extendCriteria example

$categoryCriteria = new Criteria([$categoryId]);
        $categoryCriteria->setTitle('product-listing-route::category-loading');
        $categoryCriteria->addFields(['productAssignmentType', 'productStreamId']);
        $categoryCriteria->setLimit(1);

        /** @var PartialEntity|null $category */
        $category = $this->categoryRepository->search($categoryCriteria, $context->getContext())->first();
        if (!$category) {
            throw ProductException::categoryNotFound($categoryId);
        }

        $this->extendCriteria($context, $criteria, $category);

        $entities = $this->listingLoader->load($criteria, $context);

        $result = ProductListingResult::createFrom($entities);
        $result->addState(...$entities->getStates());

        $result->setStreamId($category->get('productStreamId'));

        return new ProductListingRouteResponse($result);
    }