My React Native apps folder structure looks like
/android
/ios
/app
/components
/containers
/images
/modules
/stores
/styles
/config
index.android.js
index.ios.js
app/components - All my own components are in this directory
app/containers - All my pages are in this directory
app/images - All images
app/modules - All my native modules are in this directory
app/stores - I'm using MobX for State Management. So, I add all the MobX stores in this directory
app/styles - All the styles are in this directory
app/config - All my configurations like database credentials, API base url, dev mode etc., are in this directory