Method preset

lib/option.js:65–68

* Preset to use when option used without option-argument, especially optional but also boolean and negated. * The custom processing (parseArg) is called. * * @example * new Option('--color').default('GREYSCALE').preset('RGB'); * new Option('--donate [amount]').preset('20').argParser(p

(arg)

   */

  preset(arg) {
    this.presetArg = arg;
    return this;
  }

  /**
   * Add option name(s) that conflict with this option.