The option name.
The parameter type, used to convert user configuration values into the expected type. If not set, the type will be a string.
Optional configIf set, this option will be omitted from --help, and attempting to specify it on the command
line will produce an error.
Optional defaultIf not specified defaults to undefined.
Optional validateAn optional validation function that validates a potential value of this option. The function must throw an Error if the validation fails and should do nothing otherwise.
The help text to be displayed to the user when --help is passed.