Support for type checking with Pyright

[disrupted]

Pyright currently complains when using dtyper as a drop-in replacement that @app.command decorators are missing self as parameter.

error: Type of "command" is partially unknown
    Type of "command" is "_Wrapped[(self: typer.main.Typer, name: str | None = None, *, cls: type[TyperCommand] | None = None, context_settings: Dict[Any, Any] | None = None, help: str | None = None, epilog: str | None = None, short_help: str | None = None, options_metavar: str = "[OPTIONS]", add_help_option: bool = True, no_args_is_help: bool = False, hidden: bool = False, deprecated: bool = False, rich_help_panel: str | None = Default(None)), (CommandFunctionType@command) -> CommandFunctionType@command, (self: dtyper.Typer, *a: Unknown, **ka: Unknown), _Wrapped[(CommandFunctionType@command), CommandFunctionType@command, (f: Unknown), (...) -> Unknown]]" (reportUnknownMemberType)
error: Argument missing for parameter "self" (reportGeneralTypeIssues)
error: Untyped function decorator obscures type of function; ignoring decorator (reportUntypedFunctionDecorator)

probably it could be solved by adding more complete type annotations to dtyper.

[rec]

Hello, and sorry for the delay! I'm doing a release of some other unrelated project as I write; but the good news is that I know a lot more about typing than I did when I wrote dtyper so adding it should be, well, easier anyway.

Make a comment, it will sit in my inbox, I'll get to it tomorrow.

Thanks for using my work!!

[disrupted]

thanks for the swift reply, that's great to hear!

[rec]

Very, very sorry about the delay!

Two things happened. First, I wasn't able to solve the problem in several hours of work, and I intended to go back to it, but then the job became horrible, and my time vanished.

I'm still TBH not sure how to solve this issue, nor am I able to make dtyper.dataclass typesafe, which now bothers me all the time.

Got any ideas?

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I'll have a look, thanks for the feedback

[rec]

I've got plenty of time right now, that last job collapsed, so I can be super responsive, and now it's personal :-D since it's getting in my way.

[disrupted]

I found this issue which sounds like what we want, but wasn't able to solve it. python/mypy#7778

As a current workaround, it's possible to repeat app as the self-Parameter in the decorator

edit: nevermind, this errors at runtime

app = dtyper.Typer()

@app.command(app, help="test")
def test(
    ...
) -> None:
    ...

[disrupted]

I believe @wraps is used correctly, but likely the typing stubs from typeshed aren't suitable to detect that self is already present since the decorator is defined as a method of Typer (we're already inside an instance of the class).

https://github.com/python/typeshed/blob/95cee3100aeae722005fa9cd26f36907e25fccb6/stdlib/functools.pyi#L121

perhaps we could open an issue there to ask for advice.