code: function showValidation(feedback) {
    feedback.errors.forEach(function (error) {
      console.log('ERROR: ' + error);
    });
    feedback.warnings.forEach(function (warning) {
      console.log('WARNING: ' + warning);
    });
    console.log("Validator finished with " + feedback.warnings.length + " warnings and " + feedback.errors.length + " errors.");
    process.exit(feedback.errors.length > 0 ? 2 : 0);
  }
docs: Use stdio as an input stream