Is it possible to type-hint a decorated task for use as a templated operator parameter?

[MatrixManAtYrService]

This appears to work just fine, but my type checker doesn't like it.

from airflow.decorators import dag, task
from airflow.providers.slack.operators.slack import SlackAPIPostOperator

@task
def foo():
    return "foo"

@dag() 
def say_foo():
    # Type checker dislikes the below call to foo()
    #
    # > Argument of type "XComArg" cannot be assigned to parameter "text" of type "str" in function "__init__"
    # > "XComArg" is not assignable to "str"
    SlackAPIPostOperator(task_id="send_message", channel="#my-channel", text=foo())

dag = say_foo()

I can # type: ignore my way out of the problem, but I'm wondering if I can solve it by applying a type hint instead?

[potiuk]

There is an issue for it waiting for somoene to implement it #19884

[MatrixManAtYrService]

oh how funny, that's me from 3yr ago. I forgot that I filed that. Thanks for the pointer.

[potiuk]

Indeed. 🤣