Nope. Not in any of the several products I've put in production with Elm. There have been times when I've needed more things than Elm provides — one time I need

Nope. Not in any of the several products I've put in production with Elm. There have been times when I've needed more things than Elm provides — one time I needed a library for parsing a streaming JSON response — but the JS interop through ports works just fine.