Perform the action to load emotions

middleware.dart

List<Middleware<EmotionAppState>> createLoginMiddleware(
    [DataProvider provider]) {
  final loadEmotions = _loadEmotions(provider);

  return [
    TypedMiddleware<EmotionAppState, LoadEmotions>(loadEmotions)
  ];
}

Middleware<EmotionAppState> _loadEmotions(DataProvider provider) {
  return (Store<EmotionAppState> store, action, NextDispatcher next) async {
    List<SavedDetail> emotions = await provider.getEmotions();
    next(LoadedEmotions(details: emotions));
  };
}