php-flarum/js/forum/src/components/index-nav-item.js

import NavItem from 'flarum/components/nav-item'

export default class IndexNavItem extends NavItem {
  static props(props) {
    props.onclick = props.onclick || function() {
      app.cache.discussionList = null;
      m.redraw.strategy('none');
    };
  }
}