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.
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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.