Download the example or clone the repo:

curl https://codeload.github.com/zeit/next.js/tar.gz/master | tar -xz --strip=2 next.js-master/examples/with-flow
cd with-flow

Install it and run:

npm install
npm run dev

Deploy it to the cloud with now (download)

now

This example shows how you can use Flow, with the transform-flow-strip-types babel plugin stripping flow type annotations from your output code.