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useUpdateEffect.d.ts
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useUpdateEffect.d.ts
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import { EffectCallback, DependencyList } from 'react';
/**
* Runs an effect only when the dependencies have changed, skipping the
* initial "on mount" run. Caution, if the dependency list never changes,
* the effect is **never run**
*
* ```ts
* const ref = useRef<HTMLInput>(null);
*
* // focuses an element only if the focus changes, and not on mount
* useUpdateEffect(() => {
* const element = ref.current?.children[focusedIdx] as HTMLElement
*
* element?.focus()
*
* }, [focusedIndex])
* ```
* @param effect An effect to run on mount
*
* @category effects
*/
declare function useUpdateEffect(fn: EffectCallback, deps: DependencyList): void;
export default useUpdateEffect;
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