React Countdown

import React, { useState, useEffect } from 'react';
 
const Countdown = (props: { ms: number; delta?: number }) => {
  const [time, setTime] = useState(props.ms);
 
  useEffect(() => {
    const interval = setInterval(() => {
      setTime(prevTime => {
        if (prevTime <= 0) {
          clearInterval(interval);
          return 0;
        }
        return prevTime - (props.delta || 1000);
      });
    }, 1000);
 
    return () => clearInterval(interval);
  }, [props.delta]);
 
  return <div>{time / 1000}s</div>;
};