react-native-rolling-bar/src/util/useInterval.ts

Rolling bar (banner) UI for React Native

// by Dan Abramov
// https://overreacted.io/making-setinterval-declarative-with-react-hooks/

import { useRef, useEffect } from 'react';

export default function useInterval(callback: Function, delay: number) {
  const savedCallback = useRef<Function>();

  useEffect(() => {
    savedCallback.current = callback;
  });

  useEffect(() => {
    function tick() {
      savedCallback.current?.();
    }

    let id = setInterval(tick, delay);
    return () => clearInterval(id);
  }, [delay]);
}