index.ts

export const getHeroesState = createFeatureSelector<fromHeroes.State>('heroes');
export const getHeroes = createSelector(getHeroesState, state => state.data);
export const getIsLoading = createSelector(getHeroesState, state => state.isLoading);
export const getCurrentPage = createSelector(getHeroesState, state => state.page);
export const getIsFirstPage = createSelector(getHeroesState, state => !state.previous);
export const getIsLastPage = createSelector(getHeroesState, state => !state.next);