Too Long; Didn't Read
The Facebook React Native project team chose Flow vs TypeScript for our React Native app almost three years ago. TypeScript has a lot of value to offer making the switch highly attractive. The project team decided to use Flow vs. TypeScript instead of VSCode for their next React project. We used Flow to create a Flow-to-typescript and Babel to convert our configuration from Flow to TypeScript in Babel 7. We also used Babel support for TypeScript with a JavaScript + Flow extension with a.js extension to Type.js.