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# `useUnmount`
React lifecycle hook that calls a function when the component will unmount. Use `useLifecycles` if you need both a mount and unmount function.
## Usage
```jsx
import {useUnmount} from 'react-use';
const Demo = () => {
useUnmount(() => alert('UNMOUNTED'));
return null;
};
```
## Reference
```ts
useUnmount(fn: () => void | undefined);
```
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