Diagnosing a vapor JS issue

Hi all, I've had to do a hack job on an application to demo a different UI. The application normally works in Vapor so it's not teething issues. Everything work in locally. In the Vue component I pull in serveral JS files like below:

import queueHandle from './queue-handle'
import touchEvent from './touch-event'

I've adjusted my vite.config.js to build those files.

I can see the files being included in Chrome's network tab and the UI for one cycle but then stops.

There's no Console errors, alerts or any sign of why it is failing. I thought it might have been those imported files but can't see any issues.

Any ideas how to start debugging this?

Thanks, RobJ.