The menu description. Type: string File core/module

protected ThemeSettingsForm::validatePath($path)

template_preprocess_system_themes_page(&$variables) Prepares variables for appearance page templates.

The MIME type guesser. Type: \Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesserInterface

protected FileSystemForm::getEditableConfigNames()

The app root. Type: string File core/modules/system

Defines the access control handler for the date format entity type. Hierarchy class

public ThemeSettingsForm::getFormId()

Admin page callbacks for the system module. File core/modules/system/system.admin.inc

public ModulesListForm::__construct(ModuleHandlerInterface