Watch changes and concatenate all.js

Hi,

When watching files I would like to detect changes made in js/concat/*.js.
Currently the watch-task will not rebuild to build/all.js when making changes.
Is this normal behaviour? I would like to split up code from my main js-file using the concat-directory.

I'm working on node v: v14.16.0
Buildozer v: 0.5.0