How to use the @lrnwebcomponents/haxcms-elements/lib/core/haxcms-site-store.js.store.findItem function in @lrnwebcomponents/haxcms-elements

_computeLocation(itemId, render) {
    if (itemId && render) {
      let item = store.findItem(itemId);
      // ensure it loads fresh
      return item.location + "?" + Math.floor(Date.now() / 1000);
    }
  }
  locationChanged(newValue) {

handleIntersectionCallback(entries) {
    for (let entry of entries) {
      if (Number(entry.intersectionRatio).toFixed(2) >= this.visibleLimit) {
        // now we care
        if (this.itemId) {
          let item = store.findItem(this.itemId);
          this._a = item.location
            .replace("pages/", "")
            .replace("/index.html", "");
          this.isVisible = true;
          setTimeout(() => {
            this.shadowRoot.querySelector("#a").click();
          }, 25);
        }
      }
    }
  }
}