Test cases and minor function fixes

package.json

@@ -44,8 +44,10 @@
   "devDependencies": {
     "@changesets/cli": "^2.27.10",
     "@eslint/js": "^9.16.0",
+    "@types/jsdom": "^21.1.7",
     "eslint": "^9.16.0",
     "globals": "^15.13.0",
+    "jsdom": "^25.0.1",
     "typescript": "^5.7.2",
     "typescript-eslint": "^8.17.0",
     "vite": "^6.0.2",