Const Warning produced by the parser when a deprecated option is specified on the command-line.
Raised by the parser when either a niladic option or a positional marker is specified with an inline parameter.
Raised by the validator when there are two identical cluster letters.
Raised by the validator when either an enumeration constraint or the truth and falsity names have duplicate values.
Raised by the validator when there are two identical option names.
Raised by the validator when there are two or more positional options.
Raised by the validator when either an enumeration constraint or the truth and falsity names have zero length.
Raised by the validator when a positional option has an empty positional marker.
Raised by both the parser and validator when a value fails to satisfy either an enumeration constraint or the truth and falsity names.
Raised by the validator when an option uses a value of incompatible data type in a requirement.
Raised by the validator when an option has an invalid cluster letter.
Raised by the parser when either a variadic option or a command option is specified in the middle of a cluster argument.
Raised by the validator when a variadic option declares an inline constraint.
Raised by the validator when a number-valued option has an invalid numeric range.
Raised by the validator when an option has an invalid name.
Raised by the validator when a function option has an invalid parameter count.
Raised by the validator when an option references either a non-valued or an unknown-valued option in a requirement.
Raised by the validator when an option uses a nullish value in a requirement referencing an option that is either always required or has a default value.
Raised by the validator when an option references itself in a requirement.
Raised by the validator when a version option has an empty version string.
Raised by both the parser and validator when a value fails to satisfy an array limit constraint.
Raised by the parser when an option is specified without an inline parameter, despite it being required.
Raised by the parser when it fails to find a "package.json" file when resolving the version.
Raised by the parser when an option parameter is expected but was not specified.
Raised by the parser when an option that is always required was not specified.
Warning produced by the validator when a name slot contains names with different naming conventions.
Raised by both the parser and validator when a value fails to satisfy a number range constraint.
Raised by both the parser and validator when a value fails to satisfy a string regex constraint.
Warning produced by the validator when an option name is too similar to other names.
Raised by the parser when an option name is not found, with possible option name suggestions.
Raised by the validator when an option references an unknown option in a requirement.
Raised by the validator when a non-positional option has no name.
Raised by the parser when an option's conditional requirement is not satisfied.
Raised by the parser when an option requirement is not satisfied.
Warning produced by the validator when a variadic option declares cluster letters.
The kind of items that can be thrown as error messages.