cpx watches irrelevant files, while I want it to watch only one file

[arian-h]

I use cpx like this:
cpx "./bundle.js" ../../resources/public/js --watch
and I expect it to watch only one file: bundle.js
but it watches many other irrelevant files. I have node_modules directory in the same directory I run cpx (where bundle.js is located), and it watches all files in the node_modules directory.

[arian-h]

And I just noticed that it only creates an empty file in destination. any idea why this happens ?