code: def warn(msg: str | None = None, label: str = "WARN") -> None:
      text = " " + msg if msg is not None else ""
      write(yellow(f"[{label}]") + text)
  
file_path: bokeh/src/bokeh/util/terminal.py
imports: from __future__ import annotations
  import logging
  import sys
label_desc: Use image node_id 6 for calling a global function with example usage: warn(msg, label) without return types