GitLab

* style: Added missing typing annotations

* style: Fixed last missing typing annotation

* chore: Fixed missing import

* style: Fixed typing

* refactor: Switched file selection from list to set
Co-authored-by: Philip Meier <github.pmeier@posteo.de>
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>