changes<Value> method

Stream<StoreChange<Value>> changes<Value>(StoreMapper<Value, State> mapper)

Stream of changes of values state

Using mapper you can select values you want to listen In contrast to updates this stream returns pairs of values - new state and previous state, so you can easily compare them if needed

Stream<StoreChange<StatefulData<List<Post>>?>> get postsChangesStream => useLocalInstance<PostsInteractor>().changes((state) => state.posts);

Implementation

Stream<StoreChange<Value>> changes<Value>(StoreMapper<Value, State> mapper) {
  if (_isDisposed) {
    throw const IllegalStateException(
      message: 'Can\'t call changes after dispose.',
    );
  }

  return _state.stream.map(
    (event) => StoreChange(
      mapper(event.previous ?? event.next!),
      mapper(event.next as State),
    ),
  );
}