react-use-countdown/example/src/index.js

import React from 'react';
import ReactDOM from 'react-dom';
import { useCountdown } from 'cubetiq-react-use-countdown';

const App = () => {
    const { timeleft, start } = useCountdown();
    return (
        <div>
            <button onClick={() => start(10000)}> Start Countdown </button>
            <h1>Time left: {timeleft}</h1>
        </div>
    );
};

ReactDOM.render(<App />, document.querySelector('#root'));