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# `useUnmountPromise`
A life-cycle hook that provides a higher order promise that does not resolve if component un-mounts.
## Usage
```ts
import useUnmountPromise from 'react-use/lib/useUnmountPromise';
const Demo = () => {
const mounted = useUnmountPromise();
useEffect(async () => {
await mounted(someFunction()); // Will not resolve if component un-mounts.
});
};
```
## Reference
```ts
const mounted = useUnmountPromise();
mounted(promise);
mounted(promise, onError);
```
- `onError` — if promise rejects after the component is unmounted, `onError`
callback is called with the error.
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