No type hints detected by mypy: module is installed, but missing library stubs or py.typed marker

[bew]

Here are the exact steps I did:

# In an empty folder:
$ poetry init
$ poetry add reflex # Installed version 0.7.0
$ poetry add --dev mypy # Installed version 1.15.0
$ reflex init # Using the blank template
$ reflex run # it works fine, I stopped it

$ mypy .
rxconfig.py:1: error: Skipping analyzing "reflex": module is installed, but missing library stubs or py.typed marker  [import-untyped]
try_reflex_app/try_reflex_app.py:3: error: Skipping analyzing "reflex": module is installed, but missing library stubs or py.typed marker  [import-untyped]
try_reflex_app/try_reflex_app.py:3: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
Found 2 errors in 2 files (checked 3 source files)

But issues like #3374 make me think that mypy was working already for them, so maybe I'm just missing something?

What's most surprising is that the installed reflex package does have the .pyi files 🤔

edit: After thinking about it, I definitely should have used the bug issue template, sorry about that.. I can re-create it if you need

[linear]

ENG-4648 No type hints detected by `mypy`: module is installed, but missing library stubs or py.typed marker

[adhami3310]

we haven't tested mypy deeply, but generally speaking, we only support pyright, other type checkers may have incomplete or wrong types, i might investigate this later

[bew]

Hello, adding an empty file py.typed at the root of the package could help a lot already.

This file is a standard:
https://typing.readthedocs.io/en/latest/spec/distributing.html#packaging-type-information

Package maintainers who wish to support type checking of their code MUST add a marker file named py.typed to their package supporting typing. This marker applies recursively: if a top-level package includes it, all its sub-packages MUST support type checking as well.