Static typing: Untyped event_source decorator with mypy --strict about powertools-lambda-python HOT 2 OPEN

Thanks for opening your first issue here! We'll come back to you as soon as we can.
In the meantime, check out the #python channel on our Powertools for AWS Lambda Discord: Invite link

from powertools-lambda-python.

Hi @JakubSosnovec! Thanks for bringing this question! Strict typing has been on our radar for a long time and we are correcting what is possible every time we release a new version, but this project is not 100% compatible with strict typing and we are investigating how to include it in our roadmap, but we do not have an ETA for that. I'll add this issue to our backlog and see if we can do something specifically for this case.

@heitorlessa would love to hear your thoughts here.

BTW, I'm trying here with mypy 1.4+ and Powertoos 1.25.7 and I get the same error. It seems like something is still unresolved.

❯ pip freeze
aws-lambda-powertools==1.25.7
aws-xray-sdk==2.12.1
boto3==1.34.10
botocore==1.34.10
fastjsonschema==2.19.1
jmespath==0.10.0
mypy==1.4.1
mypy-extensions==1.0.0
python-dateutil==2.8.2
s3transfer==0.10.0
six==1.16.0
tomli==2.0.1
typing-extensions==4.9.0
urllib3==1.26.18
wrapt==1.16.0

from typing import Any
from aws_lambda_powertools.utilities.data_classes import SQSEvent, event_source
from aws_lambda_powertools.utilities.typing import LambdaContext
@event_source(data_class=SQSEvent)
def handler(event: SQSEvent, _context: LambdaContext) -> dict[str, Any]:
    return {}

❯ mypy --strict main.py       
main.py:4: error: Untyped decorator makes function "handler" untyped  [misc]
Found 1 error in 1 file (checked 1 source file)

from powertools-lambda-python.