Twig integration in extbase
Usage: Added TwigView to controller
class MyController extends \TYPO3\CMS\Extbase\Mvc\Controller\ActionController
{
protected $defaultViewObjectName = \T3TWIG\View\TwigView::class;
}Add Twig Template in Template Folder
typo3conf/ext/MyExt/Resources/Private/Templates/MyController/Index.html.twig