// main.jsimport QRCode from 'qrcode';class Parser {  constructor() {    this.qris = "";  }  parseQris(qris, amount) {    const amountLength = amount.length;    const tag54 = `54${String(amountLength).padStart(2, "0")}${amount}`;    qris = this.removeTag54(qris);    const tag63Position = qris.indexOf("6304");    if (tag63Position === -1) throw new Error("tag 63 not found");    const modifiedPayload =      qris.slice(0, tag63Position) + tag54 + qris.slice(tag63Position);    const payloadWithoutCrc = modifiedPayload.slice(0, -4);    const newCrc = this.calculateCrc(payloadWithoutCrc);    this.qris = `${payloadWithoutCrc}${newCrc}`;    return this.qris;  }  removeTag54(qris) {    let position = 0;    let result = "";    while (position < qris.length) {      if (position + 2 > qris.length) throw new Error("invalid qris");      const tag = qris.substring(position, position + 2);      position += 2;      if (position + 2 > qris.length) throw new Error("invalid qris");      const lengthStr = qris.substring(position, position + 2);      const length = parseInt(lengthStr, 10);      if (Number.isNaN(length)) throw new Error("invalid qris");      position += 2;      if (position + length > qris.length) throw new Error("invalid qris");      const value = qris.substring(position, position + length);      position += length;      if (tag !== "54") result += tag + String(length).padStart(2, "0") + value;    }    return result;  }  calculateCrc(payload) {    let crc = 0xffff;    const polynomial = 0x1021;    for (let i = 0; i < payload.length; i++) {      crc ^= payload.charCodeAt(i) << 8;      for (let j = 0; j < 8; j++) {        crc = (crc & 0x8000) ? ((crc << 1) ^ polynomial) & 0xffff : (crc << 1) & 0xffff;      }    }    return crc.toString(16).toUpperCase().padStart(4, "0");  }}// — pakai di sini —const parser = new Parser();const result = parser.parseQris(  "PASTE_QRIS_STATIS_DISINI",  // ganti dengan QRIS statis  "50000"                     // ganti dengan nominal (contoh: 50000 = Rp 50.000));// Simpan sebagai file PNGawait QRCode.toFile('qris-dinamis.png', result, {  errorCorrectionLevel: 'M',  width: 512,  margin: 2});console.log('QR saved: qris-dinamis.png');