Function addWatcher

addWatcher(
    listener: (
        event: string,
        device: {
            locationID?: number;
            productID: number;
            productName: string;
            serialNumber?: string;
            vendorID: number;
            vendorName: string;
        },
    ) => void,
): void
Register a listener for USB device connection and disconnection events. The listener is called with two arguments: the event type string ("added" or "removed") and a device-info object with the same fields as attachedDevices().
Parameters
- listener: (
      event: string,
      device: {
          locationID?: number;
          productID: number;
          productName: string;
          serialNumber?: string;
          vendorID: number;
          vendorName: string;
      },
  ) => void
  The function to call when a USB device is added or removed
Returns void