const BPstr = '===='; // blueprint base64 string
const base64 = BPstr.substring(1);
const strDecoded = atob(base64); // length%4 should be = 0, else add more ====
const binData = new Uint8Array(strDecoded.split('').map((x) => x.charCodeAt(0)));
const strDecompressed = pako.inflate(binData);
const json = JSON.parse(String.fromCharCode.apply(null, strDecompressed));
console.log(json);

function convertPobStringToXML(base64_pob_string) {
  // not url, base64 content itself
  const str = base64_pob_string.replaceAll('-', '+').replaceAll('_','/');
  const strDecoded = atob(str);
  const binData = new Uint8Array(strDecoded.split('').map((x) => x.charCodeAt(0)));
  const strDecompressed = pako.inflate(binData);
  // new Uint16Array(strDecompressed) for utf16
  const xml = String.fromCharCode.apply(null, strDecompressed); 
  return xml;
}

const emptyMat = new cv.Mat(500, 500, 24); // 24 for PNG
cv.imread("path/to/image.png", cv.IMREAD_UNCHANGED).getRegion(new cv.Rect( 555, 555, 555, 555 ));
someImgMat.copyMakeBorder(61, 62, 58, 59, cv.BORDER_CONSTANT); // top bottom left right
someImgMat.copyTo(emptyMat.getRegion(new cv.Rect(0, 0, 300, 300)));
cv.addWeighted(firstImg, 1, secondImg, 1, 0); // img combine
cv.imwrite("path/to/image.png", emptyMat,  [cv.IMWRITE_PNG_COMPRESSION, 0] ); // no png compression

// in case of errors add flag -f FP16 
execSync(`texconv.exe "${ srcFullPath }" -y -ft png -o "${ outputDir }"`); 

// max files.length === 10, max total attachments size < 25MB
const HOOK = new Discord.WebhookClient({ url: 'https://discord.com/api/webhooks/..'});
HOOK.send({ files: [{ attachment: "<path/to/file.txt>", name: "attach_name" }] });