Method on

packages/widget-sdk/src/message/main_message.ts:117–119

* Receiving messages. * @param widgetId * @param type * @param callback

(widgetId: string, type: MessageType, callback: (data: any, messageId?: string) => void)

   * @param callback 
   */
  on(widgetId: string, type: MessageType, callback: (data: any, messageId?: string) => void) {
    this.messageBridge.on(type, interceptor(callback), widgetId, widgetId);
  }

  /**
   * Clear the relevant data when the widget is uninstalled.