import { createDraggable, utils } from 'animejs';

const [ $enableButton ] = utils.$('.enable');

const draggable = createDraggable('.square');

draggable.disable();

const enableDraggable = () => draggable.enable();

$enableButton.addEventListener('click', enableDraggable);

<div class="large centered row">
  <div class="square draggable"></div>
</div>
<div class="large row">
  <fieldset class="controls">
    <button class="button enable">Enable</button>
  </fieldset>
</div>