Function isReadable

lib/internal/streams/utils.js:173–180

(stream)

}

function isReadable(stream) {
  if (stream && stream[kIsReadable] != null) return stream[kIsReadable];
  if (typeof stream?.readable !== 'boolean') return null;
  if (isDestroyed(stream)) return false;
  return isReadableNodeStream(stream) &&
    stream.readable &&
    !isReadableFinished(stream);
}

function isWritable(stream) {
  if (stream && stream[kIsWritable] != null) return stream[kIsWritable];