Aim seems to have decent type annotations. Unfortunately it is missing a py.typed marker, which would allow users to actually benefit from these typings.

For instance when type checking the following user snippet with mypy:

from aim import Repo, Run

repo = Repo("/tmp/test_repo")
run = Run(repo=repo)

reveal_type(repo)
reveal_type(run)

repo.non_existing_method()
run.non_existing_method()

The output is:

debug_aim_types.py:6: note: Revealed type is "Any"
debug_aim_types.py:7: note: Revealed type is "Any"
Success: no issues found in 1 source file

i.e., mypy just sees untyped Any instances and fails to detect any bug / wrong usage on them, which is a bummer.

By adding this py.typed marker, mypy will reveal the types properly as Repo and Run, and it will be able to detect erroneous usages.