Inject custom typing information into module

[ingomueller-net]

I am running into a case where I am adding a class to a module manually (via mlir_type_subclass in llvm/llvm-project#127518). stubgen does not generate anything for that class in the *.pyi file generated by the recommended CMake rule, so pyright complains about a non-existent class. What's the recommended way to deal with this?

One solution I imagine is the possibility to inject hand-written code into a module exposed by nanobind. This seems similar to nb::sig, which allows to override something that stubgen doesn't handle out of the box.

[ingomueller-net]

I guess one work-around is, instead of using the CMake rule, to generate the stub by hand and then modify it. But manually modifying generated code isn't a great process...

[wjakob]

You can also use a pattern file to inject extra content. Please review the associated part of the documentation.