Use the 'asPromise ()' in the Observable RxSwift can be used in a PromiseKit Promise?

I write function 'asPromise()'

but dispose is weird, I don't better idea. so If you have any better ideas, please let me know

thank you

There is no need to capture the disposable at all. When the Observable completes it will automatically dispose of all the resources. Here is the proper implementation:

extension PrimitiveSequence where Trait == SingleTrait { // will only work properly for Singles
    public func asPromise() -> Promise<Element> {
        Promise<Element> { seal in
            _ = subscribe { event in
                switch event {
                case let .success(element):
                    seal.fulfill(element)
                case let .failure(error):
                    seal.reject(error)
                }
            }
        }
    }
}

Did you know that the Combine API already has a Promise like type built in?

extension PrimitiveSequence where Trait == SingleTrait {
    public func asFuture() -> Future<Element, Error> {
        Future { fulfill in
            _ = self.subscribe(fulfill)
        }
    }
}