newsupernova/vendor/magento/module-sales/Controller/Adminhtml/Order/Creditmemo/Index.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Sales\Controller\Adminhtml\Order\Creditmemo;

class Index extends \Magento\Sales\Controller\Adminhtml\Creditmemo\AbstractCreditmemo\Index
{
}