alias.type

scratch/main> alias.type ExistingName NewName
scratch/main> alias.type Employee#2jdk10 v1.Employee
scratch/main> alias.type List.map .utils.List.map

alias.type foo bar creates the name bar as an alias for the type foo. Metadata linked to foo is copied over to bar (use unlink if this isn't what you want). foo and bar can be any type names.