type-safe disposal

packages/website/src/hooks/useDispose.ts

@@ -36,9 +36,10 @@ export function useDispose(gltf: GLTF & ObjectMap, path: string) {
             for (const map of maps) {
               if (!map) continue;
 
-              if (typeof map.source.data.close === "function") {
+              if (map.source.data instanceof ImageBitmap) {
                 map.source.data.close();
               }
+
               map.dispose();
             }