* Array subclass encapsulating common operations on `process.argv`. * @static

* @alias module:argv-parser

* @alias module:option-definitions

* Encapsulates behaviour (defined by an OptionDefinition) when setting values

* Describes a command-line option. Additionally, if generating a usage guide with [command-line-usage](https://github.com/75lb/command-line-usage) you

* A map of { DefinitionNameString: Option }. By default, an Output has an `_unknown` property and any options with defaultValues.