Add assert

Author: schmidt-sebastian

packages/firestore/src/remote/remote_store.ts

@@ -772,6 +772,10 @@ export class RemoteStore implements TargetMetadataProvider {
     // fresh auth token for the new user and re-fill the write pipeline with
     // new mutations from the LocalStore (since mutations are per-user).
     logDebug(LOG_TAG, 'RemoteStore received new credentials');
+    debugAssert(
+      !this.offlineCauses.has(OfflineCause.CredentialChange),
+      'Only one credential change should be processed at a time'
+    );
     this.offlineCauses.add(OfflineCause.CredentialChange);
 
     await this.disableNetworkInternal();