The help text to be displayed to the user when --help is passed.
An optional hint for the type of input expected, will be displayed in the help output.
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.
An 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.
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If not specified defaults to the empty string.