index.ts

export interface State {
  products: fromProducts.State;
  login:    fromAuth.State;
}

const reducers = {
  products: fromProducts.reducer,
  login:    fromAuth.reducer
};

export function store(state: any, action: any) {
  const store: ActionReducer<State> = compose(combineReducers)(reducers);
  return store(state, action);
}

export const getLoginState   = (state: State) => state.login;
export const getLoginLoaded  = createSelector(getLoginState, fromAuth.getLoaded);
export const getLoginLoading = createSelector(getLoginState, fromAuth.getLoading);
export const getLoginFailed  = createSelector(getLoginState, fromAuth.getFailed);
export const getLoggedUser   = createSelector(getLoginState, fromAuth.getLoggedUser);