React Native / Xcode Upgrade and now RCTConvert.h not found

Question

App ran fine on React Native 0.35.0. After updating to 0.40.0 via react-native-git-upgrade I get a number of lexical/preprocessor issues when trying to build/ru

Answer 1

If your app isn't to large, just

1) rename original app
2) create the same app again react-native init 
3) copy over all necessary files from your original app to the newly created one
4) adjust the package.json
5) npm install
6) react-native run-

I spent hours to find, where to link the new libraries, it was at least a valuable option and shortcut for me.

hope it helps somebody