Demo is not working

[HubbGit]

demo/index.html is not working due to the numerous JS errors
even if I change to

<script **type="module"** src="index.js"></script>

e.g.
index.js:5 Uncaught ReferenceError: require is not defined
at index.js:5:14

index.html:1 Uncaught (in promise) TypeError: Failed to register a ServiceWorker for scope ('https://tst.1st-social.com/html/avif.js/') with script ('https://.../avif.js/avif-sw.js'): ServiceWorker script evaluation failed