Local emulator使用時にホットリロードすると発生するエラーの対処法[web]

こんなエラーが...

Firestore has already been started and its settings can no longer be changed. You can only modify settings before calling any other methods on a Firestore object.

対処法

main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  FirebaseFunctions.instance.useFunctionsEmulator('localhost', 5001);
  try {
    FirebaseFirestore.instance.useFirestoreEmulator('localhost', 8080);
  } catch (e) {
    print(e);
  }
  runApp(MyApp());
}

詳細はflutterfireのissueに！