fix onAuthStateChanged binding (#4945)

uny · web-flow · commit 22c2621c594e · 2021-05-27T11:19:42.000-07:00
diff --git a/packages-exp/auth-exp/src/core/auth/auth_impl.ts b/packages-exp/auth-exp/src/core/auth/auth_impl.ts
@@ -506,7 +506,7 @@ export class AuthImpl implements AuthInternal, _FirebaseService {
     const cb =
       typeof nextOrObserver === 'function'
         ? nextOrObserver
-        : nextOrObserver.next;
+        : nextOrObserver.next.bind(nextOrObserver);
 
     const promise = this._isInitialized
       ? Promise.resolve()
