code: def _merge_item(d, key, value):
      if key in d:
          item = d.get(key, None)
          if isinstance(item, dict) and isinstance(value, dict):
              merge_dicts(item, value)
          else:
              d[key] = value
      else:
          d[key] = value
  
file_path: dvc/dvc/utils/collections.py
imports: from collections.abc import Mapping
  from typing import Dict, Iterable, List, Union, no_type_check
label_desc: Use image node_id 4 for calling a global function with example usage: _merge_item(d, key, value) without return types