Swift has a typealias keyword but it's not really useful for this since two distinct aliased types with the same underlying type can be freely interchanged. Wrong code may look wrong but it will still compile.
Wrapper structs are the idiomatic way to achieve this, and with ExpressibleByStringLiteral are pretty ergonomic, but I wonder if there's a case for something like a "strong" typealias ("typecopy"?) that indicates e.g. "this is just a String but it's a particular kind of String and shouldn't be mixed with other Strings".
Wrapper structs are the idiomatic way to achieve this, and with ExpressibleByStringLiteral are pretty ergonomic, but I wonder if there's a case for something like a "strong" typealias ("typecopy"?) that indicates e.g. "this is just a String but it's a particular kind of String and shouldn't be mixed with other Strings".