How to define entry point for react native app

Question

if you are using Expo, you have to specify the entrypoint in your app.json file like this:

{
  "expo": {
    "entryPoint": "./src/app/index.js"
  }
}

then, inside that file you need to register the app with Expo.registerRootComponent(YOUR_MAIN_APP_COMPONENT)

import Expo from 'expo'
...

class App extends Component {
  ...
}

export default Expo.registerRootComponent(App);

this way you can add your entry file wherever you want.