@sveltejs/kit@2.66.0

sveltejs/kit@sveltejs/kit@2.66.0Jun 18, 2026by github-actions[bot]

AI Summary

Enhances performance by precompressing markdown files and improves developer experience with form schema warnings, alongside numerous navigation and caching fixes.

Key Highlights

Precompresses prerendered `.md` and `.mdx` files for better performance.
Warns users when boolean inputs are not made optional in form schemas.
Fixes navigation blur/focusout handlers and `query.live` reconnect behavior.
Supports `ws:`/`wss:` and `trusted-types-eval` for CSP sources.

New Features

Precompression for `.md` and `.mdx` files.
Warning for optional boolean inputs in form schemas.

Full Release Notes

### Minor Changes


- feat: precompress prerendered `.md` and `.mdx` files ([#15893](https://github.com/sveltejs/kit/pull/15893))


- feat: warn the user when they forget to make boolean inputs optional in their form schemas ([#15804](https://github.com/sveltejs/kit/pull/15804))


### Patch Changes


- fix: blur active element before component update during navigation so that blur/focusout handlers fire while old component data is still valid ([#15452](https://github.com/sveltejs/kit/pull/15452))


- fix: ensure `base` is available from `$service-worker` during development ([#15882](https://github.com/sveltejs/kit/pull/15882))


- fix: use correct relative asset paths when rendering an error page for a missing `__data.json` request ([#15884](https://github.com/sveltejs/kit/pull/15884))


- fix: preserve active `for await` consumers across `query.live` reconnects ([#16022](https://github.com/sveltejs/kit/pull/16022))


- fix: settle `query.live` reconnect promise on all exit paths, preventing `invalidateAll()` from deadlocking when a live query is offline or interrupted ([#16022](https://github.com/sveltejs/kit/pull/16022))


- fix: preserve last value when a `query.live` stream completes without yielding on reconnect ([#16022](https://github.com/sveltejs/kit/pull/16022))


- fix: remove `types: ['node']` from generated tsconfig to avoid errors when `@types/node` is not installed ([#15709](https://github.com/sveltejs/kit/pull/15709))


- fix: prefer pages over endpoints when prerendering ([#16076](https://github.com/sveltejs/kit/pull/16076))


- fix: restore snapshots after afterNavigate callbacks ([#16066](https://github.com/sveltejs/kit/pull/16066))


- fix: support `ws:`/`wss:` and `trusted-types-eval` for CSP sources ([#15938](https://github.com/sveltejs/kit/pull/15938))


- fix: omit empty `file` inputs from remote form data ([#15898](https://github.com/sveltejs/kit/pull/15898))


- fix: fail early if a route with `+page` and `+server` is marked as prerenderable ([#16075](https://github.com/sveltejs/kit/pull/16075))


- fix: wait a tick before resetting forms ([#15805](https://github.com/sveltejs/kit/pull/15805))


- fix: `preflight` schemas apply correctly when chained before `for` ([#15863](https://github.com/sveltejs/kit/pull/15863))


- fix: blank page in SPA mode when root layout `load()` throws ([#15798](https://github.com/sveltejs/kit/pull/15798))


- fix: pass all unknown options from the `sveltekit` Vite plugin through to `vite-plugin-svelte` ([#16010](https://github.com/sveltejs/kit/pull/16010))