Summary:
I have been working on integrating React Native into an existing app and realised that the source folder for android code is currently hardcoded as `app`. Being a legacy codebase we can't really change that. So I wanted to be able to customise this folder name so that I can integrate RN seamlessly and start it from the CLI without having to run it from Android Studio.
- Create a barebones RN app
- `react-native run-android` works successfully
- Refactor the name of the app folder inside the android directory to `TestFolderName` using Android Studio
- `react-native run-android` now fails
- Changing this command to `react-native run-android --appFolder=TestFolderName` works successfully
Closes https://github.com/facebook/react-native/pull/13273
Differential Revision: D4833396
Pulled By: ericvicenti
fbshipit-source-id: 4c62cee6aaa2cc78eede5c7756459430022fffde