Hi Akapowl, I Fond the solution. Yes you're right, I wasn't writing it right, but I needed to import Back too. Thanks
import { gsap, Back } from 'gsap';
import { ScrollTrigger } from 'gsap/ScrollTrigger';
if (process.client) {
gsap.registerPlugin(ScrollTrigger);
}
tl_logo: gsap.timeline({paused:true})
this.tl_logo.from('#main-triangle', {rotation:-27, scale: 0, opacity: 0, transformOrigin:"50% 50%", ease: Back.easeOut, duration: 5})