Hey, I've deployed a Sveltekit project

Hey, I've deployed a Sveltekit project on Vercel and I'm trying to switch to Cloudflare pages. I've recode some of my functions to run on V8 (like one with Crypto API), and pretty everything is working on pages. But my dev environnement is not working anymore, because of web API. I'm using vite. Is there any way to switch Vite "runtime" to worker ? Or do I have to separate frontend and backend? I've seen that some people do