TierPrices.php

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<?php
declare(strict_types=1);

namespace Magento\CatalogGraphQl\Model\Resolver\Product;

use Magento\Framework\GraphQl\Exception\GraphQlInputException;
use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
use Magento\Catalog\Model\Product;
use Magento\Catalog\Model\Product\TierPrice;
use Magento\Framework\GraphQl\Config\Element\Field;
use Magento\Framework\GraphQl\Query\ResolverInterface;

class TierPrices implements ResolverInterface
{
    public function resolve(
        Field $field,
        $context,
        ResolveInfo $info,
        array $value = null,
        array $args = null
    ) {
        if (!isset($value['model'])) {
            throw new GraphQlInputException(__('"model" value should be specified'));
        }

        $product = $value['model'];

        $tierPrices = null;
        if ($product->getTierPrices()) {
            $tierPrices = [];
            foreach ($product->getTierPrices() as $tierPrice) {
                $tierPrices[] = $tierPrice->getData();
            }
        }

        return $tierPrices;
    }
}