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 false.
The help text to be displayed to the user when --help is passed.
This may be a string, which will be presented directly, or a function, which will be called with an TranslationProxy so that option help can be translated into the user specified locale.