js/main.rkt
#lang s-exp "../lang/js/js.rkt"

(declare-implementation
 #:racket "racket-impl.rkt"
 #:javascript ("js-impl.js")
 #:provided-values (alert
                    body
                    call-method
                    $

                    viewport-width
                    viewport-height
                    in-javascript-context?
                    ))