Function isClosed

lib/internal/streams/utils.js:235–259

(stream)

}

function isClosed(stream) {
  if (!isNodeStream(stream)) {
    return null;
  }

  if (typeof stream.closed === 'boolean') {
    return stream.closed;
  }

  const wState = stream._writableState;
  const rState = stream._readableState;

  if (
    typeof wState?.closed === 'boolean' ||
    typeof rState?.closed === 'boolean'
  ) {
    return wState?.closed || rState?.closed;
  }

  if (typeof stream._closed === 'boolean' && isOutgoingMessage(stream)) {
    return stream._closed;
  }

  return null;
}

function isOutgoingMessage(stream) {
  return (