onInit method Null safety
override
    Load token when initialized
Implementation
@override
void onInit() {
  final tokenJson = _storage.get();
  if (tokenJson != null) {
    authToken(AuthToken.fromJson(tokenJson));
  }
  super.onInit();
}Load token when initialized
@override
void onInit() {
  final tokenJson = _storage.get();
  if (tokenJson != null) {
    authToken(AuthToken.fromJson(tokenJson));
  }
  super.onInit();
}