FiltersProvider.php

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<?php
declare(strict_types=1);

namespace Magento\CatalogGraphQl\Model\Resolver\Layer;

use Magento\Catalog\Model\Layer\FilterListFactory;
use Magento\Catalog\Model\Layer\Resolver;

class FiltersProvider
{
    private $layerResolver;

    private $filterableAttributesListFactory;

    private $filterListFactory;

    public function __construct(
        Resolver $layerResolver,
        FilterableAttributesListFactory $filterableAttributesListFactory,
        FilterListFactory $filterListFactory
    ) {
        $this->layerResolver = $layerResolver;
        $this->filterableAttributesListFactory = $filterableAttributesListFactory;
        $this->filterListFactory = $filterListFactory;
    }

    public function getFilters(string $layerType) : array
    {
        $filterableAttributesList = $this->filterableAttributesListFactory->create(
            $layerType
        );
        $filterList = $this->filterListFactory->create(
            [
                'filterableAttributes' => $filterableAttributesList
            ]
        );
        return $filterList->getFilters($this->layerResolver->get());
    }
}