npm install -g bs-platform bsb -init my-first-app -theme basic-reason
And then run it as usual:
cd my-first-app npm run build
You can also build in watch mode:
npm run watch
Alternatively, to start a ReasonReact app, try
bsb -init my-react-app -theme react.
More info on bsb & bsconfig here.
BuckleScript has first-class support for Reason, which is why you don't see any extra "reason" installation.