Internal_InternalOptionalextraAttrs: any[]Register a custom CLI option. Call this in your subclass constructor before invoking Options#parse.
the long option name (without --)
the option definition
Build the help text from all registered option definitions.
Parse the command-line arguments. Populates Options#values, Options#positionals, Options#stdin, Options#options, and Options#failureLevel.
the process arguments (typically process.argv)
Parses command-line arguments and builds Asciidoctor convert options. Extend this class to add custom options via Options#addOption.