Defines the theme registry service. @internal Theme registry is expected to be used only internally since every

public ThemeManager::setThemeRegistry(Registry $theme_registry)

public ThemeManager::getActiveTheme(RouteMatchInterface $route_match = NULL)

public ActiveTheme::getStyleSheetsRemove() Returns

public ActiveTheme::getLibrariesOverride() Returns

The path to the theme engine for root themes. Type: string File

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

Stores whether the registry was already initialized. Type: bool File

public ThemeManagerInterface::hasActiveTheme()

public ThemeInitialization::initTheme($theme_name)