code: def username(self) -> Optional[str]:
      ...
  
imports: import json
  import os
  import queue
  import sys
  from dataclasses import dataclass
  from typing import Any, Dict, Iterable, List, Optional, Tuple
  from unittest.mock import patch
  from google.protobuf.json_format import ParseDict
  from tqdm import tqdm
  import wandb
  from wandb.proto import wandb_internal_pb2
  from wandb.proto import wandb_settings_pb2
  from wandb.proto import wandb_telemetry_pb2
  from wandb.sdk.interface.interface import file_policy_to_enum
  from wandb.sdk.interface.interface_queue import InterfaceQueue
  from wandb.sdk.internal import context
  from wandb.sdk.internal.sender import SendManager
  from wandb.sdk.internal.settings_static import SettingsStatic
  from wandb.util import cast_dictlike_to_dict, coalesce
label_desc: Use image node_id 19 for calling the ImporterRun obj's underlying member method code with example usage: obj.username() without return types