Which project does this relate to?

Start

Describe the bug

If I try to use zod 4 in project I get errors when starting vite because router-generator and start-core relies on zod v3 api', the old z.function().returns, its now z.function({input: [], output:[]}).

Your Example Website or App

https://stackblitz.com/edit/github-9eq11eyj?file=package.json

Steps to Reproduce the Bug or Issue

npm install
npm run dev

Expected behavior

Server should start

Screenshots or Videos

Platform

• Router / Start Version: latest
• OS: macos
• Browser: all
• Browser Version: latest
• Bundler: vite
• Bundler Version: vite 7 and 8 beta

Additional context

I guess it's not possible to use zod v4 yet? otherwise get into weird issues where theres multiple versions of zod installed.