import 'package:nyx_printer/nyx_printer.dart';
  ...
  final _nyxPrinterPlugin = NyxPrinter();

  Future<void> printImage() async {
    final image = await rootBundle.load("images/img.png");
    await _nyxPrinterPlugin.printImage(image.buffer.asUint8List());
  }

  Future<void> printText() async {
      await _nyxPrinterPlugin.printText(
        "Grocery Store",
        textFormat: NyxTextFormat(
          textSize: 32,
          align: NyxAlign.center,
          font: NyxFont.monospace,
          style: NyxFontStyle.boldItalic,
        ),
      );
  }

  Future<void> printQrCode() async {
      await _nyxPrinterPlugin.printQrCode(
        "123456789",
        width: 200,
        height: 200,
      );
  }

  Future<void> printBarcode() async {
      await _nyxPrinterPlugin.printBarcode(
        "123456789",
        width: 300,
        height: 40,
      );
  }