agenda-paper/src/hooks/use-interval.ts

Show your daily agenda on an ePaper display

import { useEffect, useLayoutEffect, useRef } from 'react';

const useInterval = (callback: () => void, delay: number | null) => {
  const savedCallback = useRef(callback);

  useLayoutEffect(() => {
    savedCallback.current = callback;
  }, [callback]);

  useEffect(() => {
    const tick = () => {
      savedCallback.current();
    };
    if (delay !== null) {
      const id = setInterval(tick, delay);
      return () => clearInterval(id);
    }
  }, [delay]);
};

export default useInterval;