Install symfonyCollectionJs by including a cdn link
cdnjs
<script src="https://cdnjs.cloudflare.com/ajax/libs/symfonyCollectionJs/4.3.1/symfonyCollectionJs.min.js" integrity="sha512-dUYlObeLuqKRYgg0Ujzm79lSc6dcOanSv+MtO2BM2svxSpSN+foESdbi82TZj7ixneAdj7pUoKMmNURVKz52jw==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
jsDelivr
<script src="https://cdn.jsdelivr.net/npm/symfony-collection-js@4.3.1/dist/symfonyCollectionJs.min.js" integrity="sha256-96Lcx06vADOwwjV0CW7BlC92yedSb7898vE2ErDUj38=" crossorigin="anonymous"></script>