login.selectors.ts

import { createSelector, createFeatureSelector } from '@ngrx/store';

// <{ isLogin: boolean, errorMessage: string }>はstoreの型、reducerに書いたやつ
// 'LoginState'はキー。好きな名前でOK
export const selectFeature = createFeatureSelector<{ isLogin: boolean, errorMessage: string }>('LoginState');

// getIsLoginというselectorを作成し、storeからisLoginを取得
export const getIsLogin = createSelector(
  selectFeature,
  (state) => state.isLogin
);

// getErrorMessageというselectorを作成し、storeからerrorMessageを取得
export const getErrorMessage = createSelector(
  selectFeature,
  (state) => state.errorMessage
);