Return a completable in RxSwift without using a create block

I have a Completable being returned from a simple function. This is not an async call, so I just need to return a succcessful completion or error depending on a conditional (using Rx here so I can tie into other Rx usages):

func exampleFunc() -> Completable {
    if successful {
        return Completable.just() // What to do here???
    } else {
        return Completable.error(SomeErrorType.someError)
    }
}

The error case works pretty easily, but am having a block on how to just return a successful completable (without needing to .create() it).

I was thinking I just need to use Completable's .just() or .never(), but just is requiring a parameter, and never doesn't seem to trigger the completion event.