Yes, `output.devtoolNamespace: 'no_slashes_here'` fixes the issue, by just using something other than package name, thanks. Sorry for bothering, i should probably read the entire webpack docs from start to finish one day. Stackoverflow couldn't help for days.

I am still a bit confused, why a default of package name including slashes was chosen, but i guess I can wonder about that after some more research on the topic.

Thanks again :)