#3682 [BUG] flytekit 1.6.0 task function calls do not type check Issue created by tekumara ### Describe the bug In flyteorg/flytekit#1631 the

task

return type was changed to effectively

Tuple[Promise] | Promise | VoidPromise | Tuple[Unknown, ...] | None

. This breaks usage of tasks in type checkers like pyright / vscode. ### Expected behavior Task function calls still type check correctly, as they did in flytekit 1.5.0 ### Additional context to reproduce This type checks without errors in flytekit 1.5.0: from typing import Dict, List, NamedTuple import pandas as pd from flytekit import task, workflow class OpenFlightsData(NamedTuple): routes: List[Dict[str, str]] airlines: Dict[str, str] airports: Dict[str, Dict[str, str]] @task() def extract_reference_data() -> OpenFlightsData: return OpenFlightsData( routes=[{"MAO": "CIZ"}], airlines={"0B": "Blue Air"}, airports={"AAA": {"lat": "1", "lon": "2"}} ) @task() def extract_live_data() -> pd.DataFrame: return pd.DataFrame() @task() def transform(raw_aircraft_data: pd.DataFrame, airlines: Dict[str, str]) -> pd.DataFrame: # do stuff .. return pd.DataFrame() @workflow def main() -> None: reference_data = extract_reference_data() reveal_type(reference_data) # expecting OpenFlightsData live_data = extract_live_data() reveal_type(live_data) # expecting Dataframe transform(raw_aircraft_data=live_data, airlines=reference_data.airlines) if name == "__main__": main() With flytekit 1.6.0 and pyright / vscode:

❯ pyright test.py
test.py
  test.py:34:17 - information: Type of "reference_data" is "Tuple[Promise] | Promise | VoidPromise | Tuple[Unknown, ...] | None"
  test.py:36:17 - information: Type of "live_data" is "Tuple[Promise] | Promise | VoidPromise | Tuple[Unknown, ...] | None"
  test.py:38:68 - error: Cannot access member "airlines" for type "Tuple[Promise]"
    Member "airlines" is unknown (reportGeneralTypeIssues)
  test.py:38:68 - error: Cannot access member "airlines" for type "Promise"
    Member "airlines" is unknown (reportGeneralTypeIssues)
  test.py:38:68 - error: Cannot access member "airlines" for type "VoidPromise"
    Member "airlines" is unknown (reportGeneralTypeIssues)
  test.py:38:68 - error: Cannot access member "airlines" for type "Tuple[Unknown, ...]"
    Member "airlines" is unknown (reportGeneralTypeIssues)
  test.py:38:68 - error: "airlines" is not a known member of "None" (reportOptionalMemberAccess)
5 errors, 0 warnings, 2 informations

### Screenshots No response ### Are you sure this issue hasn't been raised already? • Yes ### Have you read the Code of Conduct? • Yes flyteorg/flyte