magento2 find products in stock

<?php
//n98-magerun2.phar dev:console

#useful for old multi-stock implementation for magento
        #but can be skipped
        $stockId = 7;
        $storeId = 3;

        $objectManager = \Magento\Framework\App\ObjectManager::getInstance();

        /** @var \Magento\Framework\Indexer\IndexerRegistry $indexRegistry */
//$indexRegistry =  $objectManager->create('\Magento\Framework\Indexer\IndexerRegistry');
//
//$productFlatIndexer = $indexRegistry->get('catalog_product_flat');
//$indexRegistry->getIndexesZ();
//$productFlatIndexer->invalidate();

        /** @var \Magento\Catalog\Model\ResourceModel\Product\Collection $productCollection */
        $productCollection = $objectManager->create('Magento\Catalog\Model\ResourceModel\Product\Collection');

        $myClassReflection = new ReflectionClass(get_class($productCollection));
        $secret = $myClassReflection->getProperty('_flatEnabled');
        $secret->setAccessible(true);

        $flat  = $secret->getValue($productCollection);
        $flat[$storeId] = false;
        $secret->setValue($productCollection,$flat);


        /** @var \Magento\Catalog\Model\ResourceModel\Product\Collection $collection */
        $collection = $productCollection;
        $collection->setStoreId($storeId);


        /**
         * visibility always adds joins  with cat_index
         * @see \Magento\Catalog\Model\ResourceModel\Product\Collection::_productLimitationJoinStore()
         *
         */
        //
        $collection->setVisibility([2,4]);

        //if you do not set this filter because of join with cat_index you will get duplicate product_id
        $collection->addStoreFilter($storeId);


        /**
         * multi-inventory
         * @var \Magento\CatalogInventory\Helper\Stock $stockFilter
         * */
        $stockFilter = $objectManager->create('\Magento\CatalogInventory\Helper\Stock');

        $stockFilter->addInStockFilterToCollection($collection);
        $from =  $collection->getSelect()->getPart('from');
        $bAddInventory =isset($from['at_inventory_in_stock']) && !empty($stockId);
        $bAddInventory && $collection->getSelect()->where('at_inventory_in_stock.stock_id = ?',$stockId);
//        return        (string) $collection->getSelect();
        $collection->setPageSize(100);
        return $collection->count();