Continuation.swift

enum SomeError: Error {
   case foo
}

func completionFunction(completion: @escaping ([Data], error: @escaping (Error) -> Void) -> Void) {
   getData(complete: completion)
}

func asyncFunctionWrapper() async -> Data {
    await withCheckedThrowingContinuation { continuation in
        completionFunction(completion: { data in
            continuation.resume(returning: data)
        } error: {
           contiuation.resume(throwing: SomeError.foo)
        })
    }
}