htc_3_29.swift

public func scope<LocalState, LocalEvent: ComponentableEvent>(
    state toLocalState: @escaping (State) -> LocalState,
    event toGlobalEvent: @escaping (LocalEvent) -> Event,
    feedBacks: [SideEffect<LocalState, LocalEvent>]
) -> Store<LocalState, LocalEvent> where LocalEvent.State == LocalState {
    let localStore = Store<LocalState, LocalEvent>(
        initial: toLocalState(state),
        feedBacks: feedBacks,
        reducer: { localState, localEvent in
            var state = self.state
            self.reducer(&state, toGlobalEvent(localEvent))
            localState = toLocalState(state)
            if localEvent != LocalEvent.updateFromOutside(localState) {
                self.accept(toGlobalEvent(localEvent))
            }
    }
    )
    $state
        .map(toLocalState)
        .removeDuplicates()
        .sink { [weak localStore] newValue in
            localStore?.accept(.updateFromOutside(newValue))
    }
    .store(in: &localStore.disposeBag)
    return localStore
}