react countdown timer

1import React from 'react'
2import { useState, useEffect } from 'react';
3
4const Timer = (props:any) => {
5    const {initialMinute = 0,initialSeconds = 0} = props;
6    const [ minutes, setMinutes ] = useState(initialMinute);
7    const [seconds, setSeconds ] =  useState(initialSeconds);
8    useEffect(()=>{
9    let myInterval = setInterval(() => {
10            if (seconds > 0) {
11                setSeconds(seconds - 1);
12            }
13            if (seconds === 0) {
14                if (minutes === 0) {
15                    clearInterval(myInterval)
16                } else {
17                    setMinutes(minutes - 1);
18                    setSeconds(59);
19                }
20            } 
21        }, 1000)
22        return ()=> {
23            clearInterval(myInterval);
24          };
25    });
26
27    return (
28        <div>
29        { minutes === 0 && seconds === 0
30            ? null
31            : <h1> {minutes}:{seconds < 10 ?  `0${seconds}` : seconds}</h1> 
32        }
33        </div>
34    )
35}
36
37export default Timer;

1function App() {
2  const [seconds, setSeconds] = React.useState(10);
3
4  React.useEffect(() => {
5    if (seconds > 0) {
6      setTimeout(() => setSeconds(seconds - 1), 1000);
7    } else {
8      setSeconds('BOOOOM!');
9    }
10  });
11
12  return (
13    <div className="App">
14      <div>
15        {seconds}
16      </div>
17    </div>
18  );
19}

1npm install react-countdown --save