I need some help getting my first-party type checks working. I have a directory structured like this:

src
├── common
│   ├── auth
|       ├── BUILD
|       ├── auth1.py
|       ├── auth2.py
│       └── mypy-stubs
|           ├── BUILD
|           ├── auth1.pyi
│           └── auth2.pyi
├── services
│   ├── app
|       ├── BUILD
│       └── app.py

I want to run type-checking on

app

, which imports `auth1`/`auth2`. When I list dependencies for

auth

, I see the `pyi`s, but I don't see them in dependencies for

app

. I have tried explicitly listing them app's

BUILD

, and they will be listed as dependencies when I do, but the type check still fails with

error: Cannot find implementation or library stub for module named "common.auth.auth1"

(same error for

auth2

). I feel like I've gotten this to work in the past - what am I missing here?

Do you have all your initpys in the right place?

1. Which initpys? I have an init in the

auth

and

app

directories, and an

__init__.pyi

in the

mypy-stubs

directory. 2. I'm using mypy through the

./pants check

goal. My understanding is that it will use standard dependency inference to find the stubs, but clearly that is not the case. How else can I get it to find them?

What are your source roots here?

Nothing in these directories. I just tried adding

src/common/auth/mypy-stubs/

as a root, but still got the error.

Dep inference does rely on source roots being set up correctly. Are

auth

and

services

the top-level packages? If so then

src/

should be a source root (and it may already be one, I just want to verify). You can see your source roots with

./pants roots

Yes,

src/

is a source root