Function enhanceStackTrace

lib/events.js:424–447

(err, own)

};

function enhanceStackTrace(err, own) {
  let ctorInfo = '';
  try {
    const { name } = this.constructor;
    if (name !== 'EventEmitter')
      ctorInfo = ` on ${name} instance`;
  } catch {
    // Continue regardless of error.
  }
  const sep = `\nEmitted 'error' event${ctorInfo} at:\n`;

  const errStack = ArrayPrototypeSlice(
    StringPrototypeSplit(err.stack, '\n'), 1);
  const ownStack = ArrayPrototypeSlice(
    StringPrototypeSplit(own.stack, '\n'), 1);

  const { len, offset } = identicalSequenceRange(ownStack, errStack);
  if (len > 0) {
    ArrayPrototypeSplice(ownStack, offset + 1, len - 2,
                         '    [... lines matching original stack trace ...]');
  }

  return err.stack + sep + ArrayPrototypeJoin(ownStack, '\n');
}

/**
 * Synchronously calls each of the listeners registered