ext_localconf.php

<?php

declare(strict_types=1);

use Pluswerk\MailLogger\Logging\MailerExtender;
use Pluswerk\MailLogger\FormDataProvider\MailTemplateFormatHtmlWarningProvider;
use Pluswerk\MailLogger\Hook\MailTemplateDataHandlerHook;
use TYPO3\CMS\Backend\Form\FormDataProvider\TcaColumnsProcessFieldLabels;
use TYPO3\CMS\Core\Mail\Mailer;
use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;

defined('TYPO3') || die();

// Add default TypoScript
ExtensionManagementUtility::addTypoScriptConstants(
    "@import 'EXT:mail_logger/Configuration/TypoScript/constants.typoscript'"
);
ExtensionManagementUtility::addTypoScriptSetup(
    "@import 'EXT:mail_logger/Configuration/TypoScript/setup.typoscript'"
);

$GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects'][Mailer::class] = [
    'className' => MailerExtender::class,
];

$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['processDatamapClass'][] = MailTemplateDataHandlerHook::class;

$GLOBALS['TYPO3_CONF_VARS']['SYS']['formEngine']['formDataGroup']['tcaDatabaseRecord']
[MailTemplateFormatHtmlWarningProvider::class] = [
    'depends' => [
        TcaColumnsProcessFieldLabels::class,
    ],
];