Swift 5.1 で OpenCombine https://github.com/broadwaylamb/OpenCombine をインポート出来るようにしました。 @swift-5.1.5

import OpenCombine let publisher = Just(28) _ = publisher .map { number in return "Antoine's age is \(number)" } .sink { (value) in print(value) }

(edited)

Open-source implementation of Apple's Combine framework for processing values over time. - broadwaylamb/OpenCombine