py.typed missing while code does have type hints

[akaihola]

The pyupgrade code base is thoroughly type hinted, but type checkers like Mypy disregard the hints since the py.typed marker file is missing (see Packaging Type Information in the Static Typing with Python guide).

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Note:
I am aware that pyupgrade doesn't provide a public Python API and thus this really doesn't matter. Nevertheless, I'm experimenting with supporting pyupgrade as a code formatting backend for Darker, and calling it directly in Python instead of as a subprocess gives a nice speed-up (see akaihola/darker#755). I will of course consider the options (subprocess vs. private Python API with extra checks and guardrails like I've done with Black) before releasing this feature.

[asottile]

there is no public API