import { createTimer, utils } from 'animejs';

const [ $range ] = utils.$('.range');
const [ $playPauseButton ] = utils.$('.play-pause');
const [ $time ] = utils.$('.time');

const updateButtonLabel = timer => {
  $playPauseButton.textContent = timer.paused ? 'Play' : 'Pause';
}

const timer = createTimer({
  duration: 2000,
  autoplay: false,
  onUpdate: self => {
    $range.value = self.currentTime;
    $time.innerHTML = self.currentTime;
    updateButtonLabel(self);
  },
  onComplete: updateButtonLabel,
});


const seekTimer = () => timer.seek(+$range.value);

const playPauseTimer = () => {
  if (timer.paused) {
    timer.play();
  } else {
    timer.pause();
    updateButtonLabel(timer);
  }
}

$range.addEventListener('input', seekTimer);
$playPauseButton.addEventListener('click', playPauseTimer);

<div class="large centered row">
  <div class="half col">
    <pre class="large log row">
      <span class="label">current time</span>
      <span class="time value lcd">0</span>
    </pre>
  </div>
</div>
<div class="medium centered row">
  <fieldset class="controls">
    <input type="range" min=0 max=2000 value=0 class="range" />
    <button style="flex: 0.25;" class="button play-pause">Play</button>
  </fieldset>
</div>