code: def extract_cloud_key(m: Dict[str, Any]) -> Optional[str]:
      """Returns the Google service account key filepath specified in the args;
      defaults to the $GOOGLE_APPLICATION_CREDENTIALS variable.
  
      """
      return m.get("cloud_key") or os.environ.get(
          "GOOGLE_APPLICATION_CREDENTIALS"
      )
  
imports: import os
  import sys
  from enum import Enum
  from typing import Any, Dict, List, Optional, Tuple
  import schema
  import caliban.platform.cloud.types
  import caliban.util.schema
label_desc: Use image node_id 7 for calling a global function with example usage: extract_cloud_key(m) and returns: unknown