improved PersistentFragment a little bit

Author: WebReflection

src/dom/persistent-fragment.js

@@ -66,9 +66,8 @@ const valueOf = {
  * @returns {DocumentFragment}
  */
 export function PersistentFragment(fragment) {
-  const firstChild = createComment('<>'), lastChild = createComment('</>');
-  //@ts-ignore
-  fragment.replaceChildren(firstChild, ...fragment.childNodes, lastChild);
+  const firstChild = fragment.insertBefore(createComment('<>'), fragment.firstChild);
+  const lastChild = fragment.appendChild(createComment('</>'));
   checkType = true;
   return defineProperties(fragment, {
     [nodes]: { writable: true, value: children },

types/dom/diff.d.ts

@@ -1,2 +1,2 @@
-declare function _default(a: Node[], b: Node[], get: (entry: Node, action: number) => Node, before?: Node): Node[];
+declare function _default(a: Node[], b: Node[], get: (entry: Node, action: number) => Node, before: Node): Node[];
 export default _default;