<?php
final class LivestreamTopicItemsCleaner extends AbstractVideoItemCleaner
{
    public function __construct(private readonly EntityManagerInterface $em, LoggerInterface $logger)
    {
        parent::__construct($em, $logger);
    }
 
    protected function foobar(): array
    {
        $this->em->clear(); // demonstrate usage
    }
}

abstract class AbstractVideoItemCleaner
{
    public function __construct(
        private readonly EntityManagerInterface $em,
        private readonly LoggerInterface $logger,
    ) {
    }
}