RecentlyViewed.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Catalog\Block\Widget;

use Magento\Ui\Block\Wrapper;

/**
 * Dynamically creates recently viewed widget ui component, using information
 * from widget instance and Catalog/widget.xml
 */
class RecentlyViewed extends Wrapper implements \Magento\Widget\Block\BlockInterface
{
}