ext_localconf.php

<?php
/***************************************************************
 *  Copyright notice
 *
 *  (c) sgalinski Internet Services (https://www.sgalinski.de)
 *
 *  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 3 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!
 ***************************************************************/

call_user_func(
	function ($extKey) {

		// register command controllers
		$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['extbase']['commandControllers'][] =
			\SGalinski\SgMail\Command\SendMailCommandController::class;

		// add upgrade wizard for moving all db entries to their respected siteroot
		$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/install']['update']['tx_sgmail_update_pid_to_site_root'] = \SGalinski\SgMail\Updates\UpdatePidToSiteRoot::class;
		$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/install']['update']['tx_sgmail_update_sending_times'] = \SGalinski\SgMail\Updates\UpdateSendingTimes::class;
		$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/install']['update']['tx_sgmail_update_languages'] = \SGalinski\SgMail\Updates\UpdateLanguages::class;
		$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/install']['update']['tx_sgmail_update_german_as_default'] = \SGalinski\SgMail\Updates\UpdateGermanAsDefault::class;

		if (TYPO3_MODE === 'BE') {
			\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTypoScriptSetup(
				'<INCLUDE_TYPOSCRIPT: source="FILE:EXT:' . $extKey . '/Configuration/TypoScript/setup.typoscript">'
			);
		}

		// register xclasses
		$GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects'][\TYPO3\CMS\Form\Controller\FormEditorController::class] = [
			'className' => \SGalinski\SgMail\XClass\Form\FormEditorController::class,
		];

		$GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects'][\TYPO3\CMS\Form\Controller\FormManagerController::class] = [
			'className' => \SGalinski\SgMail\XClass\Form\FormManagerController::class,
		];

		// Register FormEngine node type resolvers
		$GLOBALS['TYPO3_CONF_VARS']['SYS']['formEngine']['nodeRegistry']['sgMailFieldInformation'] = [
			'nodeName' => 'sgMailFieldInformation',
			'priority' => 10,
			'class' => \SGalinski\SgMail\Form\NodeExpansion\FieldInformation::class,
		];

		// Datamap process hook
		$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['processDatamapClass'][] = \SGalinski\SgMail\Hooks\ProcessDatamap::class;

		// Cache registration
		$registerService = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(
			\SGalinski\SgMail\Service\RegisterService::class
		);
		$registerService->registerCache();
	}, 'sg_mail'
);