Custom Desktop Software

import { SerialPort } from 'serialport';

export class ThermalPrinterDriver {
  private port: SerialPort;

  async printReceipt(transaction: SaleRecord): Promise<void> {
    const buffer = Buffer.concat([
      Buffer.from([0x1B, 0x40]), // ESC @ Initialize
      Buffer.from([0x1B, 0x61, 0x01]), // Center Align
      Buffer.from(`${transaction.storeName}\n`),
      Buffer.from([0x1B, 0x61, 0x00]), // Left Align
      Buffer.from(`Receipt: ${transaction.receiptId}\n`),
      Buffer.from(`Total: PKR ${transaction.total}\n`),
      Buffer.from([0x1D, 0x56, 0x41, 0x10]), // Full Cut
    ]);
    await this.port.write(buffer);
  }
}