Ask HN: Functional Reactive Dev tools: what is available?

I'm new to FRP, but what comes up many times even from notorious names and authors is the lack of tooling: eg. specific debugger tailored for FRP to omit jumping back and forth between the FRP framework code and the business logic.

Also, visualisation tools, specific refactor tools might have already been created in the MANY different FRP communities the others are not aware of.

What modern FRP devtools are you aware of? Any dedicated IDEs, plugins, etc. are welcome.