The help text to be displayed to the user when --help is passed.
Maps a given value to the option type. The map type may be a TypeScript enum. In that case, when generating an error message for a mismatched key, the numeric keys will not be listed.
Optional override for the error reported when an invalid key is provided.
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.
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Unlike the rest of the option types, there is no sensible generic default for mapped option types. The default value for a mapped type must be specified.