compiled.js

$.Pb = function(a, b, c, d) {
  return{textures:{}, materials:xf(xg(function(a, b) {
    return new ka(null, 2, [Df, Of.b(Qf.b(b)), Lf, 1 - Tf.b(Qf.b(b))], null);
  }, Sd.a(Ce, Z.a(Pf, Q.a(qd, bf(a)))))), geometries:xf(Q.a(qd, Z.a(function(a) {
    return function g(a) {
      return new V(null, function() {
        for (;;) {
          var b = E(a);
          if (b) {
            if (R(b)) {
              var c = A(b), d = M(c), e = jd(d);
              a: {
                for (var r = 0;;) {
                  if (r < d) {
                    var s = z.a(c, r), t = N.c(s, 0, null), s = N.c(s, 1, null), s = Fc(s) ? Q.a(Dd, s) : s, s = P.a(s, Sf);
                    e.add(new ka(null, 2, [Nf, t, Uf, s], null));
                    r += 1;
                  } else {
                    c = !0;
                    break a;
                  }
                }
                c = void 0;
              }
              return c ? W(X(e), g(D(b))) : W(X(e), null);
            }
            c = F(b);
            e = N.c(c, 0, null);
            c = N.c(c, 1, null);
            c = Fc(c) ? Q.a(Dd, c) : c;
            c = P.a(c, Sf);
            return L(new ka(null, 2, [Nf, e, Uf, c], null), g(G(b)));
          }
          return null;
        }
      }, null, null);
    }(a);
  }, Z.a(Ef, Q.a(qd, bf($.Xb(a, b, c, d)))))))};
};
ba("mylib.core.export_3D", $.Pb);
"undefined" !== typeof module && (wa = function() {
  return null;
}, module.exports = $);
Q.a(wa, Ld.a(2, pg.bc));

})();

src.cljs

(defn ^:export export-3D
  [slices w h t]
  #js {:geometries (clj->js (->>
         (transform-slices slices w h t)
         (vals) (apply concat) (map :geometry)
         (map #(for [[material {:keys [buffer]}] %]
           {:material material
            :data buffer}))
         (apply concat)))
       :materials (clj->js (->> slices vals
         (apply concat) (map :materials)
         (into {}) (map-vals (fn [k v]
           {:color   (-> v :effect :diffuse)
            :opacity (- 1 (-> v :effect :transparency))}))))
       :textures (js-obj)})

(when (exists? js/module)
  (set! *main-cli-fn* (fn [] nil))
  (aset js/module "exports" mylib.core))

user.js

var mylib = require('mylib');

mylib.export_3D(....)
// Possibly unhandled TypeError: mylib.export_3D is not a function