#5737 [Core feature] Generic alias support Issue created by wild-endeavor Motivation: Why do you think this is important? flytekit currently does not have generic alias support. That is, while this works @task def t1(nodelist: List[int] | None = None): print(nodelist) this does not @task def t2(nodelist: list[int] | None = None): print(nodelist) If you try to run this, you get the error

isinstance() argument 2 cannot be a parameterized generic

that's mentioned in docs for standard types. Propose: Link/Inline OR Additional context The usage of isinstance is currently coming from the

assert_type

call in the type engine. Kinda worked around that in here https://github.com/flyteorg/flytekit/pull/2743/files and got the trivial case above working but additional tests and more complex cases need to be considered. Are you sure this issue hasn't been raised already? • Yes Have you read the Code of Conduct? • Yes flyteorg/flyte

will this work with

Optional[list[int]]

also?

This does work

I think the ListTransformer may need these changes also? WDYT?https://github.com/flyteorg/flytekit/blob/effa4431a3de7b7c03b62b0bab7eb949311e00ad/flytekit/core/type_engine.py#L1331-L1370

cc @thankful-minister-83577

The reason I say this is because when we try to return a

list[str]

from an agent, we get

Type of Generic List type is not supported, Only generic univariate typing.List[T] type is supported.

let me re-open the ticket

#5737 [Core feature] Generic alias support Issue reopened by wild-endeavor flyteorg/flyte