constructor(exitCode, code, message) {
    super(message);
    // properly capture stack trace in Node.js
    Error.captureStackTrace(this, this.constructor);
    this.name = this.constructor.name;
    this.code = code;
    this.exitCode = exitCode;
    this.nestedError = undefined;
  }
Constructs the CommanderError class
@param {number} exitCode suggested exit code which could be used with process.exit
@param {string} code an id string representing the error
@param {string} message human-readable description of the error