MyCrypto/common/reducers/notifications.ts

import {
  CloseNotificationAction,
  Notification,
  NotificationsAction,
  ShowNotificationAction
} from 'actions/notifications';
import { TypeKeys } from 'actions/notifications/constants';
export type State = Notification[];

export const INITIAL_STATE: State = [];

function showNotification(state: State, action: ShowNotificationAction): State {
  return state.concat(action.payload);
}

function closeNotification(state: State, action: CloseNotificationAction): State {
  state = [...state];
  state.splice(state.indexOf(action.payload), 1);
  return state;
}

export function notifications(state: State = INITIAL_STATE, action: NotificationsAction): State {
  switch (action.type) {
    case TypeKeys.SHOW_NOTIFICATION:
      return showNotification(state, action);
    case TypeKeys.CLOSE_NOTIFICATION:
      return closeNotification(state, action);
    default:
      return state;
  }
}