Download the example or clone the repo:
curl https://codeload.github.com/airbnb/react-sketchapp/tar.gz/master | tar -xz --strip=2 react-sketchapp-master/examples/glamorous
cd glamorous
Install the dependencies
npm install
Then, open Sketch and navigate to Plugins → react-sketchapp: glamorous
Run with live reloading in Sketch
npm run render