getCategoryChildren example

LandingPageEvents::LANDING_PAGE_INDEXER_EVENT => 'updateLandingPageUrls',
            EntityWrittenContainerEvent::class => 'detectSalesChannelEntryPoints',
        ];
    }

    public function updateCategoryUrls(CategoryIndexerEvent $event): void
    {
        if (\in_array(self::CATEGORY_SEO_URL_UPDATER, $event->getSkip(), true)) {
            return;
        }

        $ids = array_merge(array_values($event->getIds()), $this->getCategoryChildren($event->getIds()));

        $this->seoUrlUpdater->update(NavigationPageSeoUrlRoute::ROUTE_NAME, $ids);
    }

    public function updateProductUrls(ProductIndexerEvent $event): void
    {
        if (\in_array(self::PRODUCT_SEO_URL_UPDATER, $event->getSkip(), true)) {
            return;
        }

        $this->seoUrlUpdater->update(ProductPageSeoUrlRoute::ROUTE_NAME, array_values($event->getIds()));
    }