types(@vant/use): improve Ref param typing

packages/vant-use/src/useClickAway/README.md

@@ -60,7 +60,7 @@ export default {
 
 ```ts
 function useClickAway(
-  target: Element | Ref<Element>,
+  target: Element | Ref<Element | undefined>,
   listener: EventListener,
   options?: Options
 ): void;

packages/vant-use/src/useClickAway/index.ts

@@ -7,7 +7,7 @@ export type UseClickAwayOptions = {
 };
 
 export function useClickAway(
-  target: Element | Ref<Element>,
+  target: Element | Ref<Element | undefined>,
   listener: EventListener,
   options: UseClickAwayOptions = {}
 ) {
@@ -19,7 +19,7 @@ export function useClickAway(
 
   const onClick = (event: Event) => {
     const element = unref(target);
-    if (!element.contains(event.target as Node)) {
+    if (element && !element.contains(event.target as Node)) {
       listener(event);
     }
   };

packages/vant-use/src/useRect/README.md

@@ -31,7 +31,7 @@ export default {
 ### 类型定义
 
 ```ts
-function useRect((Element | Window) | Ref<Element | Window>): DOMRect;
+function useRect((Element | Window) | Ref<Element | Window | undefined>): DOMRect;
 ```
 
 ### 返回值

packages/vant-use/src/useRect/index.ts

@@ -5,7 +5,7 @@ function isWindow(val: unknown): val is Window {
 }
 
 export const useRect = (
-  elementRef: (Element | Window) | Ref<Element | Window>
+  elementRef: (Element | Window) | Ref<Element | Window | undefined>
 ) => {
   const element = unref(elementRef);
 
@@ -23,7 +23,7 @@ export const useRect = (
     };
   }
 
-  if (element.getBoundingClientRect) {
+  if (element && element.getBoundingClientRect) {
     return element.getBoundingClientRect();
   }
 

packages/vant-use/src/useScrollParent/README.md

@@ -37,7 +37,9 @@ export default {
 ### 类型定义
 
 ```ts
-function useScrollParent(element: Ref<Element>): Ref<Element>;
+function useScrollParent(
+  element: Ref<Element | undefined>
+): Ref<Element | Window | undefined>;
 ```
 
 ### 参数

packages/vant-use/src/useScrollParent/index.ts

@@ -39,7 +39,7 @@ function getScrollParent(el: Element, root: ScrollElement = window) {
 }
 
 export function useScrollParent(el: Ref<Element | undefined>) {
-  const scrollParent = ref();
+  const scrollParent = ref<Element | Window>();
 
   onMounted(() => {
     if (el.value) {