Apple has just announced Project Catalyst on WWDC 2019, which allows iOS/iPad apps to run on macOS without modification. This is AWESOME.

We'd love if React Native could build and work correctly on macOS. That should be a supported scenario.

Beta is already available today for developers to test.
EDIT: Stable version of macOS Catalina is already available.

https://techcrunch.com/2019/06/03/ios-apps-will-run-on-macos-with-project-catalyst/