ext_localconf.php
<?php /** @noinspection PhpUndefinedVariableInspection */
defined('TYPO3_MODE') || die('Access denied.');
call_user_func(
function ($extKey) {
$GLOBALS['TYPO3_CONF_VARS']['FE']['eID_include']['jslogger'] =
\ChristianEssl\JsLogger\Log\JsLogger::class . '::log';
},
$_EXTKEY
);