Combine: ShareReplay - Shares the underlying resource and replays the last emitted value (if there was one) to new subscribers

ShareReplay.swift

extension Publisher {
    func shareReplay() -> AnyPublisher<Output, Failure> {
        let subject = CurrentValueSubject<Output?, Failure>(nil)

        return map { $0 }
            .multicast(subject: subject)
            .autoconnect()
            .compactMap { $0 }
            .eraseToAnyPublisher()
    }
}