index.js

import React from 'react';
import ReactDOM from 'react-dom';
import useCountDown from "../src"

const buttonStyle = { marginRight: '10px' };

const App = () => {
  const [timeLeft, actions] = useCountDown(10000, 500);
  return (
    <div style={{ textAlign: 'center' }}>
      <h1 id="time-left">{(timeLeft / 1000).toFixed(2)}</h1>
      <button
        id="start"
        style={buttonStyle}
        onClick={() => actions.start()}
      >
        Start
      </button>
      <button
        id="restart"
        style={buttonStyle}
        onClick={() => actions.start(4200)}
      >
        Restart with 4.2s
      </button>
      <button
        id="pause"
        style={buttonStyle}
        onClick={() => actions.pause()}
      >
        Pause
      </button>
      <button
        id="resume"
        style={buttonStyle}
        onClick={() => actions.resume()}
      >
        Resume
      </button>
      <button
        id="reset"
        onClick={() => actions.reset()}
      >
        Reset
      </button>
    </div>
  );
};

const MOUNT_NODE = document.getElementById('react-root');
ReactDOM.render(<App />, MOUNT_NODE);