chore: adjust useVisibilityChange

packages/vant-use/src/shared.ts

@@ -0,0 +1 @@
+export const inBrowser = typeof window !== 'undefined';

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

@@ -1,5 +1,6 @@
 import { Ref, unref } from 'vue';
-import { inBrowser, useEventListener } from '../useEventListener';
+import { inBrowser } from '../shared';
+import { useEventListener } from '../useEventListener';
 
 export type UseClickAwayOptions = {
   eventName?: string;

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

@@ -6,8 +6,7 @@ import {
   onUnmounted,
   onDeactivated,
 } from 'vue';
-
-export const inBrowser = typeof window !== 'undefined';
+import { inBrowser } from '../shared';
 
 let supportsPassive = false;
 if (inBrowser) {