Vite hardens dev shutdowns, SSR traces, and optimizer flow

Dev server and optimizer shutdown got more robust

Vite fixed several edge cases where closing the dev server or dep optimizer could leave background work hanging or accidentally re-activate watchers. Late watcher.add() calls after shutdown no longer reinitialize the watcher, and optimizer teardown now clears pending work so queued dep processing can resolve cleanly.

SSR debugging and sourcemaps are more reliable

SSR-evaluated modules now encode sourceURL values safely, which fixes stack traces and source-map lookup for paths containing spaces. Sourcemap injection also skips external URLs and remote sources, preventing Vite from trying to treat remote files like local ones.

Import scanning and config merging caught correctness bugs

The optimizer scan regex was tightened so imports whose names start with type are no longer misread as TypeScript type-only imports, avoiding missed dependencies during pre-bundling. Vite also hardened mergeConfig so server.hmr merges no longer crash when server.ws is explicitly disabled.

create-vite template routing was clarified

TanStack Start was split out from TanStack Router in create-vite, with new Start entries for React and Solid and router-only commands now passing --router-only. This should make the starter selection match user intent more closely.

Other misc changes

• Rolldown dev runtime now serves from the installed package, reducing path/layout assumptions
• Forwarded console payloads are capped and object pretty-printing is more constrained
• create-vite switched from cross-spawn to tinyexec in a few paths
• Docs clarified defaults like server.sourcemapIgnoreList and preserveEntrySignatures
• ViteConf 2026 site/banner updates and v8.3.1 release housekeeping
• Small refactors, test updates, CI tweaks, dependency bumps, and typo fixes