This is the source code from this tutorial.

• $ git clone git@github.com:brunolemos/react-native-web-monorepo.git
• $ cd react-native-web-monorepo
• $ yarn
• $ yarn workspace mobile start
• Run the project
  • Via Xcode / Android Studio
    • Open Xcode / Android Studio and press the Run button
  • Via CLI
    • Open a new terminal tab
    • $ cd packages/mobile
    • $ npm un -g react-native-cli
    • $ npm i -g @react-native-community/cli
    • $ react-native run-ios or react-native run-android

Follow me on Twitter: @brunolemos

Check out DevHub. The main differences are that it shares TypeScript code instead of JavaScript and also supports Desktop in addition to Web, iOS and Android.