30 lines
703 B
Markdown
30 lines
703 B
Markdown
---
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title: React useIsomporphicEffect hook
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tags: hooks,effect
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author: chalarangelo
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cover: jars-on-shelf-2
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firstSeen: 2021-09-29T05:00:00-04:00
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lastUpdated: 2021-10-13T19:29:39+02:00
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---
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Resolves to `useEffect()` on the server and `useLayoutEffect()` on the client.
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- Use `typeof` to check if the `Window` object is defined. If it is, return the `useLayoutEffect()`. Otherwise return `useEffect()`.
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```jsx
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const useIsomorphicEffect =
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typeof window !== 'undefined' ? React.useLayoutEffect : React.useEffect;
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```
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```jsx
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const MyApp = () => {
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useIsomorphicEffect(() => {
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window.console.log('Hello');
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}, []);
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return null;
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};
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ReactDOM.render(<MyApp />, document.getElementById('root'));
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```
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