/* Notification */
type NotificationPermission = 'default' | 'denied' | 'granted';
type NotificationDirection = 'auto' | 'ltr' | 'rtl';
type VibratePattern = number | Array<number>;
type NotificationAction = { action: string, title: string, icon?: string };
type NotificationOptions = {
  dir: NotificationDirection,
  lang: string,
  body: string,
  tag: string,
  image: string,
  icon: string,
  badge: string,
  sound: string,
  vibrate: VibratePattern,
  timestamp: number,
  renotify: boolean,
  silent: boolean,
  requireInteraction: boolean,
  data: ?any,
  actions: Array<NotificationAction>,
};

declare class Notification extends EventTarget {
  constructor(title: string, options?: $Shape<NotificationOptions>): void;
  static permission: NotificationPermission;
  static requestPermission(
    callback?: (perm: NotificationPermission) => mixed,
  ): Promise<NotificationPermission>;
  static maxActions: number;
  onclick: (evt: Event) => any;
  onerror: (evt: Event) => any;
  title: string;
  dir: NotificationDirection;
  lang: string;
  body: string;
  tag: string;
  image: string;
  icon: string;
  badge: string;
  sound: string;
  vibrate: Array<number>;
  timestamp: number;
  renotify: boolean;
  silent: boolean;
  requireInteraction: boolean;
  data: any;
  actions: Array<NotificationAction>;

  close(): void;
}