I was wondering that myself. Here's an Ajax example: https://github.com/purescript-concur/purescript-concur-react...

It could use some type signatures, but it makes sense.

As for managing state, my understanding of the Elm Architecture is that there is one "global" state data structure, and various parts of it are handed down from parent to child. So my question would be the opposite of yours: what if I want local state? Is that possible? There are situations where some toggle being on or off isn't very important and keeping track of it in a global data structure is burdensome