ext_localconf.php

<?php
if (!defined('TYPO3_MODE')) {
	die('Access denied.');
}

$GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['vhs']['setup'] = unserialize($_EXTCONF);
if (!isset($GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['vhs']['setup']['disableAssetHandling']) || !$GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['vhs']['setup']['disableAssetHandling']) {
    $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['usePageCache'][] = 'FluidTYPO3\\Vhs\\Service\\AssetService';
    $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['contentPostProc-output'][] = 'FluidTYPO3\\Vhs\\Service\\AssetService->buildAllUncached';
    $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['clearCachePostProc'][] = 'FluidTYPO3\\Vhs\\Service\\AssetService->clearCacheCommand';
}

if (FALSE === is_array($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['vhs_main'])) {
	$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['vhs_main'] = [
		'frontend' => 'TYPO3\\CMS\\Core\\Cache\\Frontend\\StringFrontend',
		'options' => [
			'defaultLifetime' => 804600
		],
		'groups' => ['pages', 'all']
	];
}

if (FALSE === is_array($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['vhs_markdown'])) {
	$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['vhs_markdown'] = [
		'frontend' => 'TYPO3\\CMS\\Core\\Cache\\Frontend\\StringFrontend',
		'options' => [
			'defaultLifetime' => 804600
		],
		'groups' => ['pages', 'all']
	];
}

$GLOBALS['TYPO3_CONF_VARS']['SYS']['fluid']['namespaces']['v'] = ['FluidTYPO3\\Vhs\\ViewHelpers'];

// add navigtion hide, url and urltype to fix the rendering of external url doktypes
$GLOBALS['TYPO3_CONF_VARS']['FE']['addRootLineFields'] .= (TRUE === empty($GLOBALS['TYPO3_CONF_VARS']['FE']['addRootLineFields']) ? '' : ',') . 'nav_hide,url,urltype';