how to export a prefix to an ref object type? (JSFFI)

[Niminem]

I think I came up with a hack.. it works but idk if it's the best way of doing 
things:

wrapper: 
    
    
    from dom import Node
    
    type
        Scene* = ref object
        Camera* = ref object of RootObj
        PerspectiveCamera* = ref object of Camera
            fov*,far*{.importc.}: cint
            aspect*, near* {.importc.}: cfloat
        WebGLRenderer* = ref object
            domElement*{.importc.}: Node
    
    proc newScene*(): Scene {.importc: "new THREE.Scene".}
    proc newCamera*(fov: cint, aspect, near: cfloat, far: cint): 
PerspectiveCamera {.importc: "new THREE.PerspectiveCamera".}
    proc newWebGLRenderer*(): WebGLRenderer {.importc: "new 
THREE.WebGLREnderer".}
    
    
    Run

mainjs.nim 
    
    
    import threejs
    
    var scene {.exportc.} = newScene()
    var camera {.exportc.} = newCamera(75, window.innerWidth / 
window.innerHeight, 0.1, 1000)
    var renderer {.exportc.} = newWebGLRenderer()
    
    
    Run

output(js) 
    
    
    var scene = new THREE.Scene();
    var camera = new THREE.PerspectiveCamera(75, 
HEX2F_1555648(window.innerWidth, window.innerHeight), 1.0000000000000001e-01, 
1000);
    var renderer = new THREE.WebGLRenderer();
    
    
    Run