1  import * as types from './types';
 2  
 3  export const INITIAL_STATE: types.NotificationState = [];
 4  
 5  function showNotification(
 6    state: types.NotificationState,
 7    action: types.ShowNotificationAction
 8  ): types.NotificationState {
 9    return state.concat(action.payload);
10  }
11  
12  function closeNotification(
13    state: types.NotificationState,
14    action: types.CloseNotificationAction
15  ): types.NotificationState {
16    state = [...state];
17    state.splice(state.indexOf(action.payload), 1);
18    return state;
19  }
20  
21  export function notificationsReducer(
22    state: types.NotificationState = INITIAL_STATE,
23    action: types.NotificationsAction
24  ): types.NotificationState {
25    switch (action.type) {
26      case types.NotificationsActions.SHOW:
27        return showNotification(state, action);
28      case types.NotificationsActions.CLOSE:
29        return closeNotification(state, action);
30      default:
31        return state;
32    }
33  }