> The client-side JavaScript application is developed, built, and tested with many open source libraries including React, Redux, Normalizr, Globalize, Babel, Webpack, Jest, WebdriverIO, and Yarn.

from https://blog.twitter.com/2017/how-we-built-twitter-lite

OP probably assumed React Native was in the list.

Sorry, I added React Native by mistake and was not able to edit my comment later.

I think they used React Native for Web https://github.com/necolas/react-native-web

Wait what. A web framework, adapted to work for native mobile, adapted back to work on the web?

In React Native, you don't have the standard DOM elements since you're not working in a DOM, so it provides some standard elements that get turned into native components (Button, Text, etc). It looks like this is porting those components back to the web. Sounds silly at first, but looks like it can be useful for RN shops.

Its another step to try an unify building apps, and web apps with the same code.

No.. it's PWA.

I believe the author of that module is also one of the main people who worked on the react twitter mobile.