Config.php

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<?php
namespace Magento\Catalog\Model\Attribute;

class Config
{
    protected $_dataStorage;

    public function __construct(\Magento\Catalog\Model\Attribute\Config\Data $dataStorage)
    {
        $this->_dataStorage = $dataStorage;
    }

    public function getAttributeNames($groupName)
    {
        return $this->_dataStorage->get($groupName, []);
    }
}