Hello Eileen!
I’m sure you won’t be disappointed with ReScript 
Out of curiosity, what’s your perspective on Gleam? I have never tried it, but the language itself looks similar to ReScript, F#, and others from the “practical FP” family. At the same time it can compile to JS. Gleam has its roots in the BEAM world and given you’re using Elixir already, Gleam sounds like a natural choice. However you came to ReScript. I wonder why?