Label.php

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<?php
declare(strict_types=1);

namespace Magento\BundleGraphQl\Model\Resolver\Options;

use Magento\Framework\GraphQl\Exception\GraphQlInputException;
use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
use Magento\CatalogGraphQl\Model\Resolver\Products\DataProvider\Deferred\Product as ProductDataProvider;
use Magento\Framework\GraphQl\Config\Element\Field;
use Magento\Framework\GraphQl\Query\Resolver\ValueFactory;
use Magento\Framework\GraphQl\Query\ResolverInterface;

class Label implements ResolverInterface
{
    private $valueFactory;

    private $product;

    public function __construct(ValueFactory $valueFactory, ProductDataProvider $product)
    {
        $this->valueFactory = $valueFactory;
        $this->product = $product;
    }

    public function resolve(
        Field $field,
        $context,
        ResolveInfo $info,
        array $value = null,
        array $args = null
    ) {
        if (!isset($value['sku'])) {
            throw new GraphQlInputException(__('"sku" value should be specified'));
        }

        $this->product->addProductSku($value['sku']);
        $this->product->addEavAttributes(['name']);

        $result = function () use ($value) {
            $productData = $this->product->getProductBySku($value['sku']);
            $productModel = isset($productData['model']) ? $productData['model'] : null;
            return $productModel ? $productModel->getName() : null;
        };

        return $this->valueFactory->create($result);
    }
}