lib/utils.js
function fixStack(stackTrace, error) {
  if (stackTrace) {
    error.stack += '\n  (event loop)\n' + stackTrace.substr(stackTrace.indexOf("\n") + 1);
  }
  return error;
}
function fixStack(stackTrace, error) {
  if (stackTrace) {
    error.stack += '\n  (event loop)\n' + stackTrace.substr(stackTrace.indexOf("\n") + 1);
  }
  return error;
}
Appends the original stack trace to the error after a tick of the event loop