PreventDeletingAssignedToSalesChannelsStockPlugin.php

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<?php
declare(strict_types=1);

namespace Magento\InventorySales\Plugin\InventoryApi\StockRepository;

use Magento\Framework\Exception\CouldNotDeleteException;
use Magento\InventoryApi\Api\StockRepositoryInterface;
use Magento\InventorySalesApi\Model\GetAssignedSalesChannelsForStockInterface;

class PreventDeletingAssignedToSalesChannelsStockPlugin
{
    private $assignedSalesChannelsForStock;

    public function __construct(
        GetAssignedSalesChannelsForStockInterface $assignedSalesChannelsForStock
    ) {
        $this->assignedSalesChannelsForStock = $assignedSalesChannelsForStock;
    }

    public function beforeDeleteById(StockRepositoryInterface $subject, int $stockId)
    {
        $assignSalesChannels = $this->assignedSalesChannelsForStock->execute($stockId);
        if (count($assignSalesChannels)) {
            throw new CouldNotDeleteException(__('Stock has at least one sale channel and could not be deleted.'));
        }
    }
}