OutputMapper.php

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<?php
declare(strict_types=1);

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

use Magento\Framework\GraphQl\ConfigInterface;
use Magento\Framework\GraphQl\Schema\Type\OutputTypeInterface;
use Magento\Framework\GraphQl\Schema\TypeFactory;
use Magento\Framework\GraphQl\Exception\GraphQlInputException;
use Magento\Framework\Phrase;

class OutputMapper
{
    private $outputFactory;

    private $outputTypes;

    private $typeFactory;

    private $config;

    public function __construct(
        OutputFactory $outputFactory,
        TypeFactory $typeFactory,
        ConfigInterface $config
    ) {
        $this->outputFactory = $outputFactory;
        $this->config = $config;
        $this->typeFactory = $typeFactory;
    }

    public function getOutputType($typeName)
    {
        if (!isset($this->outputTypes[$typeName])) {
            $configElement = $this->config->getConfigElement($typeName);
            $this->outputTypes[$typeName] = $this->outputFactory->create($configElement);
            if (!($this->outputTypes[$typeName] instanceof OutputTypeInterface)) {
                throw new GraphQlInputException(
                    new Phrase("Type '{$typeName}' was requested but is not declared in the GraphQL schema.")
                );
            }
        }

        return $this->outputTypes[$typeName];
    }
}