import {useEffect, useRef} from "react";

export default function useInterval(cb: Function, delayMs: number | null) {
  const savedCallback = useRef<Function>();
  
  useEffect(() => {
    savedCallback.current = cb
  }, [cb])
  
  useEffect(() => {
    function tick() {
      savedCallback.current();
    }
    
    if (delayMs !== null) {
      let timerId = setInterval(tick, delayMs)
      return () => clearInterval(timerId)
    }
  }, [delayMs])
}