code: def is_dev() -> bool:
      return convert_bool(os.environ.get("BOKEH_DEV", False))
  
imports: from __future__ import annotations
  import logging
  import os
  from os.path import join
  from pathlib import Path
  from typing import TYPE_CHECKING, Any, Callable, Generic, Literal, Sequence, TypeVar, Union, cast
  import yaml
  from .util.deprecation import deprecated
  from .util.paths import bokehjs_path, server_path
label_desc: Use image node_id 8 for calling a global function with example usage: is_dev() and returns: convert_bool