All of those pain points sound terrible. I want to like Reason and Elm so much but it seems like the amount of time you have to spend getting these things to work with other libraries is absurd. Writing JS is not so hard that I would be more productive in a safer language (beside maybe the very pragmatic typescript) if you account for all of the extra time spent trying to interop with other JS libraries or browser APIs.

Elm seemed like it was taking a pragmatic approach with ports but then they got rid of all of the JS interop code in their package manager, forcing everyone to write their own glue code.