Error "Could not map installation path to an equivalent wheel directory" with nanobind stubgen

[moi15moi]

I'm trying to use stubgen to generate the stub file and install it in my project like this:

stubgen = nanobind_dep.get_variable('stubgen')
custom_target(
  output: 'abc_video_provider.pyi',
  depends: mod_abc_video_provider,
  command: [py, stubgen, '-m', 'video_timestamps.video_provider.abc_video_provider'],
  build_by_default: true,
  install: true,
  install_dir : 'video_timestamps/video_provider'
)

If I try to create a wheel (ex: python -m build), I get this error:

Module "video_timestamps.video_provider.abc_video_provider" ..
  - importing ..
  - analyzing ..
  - writing stub "/tmp/build-via-sdist-wb_8emjr/videotimestamps-1.0.0rc2/.mesonpy-tu7lnt8a/video_timestamps/video_provider/abc_video_provider.pyi" ..
[30/30] Linking target video_timestamps/video_provider/ffms2_video_provider.cpython-313-x86_64-linux-gnu.so

meson-python: error: Could not map installation path to an equivalent wheel directory: '{prefix}/video_timestamps/video_provider/abc_video_provider.pyi'

I don't understand what the error means.
What I am doing wrong?

[moi15moi]

Oh, I just found out.
I just needed to add py.get_install_dir() to the install_dir

stubgen = nanobind_dep.get_variable('stubgen')
custom_target(
    output: 'abc_video_provider.pyi',
    depends: mod_abc_video_provider,
    command: [py, stubgen, '-m', 'video_timestamps.video_provider.abc_video_provider'],
    install: true,
    install_dir : py.get_install_dir() / 'video_timestamps/video_provider'
)

It does work, but with editable install, mypy doesn't find the .pyi file. I don't know what i could do to fix that.

[rgommers]

Thanks for the update.

It does work, but with editable install, mypy doesn't find the .pyi file. I don't know what i could do to fix that.

Nothing, unfortunately. The designs/PEPs for editable installs (needs an import hook which executes code) and the requirements for static typing tools (tool authors do not want to execute any code) conflict, so there is nothing we can fix here. See gh-555 for a discussion.

You should be able to run Mypy on a regular install though.

[moi15moi]

Thanks. Kinda sucks that there is nothing to do for editable install, but anyways, meson-python isnt the cause of the problem so lets close this.