Macro expansion not visible to code in different file

Using Swift
,
1

Hello,

I recently wrote my first macro that is supposed to expand a given protocol of a data model with a type for a network response. For simplicity lets say that the macro adds a peer struct to the model that conforms to Identifiable and has an additional id property next to the properties the protocol defined. Also an extension with a typealias is added. It would look something like this:

@PublicModel
protocol Person {
    var name: String { get }
    var age: Int { get }
}

And would expand to:

protocol Person {
    var name: String { get }
    var age: Int { get }
}

struct PublicPerson: Codable, Identifiable {
    let id: UUID
    let name: String
    let age: Int

    init(id: UUID, name: String, age: Int) {
        self.id = id
        self.name = name
        self.age = age
    }
}

extension Person {
    typealias Public = PublicPerson
}

Now if I add some code to the file that makes use of the added type and typealias like:

struct AddressBook {
    var people: [Person.Public]
}

let myContacts = AddressBook(people: [
    Person.Public(id: UUID(), name: "Peter", age: 24),
    Person.Public(id: UUID(), name: "Max", age: 25),
    Person.Public(id: UUID(), name: "Lena", age: 23)
])

It compiles just fine.

But as soon as the model definition and usage part are split into separate files I get an error in the usage part that complains that: 'Public' is not a member type of protocol 'Person'.
Is this to be expected?