It is a react native setup boilerplate that doesn't use Objective-C for IOS and Java for Android instead it is using Swift for IOS and Kotlin for Android.
git clone https://github.com/mountainfirefly/react-native-kotlin-swift-boilerplate.git
cd react-native-kotlin-swift-boilerplate/
yarn install
For IOS
npx react-native run-ios
For Android
npx react-native run-android