code: def using_vegafusion() -> bool:
      """Check whether the vegafusion data transformer is enabled"""
      # Local import to avoid circular ImportError
      from altair import data_transformers
  
      return data_transformers.active == "vegafusion"
  
file_path: altair/altair/utils/_vegafusion_data.py
imports: from toolz import curried
  import uuid
  from weakref import WeakValueDictionary
  from typing import Union, Dict, Set, MutableMapping, TypedDict, Final, TYPE_CHECKING
  from altair.utils._importers import import_vegafusion
  from altair.utils.core import DataFrameLike
  from altair.utils.data import DataType, ToValuesReturnType, MaxRowsError
  from altair.vegalite.data import default_data_transformer
label_desc: Use image node_id 7 for calling a global function with example usage: using_vegafusion() and returns: unknown