let _isTerminating = false;
let _isTerminatingForce = 5; // Initialize with the maximum number of SIGINTs to force terminate.
process.on('SIGINT', () => {
  if (_isTerminating) {
    if (_isTerminatingForce > 1) {
      --_isTerminatingForce;
      process.stderr.write('\n\n\nGot SIGINT, hit it ' + _isTerminatingForce + ' more times to force terminate.\n\n\n');
    } else {
      process.stderr.write('\n\n\nGot SIGINT, force terminated.\n\n\n');
      process.exit(-1); // eslint-disable-line no-process-exit
    }
  } else {
    process.stderr.write('\n\n\nGot SIGINT, will terminate gracefully. Please wait.\n\n\n');
    _isTerminating = true;
  }
});
// Use `_isTerminating` in the points of async code where termination is not harmful.