Should I install babel-preset-flow when using next/babel preset? Or next/babel already handles flow types transformation?
It already handles it.
Please see the with-flow example: https://github.com/zeit/next.js/tree/v3-beta/examples/with-flow
I still had issues with using graphiql, but was able to fix it with this:
https://github.com/ericclemmons/customized-graphiql/blob/master/next.config.js
Is there a reason for _app.js not being typed in the linked example?
Most helpful comment
Updated link: https://github.com/zeit/next.js/tree/canary/examples/with-flow