You can create the instance via the monster namespace new Monster.Types.NodeRecursiveIterator()
.
<script type="module">
import {Monster} from 'https://cdn.jsdelivr.net/npm/@schukai/monster@1.30.0/dist/monster.js';
new Monster.Types.NodeRecursiveIterator()
</script>
Alternatively, you can also integrate this function individually.
<script type="module">
import {NodeRecursiveIterator} from 'https://cdn.jsdelivr.net/npm/@schukai/monster@1.30.0/dist/modules/types/noderecursiveiterator.js';
new NodeRecursiveIterator()
</script>