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import { useEffect, useRef } from "react"; export function useInterval(callback: () => any, delay: number) { const intervalRef = useRef<number>(); const callbackRef = useRef(callback); // Without this, if you change the callback, when setInterval ticks again, it // will still call your old callback. // // If you add `callback` to useEffect's deps, it will work fine but the // interval will be reset. useEffect(() => { callbackRef.current = callback; }, [callback]); // Set up the interval: useEffect(() => { intervalRef.current = window.setInterval( () => callbackRef.current(), delay ); // Clear interval if the components is unmounted or the delay changes: return () => window.clearInterval(intervalRef.current); }, [delay]); // Returns a ref to the interval ID in case you want to clear it manually: return intervalRef; }