ResolveType.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\GraphQl\Schema\Type\Output\ElementMapper\Formatter;

use Magento\Framework\GraphQl\Config\Element\InterfaceType;
use Magento\Framework\GraphQl\Config\Element\TypeInterface;
use Magento\Framework\GraphQl\Schema\Type\OutputTypeInterface;
use Magento\Framework\GraphQl\Schema\Type\Output\ElementMapper\FormatterInterface;
use Magento\Framework\ObjectManagerInterface;

class ResolveType implements FormatterInterface
{
    private $objectManager;

    public function __construct(ObjectManagerInterface $objectManager)
    {
        $this->objectManager = $objectManager;
    }

    public function format(TypeInterface $configElement, OutputTypeInterface $outputType) : array
    {
        $config = [];
        if ($configElement instanceof InterfaceType) {
            $typeResolver = $this->objectManager->create($configElement->getTypeResolver());
            $config['resolveType'] = function ($value) use ($typeResolver) {
                return $typeResolver->resolveType($value);
            };
        }

        return $config;
    }
}