feat: Only install typing-extensions dependency when necessary missing in some files

[HarbingersRequiem]

Use case

This is the same issue as noted in #280. Looks like the following files are missing the conditionals put in which is causing issues, for me at least, with some Lambda scripts:

• aws_lambda_powertools/event_handler/middlewares/base.py
• aws_lambda_powertools/metrics/provider/cloudwatch_emf/types.py
• aws_lambda_powertools/metrics/types.py
• aws_lambda_powertools/utilities/batch/types.py
• aws_lambda_powertools/utilities/parameters/ssm.py
• aws_lambda_powertools/utilities/parameters/types.py
• aws_lambda_powertools/utilities/streaming/s3_object.py

Solution/User Experience

Same as previous feat. Add the conditionals around the import for typing_extensions

Alternative solutions

No response

Acknowledgment

• This feature request meets Powertools for AWS Lambda (Python) Tenets
• Should this be considered in other Powertools for AWS Lambda languages? i.e. Java, TypeScript, and .NET

[boring-cyborg]

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

[heitorlessa]

hey @HarbingersRequiem, thank you for reporting it -- did it cause you a runtime error in Lambda? if so, we'll switch it to bug and get on it now.

Apologies for letting this slip during PRs, we'll think of a linter or a shared types to make this sustainable.

[HarbingersRequiem]

Hey @heitorlessa, it did, yeah. Got this out of it "[ERROR] Runtime.ImportModuleError: Unable to import module 'lambda_function': No module named 'typing_extensions' Traceback (most recent call last):"

Thanks for the quick response on it!

[heitorlessa]

okay, working on that now. Switching to bug.

[heitorlessa]

One quick note only... typing_extensions is a required dependency in Powertools. Back then we made it optional for 3.7 only.

powertools-lambda-python/pyproject.toml

Line 36 in 86619e5

typing-extensions = "^4.6.2"

That shouldn't cause the No module named 'typing_extensions'.

[heitorlessa]

PR in, classified as typing instead of bug as couldn't reproduce at runtime using the latest version given it's a runtime dependency.

[heitorlessa]

All good and tested. Because we can't reproduce at runtime when installing the latest powertools for AWS version, we'll make a release tomorrow instead of now.

Still, we care about it :)

[github-actions]

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[github-actions]

This is now released under 2.25.0 version!