By now you should be acquainted to React Native's motto: "Learn once, Write anywhere".
While this is true, it's not always easy to properly setup a project that is ready to target multiple platforms at once.

Amogh Banta is taking on this mission for us, with his ReactNativeEverywhere starter kit.

ReactNativeEverywhere on GitHub

This project is an attempt to:

• Target multiple platforms(Android, iOS, web, windows and macOS) with react native' APIs.
• Follow best practices while doing the above.
• Cut out the time and effort it takes to setup the project(based on create-react-app).
• Achieve 'Write once use everywhere' with react-native(though react strictly says 'Learn once use anywhere').