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Here's an example with The Elm Architecture [1]

A long discussion about using it[2]

And a react example[3]

Worth noting that ReasonReact is made by the same person who made React. The whole Reason effort is, actually.

I personally work on it too and have been using it on messenger.com

Reason -> Bucklescript is definitely very productive with a modern JS framework.

Facebook has started rewriting several things internally with Reason, including Messenger (which uses React, I believe).