Dart wrapper via `dart:js` for webusb

Hi,

First of all, thanks for your package and this help for me to connect my local mac machine POS USB printer from flutter web. Everything good and i able to connect and send the data. but the problem is, the data that is being printed in printer is not readable character. so i need to convert the data into correct format and send to transferOut api.

Code is below.

static Future<void> connectUsbPrinter() async {
   bool canUse = canUseUsb();
   if (canUse) {
    //* connect the specific USB printer device using the device's vendor id and product id.
     UsbDevice requestDevice = await usb.requestDevice(
       RequestOptions(
         filters: [
           RequestOptionsFilter(
             vendorId: 0x04B8,
             productId: 0x0E02,
           ),
         ],
       ),
     );
     
        await requestDevice.open();
        await requestDevice.reset();
        int firstInterfaceNumber =
        requestDevice.configuration?.interfaces[0].interfaceNumber ?? 0;
        await requestDevice.claimInterface(firstInterfaceNumber);


//* i am using dart-pdf package to generate the pdf document with 80 mm size and if i print manually 
//*the generated pdf from flutter web, then all is good. but my expectation is send the pdf data to printer directly but 
based on the current limitation in dart-pdf, printing package, i was unable to send data to local printer directly from flutter web. 
//*but later based on some research, i ended up your package to connect the local printer from flutter web using webusb package. 

          //* The below function actually generates the pdf and respond the data in Uint8List type. now i want to send this data to 
          //* your transferOut api to printer in printable format.

          final pdfDataInUint8ListType = await generatePdf(PdfPageFormat.roll80);

//* here is the link for dart-pdf pacakge how to connect the printer and how to convert Uint8List type printable format.
[https://github.com/DavBfr/dart_pdf/wiki/Document-Output#using-another-plugin]

         //* this is the api from web_usb to send data to device.  This is how i am sending today but its not printing in readable 
         //* format.

          var usbOutTransferResult =   await requestDevice.transferOut(1, pdfDataInUint8ListType);
          
         //* all of them are working and i am able to connect the local machine device from flutter web and able to send the data 
         //*but the problem is, data is being printed as undisplayable character in paper.  as per dart-pdf page example,  i see below code to convert from Uint8List to some printable format. I dont know whether i can use this to trasferOut api from this code returns List<int> type but transferOut api expected TypedData. your makeBlock function returns array length error.
         
  Future<void> printTicket() async {
  final printer = PrinterNetworkManager('192.168.0.123');
  final res = await printer.connect();

  if (res != PosPrintResult.success) {
    throw Exception('Unable to connect to the printer');
  }

  final profile = await CapabilityProfile.load();
  final generator = Generator(PaperSize.mm80, profile);
  var ticket = <int>[];

  await for (var page
      in Printing.raster(await _generateTicket(), dpi: dpi)) {
    final image = page.asImage();
    ticket += generator.image(image);
    ticket += generator.feed(2);
    ticket += generator.cut();
  }

  printer.printTicket(ticket);
  printer.disconnect();
}
     
     //* ideally the question is, how to convert the Uint8List to printable character type and send to transferOut api. transferOut api accepts TypedData type to send data.
        
   }

I looked at your example in the below link. but it seems to be ledger nano device. i want to do the same for USB printer. https://github.com/woodemi/web_usb.dart/blob/master/example/lib/ledger_nano_s_page.dart

Can you please share example of converting Uint8List type TypedData so that it can print in readable character?

Appreciate your response.