
    $services->set(TypedPropertyRector::class);
};