Yeah, I used babel to convert it and its working fine. I thought it’s still important to let you now as it will be overwritten with your updates otherwise.
The problem is that if you combine js-files, other features will not work as well, which happened in my case.
I’m having almost 6% of my users on IE11 – not huge but i don’t want them to have a bad experience. Hopefully, this will decrease now since Microsoft will push updates now for Chromium.
best and thanks,