ProductCollectionStockCondition.php

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<?php
namespace Magento\CatalogInventory\Model;

use Magento\Catalog\Model\CollectionConditionInterface;
use Magento\Eav\Model\Entity\Collection\AbstractCollection;
use Magento\Framework\Data\Collection\AbstractDb;
use Magento\Framework\Data\CollectionModifierInterface;

class ProductCollectionStockCondition implements CollectionModifierInterface
{
    private $stockHelper;

    public function __construct(\Magento\CatalogInventory\Helper\Stock $stockHelper)
    {
        $this->stockHelper = $stockHelper;
    }

    public function apply(AbstractDb $collection)
    {
        $this->stockHelper->addIsInStockFilterToCollection($collection);
    }
}