Lightning Network short channel id (CLN) to decimal id (LND) converter

scidConverter.ts

/** By LnRouter.app */
function bitShift(n: number, shiftBy: number): number {
    let base = n;
  for (let i = 0; i < shiftBy; i++) {
      base = base * 2;
  }
  return base;
}

export function shortChannelIdToDecimalId(shortChannelId: string): string {
    const [blockHeightS, transactionIndexS, outputIndexS] = shortChannelId.split("x");
    const blockHeight = Number.parseInt(blockHeightS);
    const transactionIndex = Number.parseInt(transactionIndexS);
    const outputIndex = Number.parseInt(outputIndexS);
    const result = BigInt(bitShift(blockHeight, 40)) | BigInt(bitShift(transactionIndex, 16)) | BigInt(outputIndex);
    return result.toString();
}

const decimalId = shortChannelIdToDecimalId('799046x927x0')
console.log(decimalId) // 878560368188653568