Cannot convert return expression of type 'PrimitiveSequence<SingleTrait, String>' to return type 'Observable<String>'

Question

I am getting error Cannot convert return expression of type 'PrimitiveSequence' to return type 'Observable'

a Single returns PrimitiveSequence, so how can I convert it to Observable of type String?

return Single<String>.create(subscribe: { (single) in
    single(.success("test"))            
    return Disposables.create { }
})

What is right way - I have an API which will return String - say Token.

Answer 1

Just tack on .asObservable()...

func foo() -> Observable<String> {
    return Single<String>.create(subscribe: { (single) in
        single(.success("test"))
        return Disposables.create { }
    }).asObservable()
}