ImageProvider.php

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<?php
namespace Magento\Checkout\Model\Cart;

use Magento\Checkout\CustomerData\DefaultItem;
use Magento\Framework\App\ObjectManager;

class ImageProvider
{
    protected $itemRepository;

    protected $itemPool;

    protected $customerDataItem;

    public function __construct(
        \Magento\Quote\Api\CartItemRepositoryInterface $itemRepository,
        \Magento\Checkout\CustomerData\ItemPoolInterface $itemPool,
        \Magento\Checkout\CustomerData\DefaultItem $customerDataItem = null
    ) {
        $this->itemRepository = $itemRepository;
        $this->itemPool = $itemPool;
        $this->customerDataItem = $customerDataItem ?: ObjectManager::getInstance()->get(DefaultItem::class);
    }

    public function getImages($cartId)
    {
        $itemData = [];

        $items = $this->itemRepository->getList($cartId);
        foreach ($items as $cartItem) {
            $allData = $this->customerDataItem->getItemData($cartItem);
            $itemData[$cartItem->getItemId()] = $allData['product_image'];
        }
        return $itemData;
    }
}