Is it possible to compile (transpile) Scala to the browser, keeping the ability to interpret Scala code provided dynamically by the user?

I know that Scala.js can transpile to JS, but it doesn't support reflection. Is there any way to interpret user-provided Scala code without recurring to the server side?

If interpreting Scala in this way is not possible, is it possible to run a user-provided JavaScript code from the Scala code (i.e. from that Scala code that will be transpiled)?