Resolves #4675, resolves #9981.

Additionally, we always ignore site-packages and node_modules,
and directories starting with a dot. Also note that this doesn't really 
affect import discovery; it only directly affects passing files or 
packages to mypy.

The additional check before suggesting "are you missing an
__init__.py" didn't make any sense to me, so I removed it, appended to
the message and downgraded the severity to note.

Co-authored-by: hauntsaninja <>

This was failing during wheel builds because we run the tests after
installation (under `site-packages`), and this confused the module
search logic. Hard code the paths to make this work in any install
location.

This reverts commit 6c5ed18.

Co-authored-by: hauntsaninja <>

Co-authored-by: hauntsaninja <>

The contents are extracted from the current GitHub action definition:
https://github.com/mypyc/mypy_mypyc-wheels/blob/master/.github/workflows/build.yml

This is a fairly direct translation of the existing behavior. The
behavior should be identical to the current workflow.

The idea is to make this easier to maintain and easier to test
locally.

This should also make it easier to fix #10074.