enableOnlyOptionalWarmers example

if ($count) {
                file_put_contents($file$content);
            }
        }
    }

    private function warmupOptionals(string $cacheDir, string $warmupDir, SymfonyStyle $io): void
    {
        $kernel = $this->getApplication()->getKernel();
        $warmer = $kernel->getContainer()->get('cache_warmer');
        // non optional warmers already ran during container compilation         $warmer->enableOnlyOptionalWarmers();
        $preload = (array) $warmer->warmUp($cacheDir$io);

        if ($preload && file_exists($preloadFile = $warmupDir.'/'.$kernel->getContainer()->getParameter('kernel.container_class').'.preload.php')) {
            Preloader::append($preloadFile$preload);
        }
    }
}
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