message: types(@vant/use): linkChildren param is optional
diff: @@ -61,7 +61,7 @@ export function useChildren(key: string | symbol) {
  const internalChildren: ComponentInternalInstance[] = reactive([]);
  const parent = getCurrentInstance()!;
  - const linkChildren = (value: any) => {
  + const linkChildren = (value?: any) => {
  const link = (child: ComponentInternalInstance) => {
  if (child.proxy) {
  internalChildren.push(child);
  