code: def teardown_websocket(self, func: Callable) -> Callable:
          
          self.record_once(lambda state: state.app.teardown_websocket(func, self.name))
          return func
docs: Add a teardown websocket function to the Blueprint.
  
          This is designed to be used as a decorator, and has the same
          arguments as :meth:`~quart.Quart.teardown_websocket`. It
          applies only to requests that are routed to an endpoint in
          this blueprint. An example usage,
  
          .. code-block:: python
  
              blueprint = Blueprint(__name__)
              @blueprint.teardown_websocket
              def teardown():
                  ...