three demo

import
    dom, jsffi

var THREE {.importc, nodecl.}: JsObject
var document {.importc, nodecl.}: JsObject
var window {.importc, nodecl.}: JsObject

proc render() =
    requestAnimationFrame(render)     <===  Error: proc requestAnimationFrame(w: Window; function: proc (time: float)): int
    cube.rotation.x += 0.01           <== Error: type mismatch: got <JsObject, float64>
render()