To be clear, it works perfectly fine as long as I don't add TweenMax to the scripts property in .angular-cli.json. So there really is no problem to solve.   With that out of the way... I get the following error in the console of the page (not the terminal): ERROR TypeError: gsap_1.TimelineMax is not a constructor I import TimelineMax like so: import { TimelineMax, Power2 } from 'gsap'; in my component.  I can also import TweenMax in the same fashion (if I needed to). Why would I