task decorator is wrongly typed

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#946 3 comments 4 reactions 0 assignees View on GitHub

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
python
Domain
cli

Research direction

Start at the task decorator in invoke.tasks and Collection.add_task in invoke.collection, using the example in the issue to reproduce the mypy error. Trace the declared types for the decorated function and add_task; the work is done when mypy accepts ns.add_task(foo) without the reported argument-type error.

Written by the indexing model from the issue text.

Description

from invoke.tasks import task
from invoke.collection import Collection

@task
def foo(ctx):
    pass

ns = Collection()
ns.add_task(foo)

leads to an mypy error:

error: Argument 1 to "add_task" of "Collection" has incompatible type "Callable[..., Any]"; expected "Task[Any]"  [arg-type]
    ns.add_task(foo)
Dominant language
Python
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