declare namespace tinyapp {
  /**
   * 事件对象 https://docs.alipay.com/mini/framework/events#a-namefc3wdba%E4%BA%8B%E4%BB%B6%E5%AF%B9%E8%B1%A1
   */
  interface IBaseEvent {
    readonly type: string;
    readonly timeStamp: number;
    readonly target: {
      readonly tagName: string;
      readonly dataset: Readonly<Record<string, any>>;
      readonly targetDataset: Readonly<Record<string, any>>;
      readonly offsetLeft: number;
      readonly offsetTop: number;
    };
    readonly currentTarget: {
      readonly tagName: string;
      readonly dataset: Readonly<Record<string, any>>;
      readonly offsetLeft: number;
      readonly offsetTop: number;
    };
  }

  interface ICustomEvent extends IBaseEvent {
    /**
     * 自定义事件所携带的数据，如表单组件的提交事件会携带用户的输入信息，
     * 媒体的错误事件会携带错误信息，详细的描述请参考组件定义中各个事件的定义。
     */
    readonly detail: Readonly<Record<string, any>>;
  }

  interface ITouch {
    readonly identifier: number;
    readonly pageX: number;
    readonly pageY: number;
    readonly clientX: number;
    readonly clientY: number;
  }

  interface ICanvasTouch {
    readonly identifier: number;
    readonly x: number;
    readonly y: number;
  }

  interface ITouchEvent extends IBaseEvent {
    readonly touches: ReadonlyArray<ITouch | ICanvasTouch>;
    readonly changedTouches: ReadonlyArray<ITouch | ICanvasTouch>;
  }
}