Upgrade checklists / Product releases
Vite 8.3.5 Upgrade Checklist: Chunk Maps, Assets & CSS
Published October 31, 2026 · Source-linked checklist
This checklist assumes you already use the Vite 8.3 branch. It is not a migration guide from Vite 6 or 7. Review major-version requirements separately if you are crossing those boundaries.
Changes worth checking
The 8.3.5 notes cover missing chunk import maps, preload dependencies in chunk-map hashing, bundled development asset origins and handling literal percent characters in CSS URLs. They also list development environment and HMR fixes.
Suggested validation
- Preserve the lockfile, then use
npm install --save-dev --save-exact [email protected]. Check runtime and plugin compatibility for your project. - Run a production build and navigate routes that load dynamic chunks. If you enable chunk import maps, compare output and check for missing imports.
- With server.origin configured, inspect generated development asset URLs. Test a stylesheet containing a literal percent URL if that pattern occurs in your application.
- Change an imported module and confirm HMR behaviour using your actual plugin stack.
Suggested checks have not been executed on your project. A patch label and absence of a source flag do not prove compatibility. Retain the prior artifact for rollback.