The theme handler service. Type:

public SystemController::systemAdminMenuBlockPage()

Returns responses for System routes. Hierarchy class \Drupal\Core\Controller\

public SystemController::themesPage()

public SystemController::compactPage($mode)

public SystemController::overview($link_id)

System Manager Service. Type:

The form builder service. Type:

public static SystemController::create(ContainerInterface

The theme access checker service. Type: