IntegerList.php

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<?php
declare(strict_types=1);

namespace Magento\TestModuleGraphQlQueryExtension\Model\Resolver;

use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
use Magento\Framework\GraphQl\Config\Element\Field;
use Magento\Framework\GraphQl\Query\ResolverInterface;

class IntegerList implements ResolverInterface
{
    public function resolve(
        Field $field,
        $context,
        ResolveInfo $info,
        array $value = null,
        array $args = null
    ) {
        if (!isset($value['item_id'])) {
            return null;
        }

        $itemId = $value['item_id'];

        $resultData = [$itemId + 1, $itemId + 2, $itemId + 3];
        return $resultData;
    }
}