Microsoft is rewriting react-native-windows from C# to C++. It's very active and they keep up-to-date with the upstream RN fork. After the rewrite it will be

Microsoft is rewriting react-native-windows from C# to C++. It's very active and they keep up-to-date with the upstream RN fork. After the rewrite it will be merged into react-native. There's work already done there. Catalyst opens up the doors for react-native to work on MacOS without many changes.