Install the Expo CLI:
$ npm install -g expo-cli
Use the template
$ expo init --template expo-template-scala
$ sbt fastOptJS
Then, launch the app with Expo
$ npm start
To create a minified app, first build an optimized Scala.js bundle
$ sbt fullOptJS
Then, go to
App.js and uncomment
module.exports = require("./target/scala-2.12/app-opt.js").app; in order to enable the production bundle. Finally, switch Expo to production mode to load your production app.
If you need to develop your app without depending on Expo, you can eject at any time by running
npm run eject. This gives you the option to either eject to a "bare" project that uses React Native's build tooling or to an unmanaged ExpoKit project that still uses Expo but lets you add in custom native dependencies.