code: def has_fs(scheme: str) -> bool:
      """
      Check if a filesystem is available for a scheme.
  
      :param scheme: the scheme to check
      :return: True if a filesystem is available for the scheme
      """
      return scheme in _register_filesystems()
  
file_path: airflow/airflow/io/__init__.py
imports: from __future__ import annotations
  import inspect
  import logging
  from typing import TYPE_CHECKING, Callable, Mapping
  from fsspec.implementations.local import LocalFileSystem
  from airflow.compat.functools import cache
  from airflow.providers_manager import ProvidersManager
  from airflow.stats import Stats
  from airflow.utils.module_loading import import_string
label_desc: Use image node_id 4 for calling a global function with example usage: has_fs(scheme) and returns: unknown