gsap-plugins
This skill provides documentation and implementation guidance for GSAP plugins including ScrollToPlugin, ScrollSmoother, Flip, Draggable, SVG morphing, text animation, physics, and easing plugins. Use this skill when working with GSAP plugin registration, scroll animations, flip animations, draggable elements, SVG drawing effects, text effects, or custom easing curves in projects using the GSAP library.
git clone --depth 1 https://github.com/mxyhi/ok-skills /tmp/gsap-plugins && cp -r /tmp/gsap-plugins/gsap-skills/gsap-plugins ~/.claude/skills/gsap-pluginsSKILL.md
# GSAP Plugins
## When to Use This Skill
Apply when using or reviewing code that uses GSAP plugins: registering plugins, scroll-to, flip/FLIP animations, draggable elements, SVG (DrawSVG, MorphSVG, MotionPath), text (SplitText, ScrambleText), physics, easing plugins (CustomEase, EasePack, CustomWiggle, CustomBounce), or GSDevTools. ScrollTrigger has its own skill (gsap-scrolltrigger).
**Related skills:** For core tweens use **gsap-core**; for ScrollTrigger use **gsap-scrolltrigger**; for React use **gsap-react**.
## Licensing & Install (important)
Every GSAP plugin is **free**, including for commercial use. Since [Webflow's acquisition of GSAP](https://gsap.com/blog/webflow-GSAP/), Club GSAP is no longer a paid tier and **no plugin requires a membership, license key, or auth token** — this includes formerly Club-only plugins (**SplitText**, **MorphSVG**, etc.).
- ✅ Install everything from the public `gsap` npm package: `npm install gsap`. All plugins are included — import them as `gsap/SplitText`, `gsap/MorphSVGPlugin`, etc.
- ❌ Do **not** generate an `.npmrc` with a GreenSock auth token, suggest the private `npm.greensock.com` registry, or tell users to sign up for Club GSAP to access a plugin. Those instructions are outdated.
## Registering Plugins
Register each plugin once so GSAP (and bundlers) know to include it. Use **gsap.registerPlugin()** with every plugin used in the project:
```javascript
import gsap from "gsap";
import { ScrollToPlugin } from "gsap/ScrollToPlugin";
import { Flip } from "gsap/Flip";
import { Draggable } from "gsap/Draggable";
gsap.registerPlugin(ScrollToPlugin, Flip, Draggable);
```
- ✅ Register before using the plugin in any tween or API call.
- ✅ In React, register at top level or once in the app (e.g. before first useGSAP); do not register inside a component that re-renders. useGSAP is a plugin that needs to be registered before use.
## Scroll
### ScrollToPlugin
Animates scroll position (window or a scrollable element). Use for “scroll to element” or “scroll to position” without ScrollTrigger.
```javascript
gsap.registerPlugin(ScrollToPlugin);
gsap.to(window, { duration: 1, scrollTo: { y: 500 } });
gsap.to(window, { duration: 1, scrollTo: { y: "#section", offsetY: 50 } });
gsap.to(scrollContainer, { duration: 1, scrollTo: { x: "max" } });
```
**ScrollToPlugin — key config (scrollTo object):**
| Option | Description |
|--------|-------------|
| `x`, `y` | Target scroll position (number), or `"max"` for maximum |
| `element` | Selector or element to scroll to (for scroll-into-view) |
| `offsetX`, `offsetY` | Offset in pixels from the target position |
### ScrollSmoother
Smooth scroll wrapper (smooths native scroll). Requires ScrollTrigger and a specific DOM structure (content wrapper + smooth wrapper). Use when smooth, momentum-style scroll is needed. See GSAP docs for setup; register after ScrollTrigger. DOM structure would look like:
```html
<body>
<div id="smooth-wrapper">
<div id="smooth-content">
<!--- ALL YOUR CONTENT HERE --->
</div>
</div>
<!-- position: fixed elements can go outside --->
</body>
```
## DOM / UI
### Flip
Capture state with `Flip.getState()`, then apply changes (e.g. layout or class changes), then use `Flip.from()` to animate from the previous state to the new state (FLIP: First, Last, Invert, Play). Use when animating between two layout states (lists, grids, expanded/collapsed).
```javascript
gsap.registerPlugin(Flip);
const state = Flip.getState(".item");
// change DOM (reorder, add/remove, change classes)
Flip.from(state, { duration: 0.5, ease: "power2.inOut" });
```
**Flip — key config (Flip.from vars):**
| Option | Description |
|--------|-------------|
| `absolute` | Use `position: absolute` during the flip (default: `false`) |
| `nested` | When true, only the first level of children is measured (better for nested transforms) |
| `scale` | When true, scale elements to fit (avoids stretch); default `true` |
| `simple` | When true, only position/scale are animated (faster, less accurate) |
| `duration`, `ease` | Standard tween options |
#### More information
https://gsap.com/docs/v3/Plugins/Flip
### Draggable
Makes elements draggable, spinnable, or throwable with mouse/touch. Use for sliders, cards, reorderable lists, or any drag interaction.
```javascript
gsap.registerPlugin(Draggable, InertiaPlugin);
Draggable.create(".box", { type: "x,y", bounds: "#container", inertia: true });
Draggable.create(".knob", { type: "rotation" });
```
**Draggable — key config options:**
| Option | Description |
|--------|-------------|
| `type` | `"x"`, `"y"`, `"x,y"`, `"rotation"`, `"scroll"` |
| `bounds` | Element, selector, or `{ minX, maxX, minY, maxY }` to constrain drag |
| `inertia` | `true` to enable throw/momentum (requires InertiaPlugin) |
| `edgeResistance` | 0–1; resistance when dragging past bounds |
| `cursor` | CSS cursor during drag |
| `onDragStart`, `onDrag`, `onDragEnd` | Callbacks; receive event and target |
| `onThrowUpdate`, `onThrowComplete` | Callbacks when inertia is active |
### Inertia (InertiaPlugin)
Works with Draggable for momentum after release, or track the inertia/velocity of any property of any object so that it can then seamlessly glide to a stop using a simple tween. Register with Draggable when using `inertia: true`:
```javascript
gsap.registerPlugin(Draggable, InertiaPlugin);
Draggable.create(".box", { type: "x,y", inertia: true });
```
Or track velocity of a property:
```javascript
InertiaPlugin.track(".box", "x");
```
Then use `"auto"` to continue the current velocity and glide to a stop:
```javascript
gsap.to(obj, { inertia: { x: "auto" } });
```
### Observer
Normalizes pointer and scroll input across devices. Use for swipe, scroll direction, or custom gesture logic without tying directly to scroll position like ScrollTrigger.
```javascript
gsap.registerPlugin(Observer);
Observer.create({
target: "#area",
onUp: () => {},
onDown: () => {},
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