code: def test_exts() -> None:
      assert buc.exts == (".ts", ".js", ".css", ".less")
  
file_path: bokeh/tests/unit/bokeh/util/test_compiler.py
imports: from __future__ import annotations
  import pytest
  import json
  import os
  from unittest.mock import MagicMock, patch
  import bokeh.util.compiler
label_desc: Use image node_id 9 for calling a global function with example usage: test_exts() without return types