chore: move utils

src-next/utils/vnodes.ts

@@ -0,0 +1,33 @@
+import { VNode } from 'vue';
+
+function flattenVNodes(vnodes: VNode[]) {
+  const result: VNode[] = [];
+
+  function traverse(vnodes: VNode[]) {
+    vnodes.forEach((vnode) => {
+      result.push(vnode);
+
+      if (vnode.componentInstance) {
+        traverse(vnode.componentInstance.$children.map((item) => item.$vnode));
+      }
+
+      if (vnode.children) {
+        traverse(vnode.children);
+      }
+    });
+  }
+
+  traverse(vnodes);
+  return result;
+}
+
+// sort children instances by vnodes order
+export function sortChildren(children: Vue[], parent: Vue) {
+  const { componentOptions } = parent.$vnode;
+  if (!componentOptions || !componentOptions.children) {
+    return;
+  }
+
+  const vnodes = flattenVNodes(componentOptions.children);
+  children.sort((a, b) => vnodes.indexOf(a.$vnode) - vnodes.indexOf(b.$vnode));
+}