Reimplement popular Mypy plugins

[johnthagen]

Description

In order to migrate from Mypy to Ruff for static type checking, one thing users may need are reimplementations of the most popular Mypy plugins.

• https://mypy.readthedocs.io/en/stable/extending_mypy.html#extending-mypy-using-plugins

Assuming for a moment that exposing a Mypy-compatible plugin interface is out of scope, the following Mypy plugins are ones I've seen in wide use within the community and could be considered:

• Some appear built into Mypy already: https://github.com/python/mypy/tree/master/mypy/plugins
• (Deprecated) Numpy: https://numpy.org/devdocs/reference/typing.html#mypy-plugin
• Pydantic: https://docs.pydantic.dev/latest/integrations/mypy/#enabling-the-plugin
• django-stubs: https://github.com/typeddjango/django-stubs?tab=readme-ov-file#installation
• djangorestframework-stubs: https://github.com/typeddjango/djangorestframework-stubs?tab=readme-ov-file#installation

Another list of Mypy plugins I found:

• https://github.com/typeddjango/awesome-python-typing?tab=readme-ov-file#mypy-plugins

Related to

• Static type checking à la mypy #3893

[NeilGirdhar]

The numpy plugin is deprecated and the stubs are not plugins, right? Might want to remove those from your list.

[UnknownPlatypus]

django-stubs and djangorestframework-stubs both expose mypy plugin on top of the stubs

[MichaReiser]

We don't plan to support Mypy plugins for our initial static type checker release, but it's something that's on our mind. I'll close this as it's not planned until after the initial type checker release.