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https://github.com/jellyfin/jellyfin-web
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18 lines
468 B
TypeScript
18 lines
468 B
TypeScript
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import { useEffect, useRef } from 'react';
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/**
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* A hook that returns the previous value of a stateful value.
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* @param value A stateful value created by a `useState` hook.
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* @param initialValue The default value.
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* @returns The previous value.
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*/
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export function usePrevious<T>(value: T, initialValue?: T): T | undefined {
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const ref = useRef<T | undefined>(initialValue);
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useEffect(() => {
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ref.current = value;
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});
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return ref.current;
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}
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