A list of all currently available themes. Type:

The app root. Type: string File core/lib/Drupal/Cor

public ThemeHandler::rebuildThemeData() Scans

public ThemeHandler::addTheme(Extension $theme)

The route builder to rebuild the routes if a theme is installed. Type:

public ThemeHandler::getDefault() Returns

public ThemeHandler::setDefault($name) Sets

The CSS asset collection optimizer service. Type:

protected ThemeHandler::systemThemeList() Wraps

protected ThemeHandler::doGetBaseThemes(array $themes, $theme, $used_themes