Argument is used to define flags in our Command struct.

Flag is used to define flags in our Command struct.

NameVersionValue represents a flag that supports both a name and a version, the following formats are supported: - name - name@version.

PackageValue represents a flag that supports specifying a package in the following formats: - <name> - <namespace>/<name> - <namespace>/<name>@<version>.

PackageValueNoVersion is identical to PackageValue except that it does not support a version.

PackageValueNSRequired is identical to PackageValue except that specifying a namespace is required.

UserValue represents a flag that supports both a name and an email address, the following formats are supported: - name <email> - email Emails are detected simply by containing a @ symbol.

PackagesValue is used to represent multiple PackageValue, this is used when a flag can be passed multiple times.

UsersValue is used to represent multiple UserValue, this is used when a flag can be passed multiple times.