Function onerror

lib/internal/streams/legacy.js:60–66

(er)

  // Don't leave dangling pipes when there are errors.
  function onerror(er) {
    cleanup();
    // If we removed the last error handler, trigger an unhandled error event.
    if (this.listenerCount?.('error') === 0) {
      this.emit('error', er);
    }
  }

  prependListener(source, 'error', onerror);
  prependListener(dest, 'error', onerror);