import { animate, onScroll, utils } from 'animejs';

const [ $value ] = utils.$('.value');

let completions = 0;

animate('.square', {
  x: '15rem',
  rotate: '1turn',
  ease: 'linear',
  autoplay: onScroll({
    container: '.scroll-container',
    enter: 'bottom top',
    leave: 'center bottom',
    sync: .5,
    debug: true,
    onSyncComplete: () => $value.textContent = ++completions,
  })
});

<div class="scroll-container scroll-y">
  <div class="scroll-content grid square-grid">
    <div class="scroll-section padded sticky">
      <div class="large row">
        <pre class="large log row">
          <span class="label">completions</span>
          <span class="value">0</span>
        </pre>
      </div>
    </div>
    <div class="scroll-section padded">
      <div class="large row">
        <div class="square"></div>
      </div>
    </div>
    <div class="scroll-section"></div>
  </div>
</div>