Modification from https://github.com/hueter/react-native-utility-classes-example
This is an example Expo app containing code you might use to add a Bootstrap- / Tailwind-style utility class API to your app.
The app is very basic and just features a card example using my utility class API. You can use yarn start or yarn ios to lunch it in Expo.
There is a full blog post about this over on at the origina author's website here.