# useMotionValueEvent
> Subscribe to motion value store changes with automatic cleanup.
**Source:** [https://motion.svelte.page/docs/use-motion-value-event](https://motion.svelte.page/docs/use-motion-value-event)
---
`useMotionValueEvent` manages subscriptions to motion value store changes. It skips the initial synchronous emission that Svelte stores produce on subscribe, so the callback only fires on actual *changes*.
```svelte
```
## Usage
### Import
```svelte
```
### Subscribe to changes
Pass a readable store, the event type `'change'`, and a callback:
```svelte
scale.set(2)}
onpointerleave={() => scale.set(1)}
>
Hover me
```
### Available events
| Event | Description |
|-------|-------------|
| `'change'` | Fires whenever the store value updates (after the initial emission). |
### Cleanup
`useMotionValueEvent` returns an unsubscribe function. Call it inside `onDestroy` or at the end of an `$effect`:
```svelte
```
```svelte
```
### Advanced — raw subscribe
For full control you can use `store.subscribe()` directly. Note that Svelte stores fire the callback immediately with the current value on subscribe:
```svelte
```
`useMotionValueEvent` is preferred when you only want to react to *changes* and not the initial value.
## API Reference
### Signature
```ts
useMotionValueEvent(
store: Readable,
event: 'change',
callback: (latest: T) => void
): () => void
```
### Parameters
- **store** `Readable` — any Svelte readable store (e.g. `useSpring`, `useTransform`, `useTime`)
- **event** `'change'` — the event type to listen for
- **callback** `(latest: T) => void` — invoked with the latest value on each change
### Returns
`() => void` — an unsubscribe function that stops the subscription.
## See also
- [Motion values overview](/docs/motion-values) — introduction to motion value stores
- [useSpring](/docs/use-spring) — spring-animated store
- [useTransform](/docs/use-transform) — map and transform stores
- [useVelocity](/docs/use-velocity) — derive velocity from a store
---
Based on [Motion's useMotionValueEvent](https://motion.dev/docs/react-use-motion-value-event) API.