docs: def _get_app_module(self):
          # type: () -> Callable
          """Returns a module which binds the current app and configuration.
  
          :return: configuration callback
          :rtype: Callable
          """
  
          def configure(binder):
              # type: (Binder) -> Callable
              binder.bind(ServiceApplication, to=self, scope=singleton)
              binder.bind(Config, to=self.config, scope=singleton)
  
          return configure