The hack for sveltekit specifically, is to first have Claude translate the existing code into a next.js route with react components. Run it, debug and tweak it. Then have Claude translate the next.js and react components into sveltekit/svelte. Try and keep it in a single file for as long as possible and only split it out once it's working.
I've had very good results with Claude Code using this workflow.
I've had very good results with Claude Code using this workflow.