code: def save(self, filepath: str) -> None:
      self._save_widget(filepath)
  
imports: import sys, time, threading, queue, functools
  from typing import Any
  from types import MethodType
  from abc import ABCMeta, abstractmethod
  from .lv_types import StreamVisInfo, StreamItem
  from .None import utils
  from .stream import Stream
label_desc: Use image node_id 4 for calling the VisBase obj's underlying member method code with example usage: obj.save(filepath) without return types