fix(shared): Ensure window object existence (#2913)

* fix(shared): Ensure window object existence before accessing its properties

* add changeset

---------

Co-authored-by: Lennart <lekoarts@gmail.com>

Author: mario-jerkovic

.changeset/rude-plums-move.md

@@ -0,0 +1,5 @@
+---
+"@clerk/shared": patch
+---
+
+Ensure that inside `isValidBrowser()` and `isBrowserOnline()` the existence of `window` is checked before trying to access `window.navigator`

package-lock.json

@@ -52,8 +52,8 @@ export function userAgentIsRobot(userAgent: string): boolean {
  * @returns {boolean}
  */
 export function isValidBrowser(): boolean {
-  const navigator = window?.navigator;
-  if (!inBrowser() || !navigator) {
+  const navigator = inBrowser() ? window?.navigator : null;
+  if (!navigator) {
     return false;
   }
   return !userAgentIsRobot(navigator?.userAgent) && !navigator?.webdriver;
@@ -64,8 +64,8 @@ export function isValidBrowser(): boolean {
  * @returns {boolean}
  */
 export function isBrowserOnline(): boolean {
-  const navigator = window?.navigator;
-  if (!inBrowser() || !navigator) {
+  const navigator = inBrowser() ? window?.navigator : null;
+  if (!navigator) {
     return false;
   }