All classes that implement RouteBuilderInterface in Drupal 9
- class \Drupal\Core\Installer\InstallerRouteBuilder
- class \Drupal\Core\ProxyClass\Routing\RouteBuilder implements DestructableInterface, RouteBuilderInterface uses DependencySerializationTrait
- class \Drupal\Core\Routing\RouteBuilder implements DestructableInterface, RouteBuilderInterface