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17 lines
321 B
TypeScript
17 lines
321 B
TypeScript
import { useRef, useEffect } from 'react';
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/**
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* Returns the previous state of the passed in value.
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* On first render, undefined is returned.
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*/
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export function usePrevious<T>(value: T): T | undefined {
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const ref = useRef<T>();
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useEffect(() => {
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ref.current = value;
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}, [value]);
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return ref.current;
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}
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