Fields.php

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<?php
declare(strict_types=1);

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

use Magento\Framework\GraphQl\Config\Data\WrappedTypeProcessor;
use Magento\Framework\GraphQl\Config\Element\Field;
use Magento\Framework\GraphQl\Config\Element\TypeInterface;
use Magento\Framework\GraphQl\Query\ResolverInterface;
use Magento\Framework\GraphQl\Schema\Type\Input\InputMapper;
use Magento\Framework\GraphQl\Schema\Type\Output\ElementMapper\FormatterInterface;
use Magento\Framework\GraphQl\Schema\Type\Output\OutputMapper;
use Magento\Framework\GraphQl\Schema\Type\OutputTypeInterface;
use Magento\Framework\GraphQl\Schema\Type\ScalarTypes;
use Magento\Framework\GraphQl\Schema\TypeFactory;
use Magento\Framework\ObjectManagerInterface;
use Magento\Framework\GraphQl\Schema\Type\ResolveInfoFactory;

class Fields implements FormatterInterface
{
    private $objectManager;

    private $outputMapper;

    private $inputMapper;

    private $typeFactory;

    private $scalarTypes;

    private $wrappedTypeProcessor;

    private $resolveInfoFactory;

    public function __construct(
        ObjectManagerInterface $objectManager,
        OutputMapper $outputMapper,
        InputMapper $inputMapper,
        TypeFactory $typeFactory,
        ScalarTypes $scalarTypes,
        WrappedTypeProcessor $wrappedTypeProcessor,
        ResolveInfoFactory $resolveInfoFactory
    ) {
        $this->objectManager = $objectManager;
        $this->outputMapper = $outputMapper;
        $this->inputMapper = $inputMapper;
        $this->typeFactory = $typeFactory;
        $this->scalarTypes = $scalarTypes;
        $this->wrappedTypeProcessor = $wrappedTypeProcessor;
        $this->resolveInfoFactory = $resolveInfoFactory;
    }

    public function format(TypeInterface $configElement, OutputTypeInterface $outputType): array
    {
        $typeConfig = [
            'fields' => function () use ($configElement, $outputType) {
                $fieldsConfig = [];
                foreach ($configElement->getFields() as $field) {
                    $fieldsConfig[$field->getName()] = $this->getFieldConfig($configElement, $outputType, $field);
                }
                return $fieldsConfig;
            }
        ];
        return $typeConfig;
    }

    private function getFieldType(TypeInterface $typeConfigElement, OutputTypeInterface $outputType, Field $field)
    {
        if ($this->scalarTypes->isScalarType($field->getTypeName())) {
            $type = $this->wrappedTypeProcessor->processScalarWrappedType($field);
        } else {
            if ($typeConfigElement->getName() == $field->getTypeName()) {
                $type = $outputType;
            } else {
                $type = $this->outputMapper->getOutputType($field->getTypeName());
            }

            $type = $this->wrappedTypeProcessor->processWrappedType($field, $type);
        }
        return $type;
    }

    private function getFieldConfig(
        TypeInterface $typeConfigElement,
        OutputTypeInterface $outputType,
        Field $field
    ): array {
        $type = $this->getFieldType($typeConfigElement, $outputType, $field);
        $fieldConfig = [
            'name' => $field->getName(),
            'type' => $type,
        ];

        if (!empty($field->getDescription())) {
            $fieldConfig['description'] = $field->getDescription();
        }

        if ($field->getResolver() != null) {
            $resolver = $this->objectManager->get($field->getResolver());

            $fieldConfig['resolve'] =
                function ($value, $args, $context, $info) use ($resolver, $field) {
                    $wrapperInfo = $this->resolveInfoFactory->create($info);
                    return $resolver->resolve($field, $context, $wrapperInfo, $value, $args);
                };
        }
        return $this->formatArguments($field, $fieldConfig);
    }

    private function formatArguments(Field $field, array $config) : array
    {
        foreach ($field->getArguments() as $argument) {
            $inputType = $this->inputMapper->getRepresentation($argument);

            $config['args'][$argument->getName()] = $inputType;
        }

        return $config;
    }
}