mostly finished rewrite

public/node_modules/dom-helpers/esm/siblings.js

@@ -0,0 +1,10 @@
+import collectSiblings from './collectSiblings';
+/**
+ * Collects all previous and next sibling elements of a given element.
+ * 
+ * @param node the element
+ */
+
+export default function siblings(node) {
+  return collectSiblings(node && node.parentElement ? node.parentElement.firstElementChild : null, node);
+}