@ngrx 4存储返回类型

// 定义存储返回类型
interface AppState {
  counter: number;
  user: User;
}

// 定义存储操作
class IncrementCounter implements Action {
  readonly type = 'INCREMENT_COUNTER';
}

class SetUser implements Action {
  readonly type = 'SET_USER';
  constructor(public payload: User) {}
}

// 定义存储操作的处理函数
function counterReducer(state: number = 0, action: Action) {
  switch (action.type) {
    case 'INCREMENT_COUNTER':
      return state + 1;
    default:
      return state;
  }
}

function userReducer(state: User = null, action: Action) {
  switch (action.type) {
    case 'SET_USER':
      return action.payload;
    default:
      return state;
  }
}

// 创建存储
const reducers = {
  counter: counterReducer,
  user: userReducer
};

const store = createStore(reducers);

// 获取存储中的数据
const counterValue: number = store.getState().counter;
const userValue: User = store.getState().user;

// 更新存储中的数据
store.dispatch(new IncrementCounter());
store.dispatch(new SetUser({ name: 'John', age: 25 }));