Filter.php

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<?php
declare(strict_types=1);

namespace Magento\CatalogGraphQl\Model\Resolver\Products\Query;

use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
use Magento\Framework\Api\SearchCriteriaInterface;
use Magento\CatalogGraphQl\Model\Resolver\Products\DataProvider\Product;
use Magento\CatalogGraphQl\Model\Resolver\Products\SearchResult;
use Magento\CatalogGraphQl\Model\Resolver\Products\SearchResultFactory;
use Magento\Framework\GraphQl\Query\FieldTranslator;

class Filter
{
    private $searchResultFactory;

    private $productDataProvider;

    private $fieldTranslator;

    private $layerResolver;

    public function __construct(
        SearchResultFactory $searchResultFactory,
        Product $productDataProvider,
        \Magento\Catalog\Model\Layer\Resolver $layerResolver,
        FieldTranslator $fieldTranslator
    ) {
        $this->searchResultFactory = $searchResultFactory;
        $this->productDataProvider = $productDataProvider;
        $this->fieldTranslator = $fieldTranslator;
        $this->layerResolver = $layerResolver;
    }

    public function getResult(
        SearchCriteriaInterface $searchCriteria,
        ResolveInfo $info,
        bool $isSearch = false
    ): SearchResult {
        $fields = $this->getProductFields($info);
        $products = $this->productDataProvider->getList($searchCriteria, $fields, $isSearch);
        $productArray = [];
        foreach ($products->getItems() as $product) {
            $productArray[$product->getId()] = $product->getData();
            $productArray[$product->getId()]['model'] = $product;
        }

        return $this->searchResultFactory->create($products->getTotalCount(), $productArray);
    }

    private function getProductFields(ResolveInfo $info) : array
    {
        $fieldNames = [];
        foreach ($info->fieldNodes as $node) {
            if ($node->name->value !== 'products') {
                continue;
            }
            foreach ($node->selectionSet->selections as $selection) {
                if ($selection->name->value !== 'items') {
                    continue;
                }

                foreach ($selection->selectionSet->selections as $itemSelection) {
                    if ($itemSelection->kind === 'InlineFragment') {
                        foreach ($itemSelection->selectionSet->selections as $inlineSelection) {
                            if ($inlineSelection->kind === 'InlineFragment') {
                                continue;
                            }
                            $fieldNames[] = $this->fieldTranslator->translate($inlineSelection->name->value);
                        }
                        continue;
                    }
                    $fieldNames[] = $this->fieldTranslator->translate($itemSelection->name->value);
                }
            }
        }

        return $fieldNames;
    }
}