next-ucap-messenger/projects/ucap-webmessenger-app/src/app/store/messenger/sync/state.ts

import { Selector, createSelector } from '@ngrx/store';
import { UserInfo, GroupDetailData } from '@ucap-webmessenger/protocol-sync';

export interface State {
  buddyInfoList: UserInfo[];
  buddy2SyncDate: string;

  groupList: GroupDetailData[];
  group2SyncDate: string;
}

export const initialState: State = {
  buddyInfoList: [],
  buddy2SyncDate: '',
  groupList: [],
  group2SyncDate: ''
};

export function selectors<S>(selector: Selector<any, State>) {
  return {
    buddyInfoList: createSelector(
      selector,
      (state: State) => state.buddyInfoList
    ),
    buddy2SyncDate: createSelector(
      selector,
      (state: State) => state.buddy2SyncDate
    ),
    groupList: createSelector(
      selector,
      (state: State) => state.groupList
    ),
    group2SyncDate: createSelector(
      selector,
      (state: State) => state.group2SyncDate
    ),
    groupListAndBuddyList: createSelector(
      selector,
      (state: State) => {
        return {
          groupList: state.groupList,
          buddyList: state.buddyInfoList
        };
      }
    )
  };
}