jsLogin function Null safety

  1. @JS('login')
void jsLogin(
  1. bool refreshIfAvailable,
  2. void onSuccess(
      ),
    1. void onError(
      1. dynamic
      )
    )

    Implementation

    @JS('login')
    external void jsLogin(
      bool refreshIfAvailable,
      void Function() onSuccess,
      void Function(dynamic) onError,
    );