The cool thing is, there's no interop. It's literally JS or Lua. Think of it like CoffeeScript -- there's no "interop" between CoffeeScript and JS. It's just JS.

You can see what each expression compiles to by passing it through (print (compile (expand ...)))

For example:

  > ((require 'leftpad) "foo" 5) 
  "00foo"
  > (print (compile (expand '((require 'leftpad) "foo" 5))))
  require("leftpad")("foo", 5)

And of course, you can use macros to shorten this

  > (define-macro see (x)
      `(print (compile (expand ',x))))
  (macro: function)
  > (fn (x) (+ x 1))
  function
  > (see (fn (x) (+ x 1)))
  function (x) {
    return x + 1;
  }

The best way to learn it is to read test.l and mess around with the expressions while running `make test` to see what breaks.

If you have questions, be sure to reach out or post them here. The maintainer is also quite responsive to opening new issues.