How to use the rsocket-core.BufferEncoder.byteLength function in rsocket-core

export function encodeMetadata(
  service: string,
  method: string,
  tracing: Encodable,
  metadata: Encodable,
): Buffer {
  const serviceLength = UTF8Encoder.byteLength(service);
  const methodLength = UTF8Encoder.byteLength(method);
  const metadataLength = BufferEncoder.byteLength(metadata);
  // We can't overload the method call directly and the code generator currently only populates
  // the first 3 parameters
  if (undefined === tracing) {
    tracing = createBuffer(0);
  }
  const tracingLength = BufferEncoder.byteLength(tracing);

  const buffer = createBuffer(
    VERSION_SIZE +
      SERVICE_LENGTH_SIZE +
      serviceLength +
      METHOD_LENGTH_SIZE +
      methodLength +
      TRACING_LENGTH_SIZE +
      tracingLength +
      metadataLength,
  );

  let offset = buffer.writeUInt16BE(VERSION, 0);

  offset = buffer.writeUInt16BE(serviceLength, offset);
  offset = UTF8Encoder.encode(service, buffer, offset, offset + serviceLength);

export function encodeMetadata(
  service: string,
  method: string,
  tracing: Encodable,
  metadata: Encodable,
): Buffer {
  const serviceLength = UTF8Encoder.byteLength(service);
  const methodLength = UTF8Encoder.byteLength(method);
  const metadataLength = BufferEncoder.byteLength(metadata);
  // We can't overload the method call directly and the code generator currently only populates
  // the first 3 parameters
  if (undefined === tracing) {
    tracing = createBuffer(0);
  }
  const tracingLength = BufferEncoder.byteLength(tracing);

  const buffer = createBuffer(
    VERSION_SIZE +
      SERVICE_LENGTH_SIZE +
      serviceLength +
      METHOD_LENGTH_SIZE +
      methodLength +
      TRACING_LENGTH_SIZE +
      tracingLength +
      metadataLength,

export function deserializeTraceData(tracer, metadata) {
  if (!tracer) {
    return null;
  }

  const tracingData = getTracing(metadata);

  if (BufferEncoder.byteLength(tracingData) <= 0) {
    return null;
  }

  return tracer.extract(FORMAT_TEXT_MAP, bufferToMap(tracingData));
}