File "use-previous.ts"
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import {useEffect, useRef} from 'react';
export function usePrevious<T>(value: T) {
const ref = useRef<T>();
// Store current value in ref
useEffect(() => {
ref.current = value;
}, [value]); // Only re-run if value changes
// Return previous value (happens before update in useEffect above)
return ref.current;
}