export function toBase64Url(input: Buffer): string {
  return input.toString("base64").replace(/\+/g, "-").replace(/\//g, "_").replace(/=+$/g, "");
}

export function fromBase64Url(input: string): Buffer {
  const padded = input.replace(/-/g, "+").replace(/_/g, "/");
  const padLength = (4 - (padded.length % 4)) % 4;
  const base64 = padded + "=".repeat(padLength);
  return Buffer.from(base64, "base64");
}