Sorry, didn’t look for the issue on Github, I thought it was the only topic about it, my bad.
I’ve tried a similar approach to yours (changed directly the main module for testing purposes). But I have the same issue as in Ionic 2 - app.bundle.js - Minification
Anyway, I’ll wait for it to be fixed, thanks for the heads up 
@allpref: I’ve tried YUI compressor, which works great on all my javascript files, but it hanged on app.bundle.js too. That how I found this thread.