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# `useEffectOnce`
React lifecycle hook that runs an effect only once.
## Usage
```jsx
import {useEffectOnce} from 'react-use';
const Demo = () => {
useEffectOnce(() => {
console.log('Running effect once on mount')
return () => {
console.log('Running clean-up of effect on unmount')
}
});
return null;
};
```
## Reference
```js
useEffectOnce(effect: EffectCallback);
```
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