ext_localconf.php

<?php
defined('TYPO3_MODE') or die();
/**
 *  Copyright notice
 *
 *  ⓒ 2016 Michiel Roos <michiel@maxserv.com>
 *  All rights reserved
 *
 *  This script is part of the TYPO3 project. The TYPO3 project is free
 *  software; you can redistribute it and/or modify it under the terms of the
 *  GNU General Public License as published by the Free Software Foundation;
 *  either version 2 of the License, or (at your option) any later version.
 *
 *  The GNU General Public License can be found at
 *  http://www.gnu.org/copyleft/gpl.html.
 *
 *  This script is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 *  or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 *  more details.
 *
 *  This copyright notice MUST APPEAR in all copies of the script!
 */

// Register command controllers
$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['extbase']['commandControllers'][] =
    \MaxServ\YamlConfiguration\Command\TsConfigCommandController::class;
$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['extbase']['commandControllers'][] =
    \MaxServ\YamlConfiguration\Command\ExportCommandController::class;
$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['extbase']['commandControllers'][] =
    \MaxServ\YamlConfiguration\Command\ImportCommandController::class;