code: def update(ref):
      comp = ref()
      if comp is not None:
          comp.update()
  
file_path: distributed/distributed/dashboard/components/__init__.py
imports: from __future__ import annotations
  import weakref
  from bokeh.core.properties import without_property_validation
label_desc: Use image node_id 2 for calling a global function with example usage: update(ref) without return types