RxSwift convert Observable<Bool> to Observable<Void>

let voidObservable = boolObservable.map { Void() }

let voidObservable = boolObservable.map { _ in Void() }

And in the case that you only want to emit a value if the boolean value is true:

let voidObservable = boolObservable.filter { $0 }.map { _ in Void() }