dokuwiki/lib/plugins/extension/helper.php

<?php

use dokuwiki\Extension\Plugin;

/**
 * DokuWiki Plugin extension (Helper Component)
 *
 * This component currently does nothing, except giving access to common plugin functionality
 * like getLang() to be used in the plugin classes.
 *
 * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
 */
class helper_plugin_extension extends Plugin
{
}