Update index.js (#14528)

* Update index.js

* Update index.js

* Update examples/with-firebase-authentication/pages/index.js
Co-authored-by: NLuis Alvarez D <luis@vercel.com>

examples/with-firebase-authentication/pages/index.js

@@ -15,7 +15,6 @@ const Index = () => {
     user ? ['/api/getFood', user.token] : null,
     fetcher
   )
-
   if (!user) {
     return (
       <>
@@ -52,7 +51,11 @@ const Index = () => {
         </Link>
       </div>
       {error && <div>Failed to fetch food!</div>}
-      {data && <div>Your favorite food is {data.food}.</div>}
+      {data ? (
+        <div>Your favorite food is {data.food}.</div>
+      ) : (
+        <div>Loading...</div>
+      )}
     </div>
   )
 }