The index of the occurrence of the option name, or of the first option parameter. It will be NaN if the sequence comes from environment data.
The option name as specified on the command-line, or the environment data source. It will be the preferred name if the sequence comes from positional arguments. It will be the string '0' if the sequence comes from the standard input.
The previously parsed values.
It is an opaque type that should be cast to OptionValues<typeof your_options>
.
Information about the current argument sequence in the parsing loop.