Just running the main.py locally works.
Referencing a sub folder as a module

tree:

- test
- - __init__.py
- - base.py
- main.py

in main.py:

from test import base
def some_function():
base.testFunc()

if __name__ == "__main__":
some_function()

When deploying the function, or when running emulators locally with firebase emulators:start

ModuleNotFoundError: No module named 'test'

When running python main.py everything works as expected