Fix TypeScript errors in hub-api-ts test

Author: onmax

starters/hub-api-ts/src/tests/hub-api.browser.test.ts

@@ -32,7 +32,7 @@ it('opens Hub popup and verifies it loads the Hub interface', async () => {
 
   // Override window.open to capture the popup reference
   const originalOpen = window.open
-  window.open = function (...args: Parameters<typeof window.open>) {
+  window.open = function (...args: Parameters<typeof window.open>): Window | null {
     const url = args[0]?.toString() || ''
 
     // Check if it's the Hub
@@ -41,12 +41,12 @@ it('opens Hub popup and verifies it loads the Hub interface', async () => {
       hubPopupUrl = url
 
       // Actually open the popup so we can inspect it
-      hubPopup = originalOpen.apply(window, args)
+      hubPopup = originalOpen.apply(window, args) as Window | null
       return hubPopup
     }
 
-    return originalOpen.apply(window, args)
-  } as typeof window.open
+    return originalOpen.apply(window, args) as Window | null
+  }
 
   // Import and initialize the app
   await import('../main')