Hey! I'm following the docs here and using the following command derived from examples in there:

pants \
  --changed-since=origin/main \
  fmt

However, it gives me different results than

pants fmt ::

Meaning, the same files are formatted differently (namely that refers to

isort

) is this expected behaviour ?

This is a well-known limitation of Pants+isort: isort attempts to classify which top-level packages are first-party vs third-party by looking at the first-party sources (it assumes it has a full view of them). However, Pants by design only exposes to isort the files it actually needs to operate on. In this case, just the files that have changed.

ah, I see, makes sense, thank you

The workaround is to configure the known_first_party packages explicitly in isort.cfg/pyproject.toml

That worked, thank you!