Notification API [to be implemented]

Notification 应该跟 EventLog 结合在一起，EventLog 应该有个 UI 界面。 当前这个模块是基于 react-notifications 做的，要看看它的可扩展性如何，如果不行那就要自己做一个替代品。

interface NotificationProps {
  action: string = 'Dismiss'
  key: string = Date.now()
  dismissAfter: string = 600
  type: enum([ERROR, INFO])
  message: string
}

interface NotificationManager {
  private removeNotification (notifKey: string): void
  private addNotification (notification: NotificationProps): Function
  // return a dismiss function, to dismiss the notification added by invoking this method.
  // 下面都是这个 addNotification 函数预先绑定好 notification.type 的 alias

  // 普通类型通知
  info(message: string): Function
  info(notification: NotificationProps): Function
  // 错误类型
  error(message: string): Function
  error(notification: NotificationProps): Function
  // 不显示 popup 通知，直接进 eventLog
  log(message: string): Function
  log(notification: NotificationProps): Function
}