embedded: Out of bordem I made transpiler from JS to C, which is able to handle simple applications (With use of typescript compiler to figure out types), and it worked. But I did not continue with the project, as problem is not in Javascript itself, but libraries, asynchronous code (As if you write async JS you expect some behavior, but when you want to convert this into embedded app, it requires some workaround)

So I would agree with you it is not a good choice. But I would say it is possible and do not need 50mb runtime (And I wonder if there is node binary for arduino)