code: def save_config(config: Config) -> None:
      with open(CONFIG_FILENAME, "wb") as f:
          pickle.dump(config, f)
  
imports: from __future__ import annotations
  import pickle
  from .config import Config
  from .pipeline import StepType
label_desc: Use image node_id 2 for calling a global function with example usage: save_config(config) without return types