scrollmagic-plugin-gsap Original animation.gsap.js plugin for ScrollMagic is not compatible with ES6 modules, so it's causing a number of problems to add it in ES6 environment. Use this module to simple wrap ScrollMagic with animation.gsap.js in ES6.    npm install --save scrollmagic-plugin-gsap import * as ScrollMagic from "scrollmagic"; // Or use scrollmagic-with-ssr to avoid server rendering problems import gsap from "gsap";  // Also works with TweenLite