CF worker with SPA and Chanfana not working

I'm trying SPA with CF worker which has vite-plugin integrated. However, when I'm trying to request an api through wrangler server / vite server I'm getting the following error:

✘ [ERROR] TypeError: Class constructor Test cannot be invoked without 'new'

Also the docs_url, openapi_url and redoc_url were not working.

No files or tests are named. Start by reproducing the failure in the SPA and Cloudflare Worker setup using the vite-plugin and wrangler server, then trace the API request and generated docs URLs. Done means API requests work and docs_url, openapi_url, and redoc_url resolve correctly.

Written by the indexing model from the issue text.