| # `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); | |
| ``` | |