Method option

lib/command.js:779–781

* Define option with `flags`, `description`, and optional argument parsing function or `defaultValue` or both. * * The `flags` string contains the short and/or long flags, separated by comma, a pipe or space. A required * option-argument is indicated by `<>` and an optional option-argument

(flags, description, parseArg, defaultValue)

   */

  option(flags, description, parseArg, defaultValue) {
    return this._optionEx({}, flags, description, parseArg, defaultValue);
  }

  /**
   * Add a required option which must have a value after parsing. This usually means