This tool makes upgrading your apps to a new version of React Native easier than the stock react-native upgrade command.
It uses Git under the hood to automatically resolve merge conflicts in project templates (native iOS and Android files, .flowconfig etc.). These conflicts happen when a new React Native version introduces changes to those files and you have local changes in those files too, which is quite common.
See the Upgrading docs on the React Native website.
Basic usage:
$ npm install -g react-native-git-upgrade
$ cd MyReactNativeApp
$ react-native-git-upgrade