code: def _default_function(first: int, second: int) -> int:
      return first + second
  
file_path: haystack/haystack/testing/sample_components/accumulate.py
imports: from typing import Callable, Optional, Dict, Any
  import sys
  import builtins
  from importlib import import_module
  from haystack.core.serialization import default_to_dict
  from haystack.core.component import component
  from haystack.core.errors import ComponentDeserializationError
label_desc: Use image node_id 1 for calling a global function with example usage: _default_function(first, second) and returns: unknown