Function isWritableFinished

lib/internal/streams/utils.js:139–149

(stream, strict)

// Have emitted 'finish'.
function isWritableFinished(stream, strict) {
  if (!isWritableNodeStream(stream)) return null;
  if (stream.writableFinished === true) return true;
  const wState = stream._writableState;
  if (wState?.errored) return false;
  if (typeof wState?.finished !== 'boolean') return null;
  return !!(
    wState.finished ||
    (strict === false && wState.ended === true && wState.length === 0)
  );
}

// Have been push(null):d.
function isReadableEnded(stream) {