<ul data-accordion>
 <li data-accordion-item> <!-- index 0 -->
 <div data-accordion-item-body></div>
 <li>
 <li data-accordion-item> <!-- index 1 and so on! -->
 <div data-accordion-item-body></div>
 <li>
</ul>

const Rollerskate = require('rollerskate');
const rollerskate = new Rollerskate(window);
rollerskate.expandAll();
rollerskate.collapseAll();
rollerskate.item(0).expand();
rollerskate.item(0).collapse();