registerEntityExtensions example

$featureFlags = $this->container->getParameter('shopware.feature.flags');
        if (!\is_array($featureFlags)) {
            throw new \RuntimeException('Container parameter "shopware.feature.flags" needs to be an array');
        }
        Feature::registerFeatures($featureFlags);

        $cacheDir = $this->container->getParameter('kernel.cache_dir');
        if (!\is_string($cacheDir)) {
            throw new \RuntimeException('Container parameter "kernel.cache_dir" needs to be a string');
        }

        $this->registerEntityExtensions(
            $this->container->get(DefinitionInstanceRegistry::class),
            $this->container->get(SalesChannelDefinitionInstanceRegistry::class),
            $this->container->get(ExtensionRegistry::class)
        );

        \assert($this->container instanceof ContainerInterface, 'Container is not set yet, please call setContainer() before calling boot(), see `src/Core/Kernel.php:186`.');

        CacheValueCompressor::$compress = $this->container->getParameter('shopware.cache.cache_compression');
    }

    /** * @return string[] */