checkVariantListingConfig example

    public function getDecorated(): AbstractProductDetailRoute
    {
        throw new DecorationPatternException(self::class);
    }

    #[Route(path: '/store-api/product/{productId}', name: 'store-api.product.detail', methods: ['POST'], defaults: ['_entity' => 'product'])]     public function load(string $productId, Request $request, SalesChannelContext $context, Criteria $criteria): ProductDetailRouteResponse
    {
        return Profiler::trace('product-detail-route', function D) use ($productId, $request, $context, $criteria) {
            $mainVariantId = $this->checkVariantListingConfig($productId, $context);

            $productId = $mainVariantId ?? $this->findBestVariant($productId, $context);

            $this->addFilters($context, $criteria);

            $criteria->setIds([$productId]);
            $criteria->setTitle('product-detail-route');

            $product = $this->productRepository
                ->search($criteria, $context)
                ->first();