How To Use ScrollMagic with GSAP and Webpack

medoingthings solution has since changed syntax to include "-loader" suffix.

module: {
 loaders: [
   { test: /\.js$/, loader: 'imports-loader?define=>false'}
 ]
}

https://webpack.js.org/guides/migrating/#automatic-loader-module-name-extension-removed

The solution I came across that doesn't require you to alter your webpack.config.js file and actually works for me can be found here: https://github.com/janpaepke/ScrollMagic/issues/665

The gist of it is to make sure you have ScrollMagic and GSAP added via npm (hopefully that's obvious) as well as imports-loader:

npm install --save scrollmagic gsap
npm install --save-dev imports-loader

Then in the file you want to use ScrollMagic with GSAP do the following imports:

import { TimelineMax, TweenMax, Linear } from 'gsap';
import ScrollMagic from 'scrollmagic';
import 'imports-loader?define=>false!scrollmagic/scrollmagic/uncompressed/plugins/animation.gsap';

Using Webpack 4.x and imports-loader 0.8.0

In imports-loader 1.1.0, the syntax of the configuration has changed a bit, so now you have to use the following to get the ScrollMagic plugins to work:

{
  test: [
    path.join(config.root, '/node_modules/scrollmagic/scrollmagic/uncompressed/plugins/jquery.ScrollMagic.js'),
    path.join(config.root, '/node_modules/scrollmagic/scrollmagic/uncompressed/plugins/debug.addIndicators.js')
  ],
  use: [
    {
      loader: 'imports-loader',
      options: {
        additionalCode: 'var define = false;'
      }
    }
  ]
}

Hopefully this helps others.

The Solution

You have to tell Webpack to stop using the AMD syntax by adding the following loader that deactivates the define() method.

module: {
  loaders: [
    { test: /\.js$/, loader: 'imports-loader?define=>false'}

    // Use this instead, if you’re running Webpack v1
    // { test: /\.js$/, loader: 'imports?define=>false'}
  ]
}

Don’t forget to install the loader with npm install imports-loader --save-dev .

Why?

The problem lies in the fact that Webpack supports the AMD (define) and CommonJS (require) syntax. That is why the following factory script within plugins/animation.gsap.js jumps into the first if statement and fails silently. That is why setTween() etc. are never added to the ScrollMagic Constructor.

By telling Webpack not to support the AMD syntax (using the loader mentioned above), the plugin jumps into the second if statement correctly, embracing the CommonJS syntax.

if (typeof define === 'function' && define.amd) {
    // AMD. Register as an anonymous module.
    define(['ScrollMagic', 'TweenMax', 'TimelineMax'], factory);
} else if (typeof exports === 'object') {
    // CommonJS
    // Loads whole gsap package onto global scope.
    require('gsap');
    factory(require('scrollmagic'), TweenMax, TimelineMax);
} else {
    // Browser globals
    factory(root.ScrollMagic || (root.jQuery && root.jQuery.ScrollMagic), root.TweenMax || root.TweenLite, root.TimelineMax || root.TimelineLite);
}

I hope this prevents other people from spending a whole evening trying to figure out what is going on.