fix: reset sveltekit-controlled error boundaries on navigation - #16296
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This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to version-3, this PR will be updated.⚠️ ⚠️ ⚠️ ⚠️ ⚠️ ⚠️ `version-3` is currently in **pre mode** so this branch has prereleases rather than normal releases. If you want to exit prereleases, run `changeset pre exit` on `version-3`.⚠️ ⚠️ ⚠️ ⚠️ ⚠️ ⚠️ # Releases ## @sveltejs/kit@3.0.0-next.8 ### Major Changes - breaking: remove `experimental.handleRenderingErrors` flag ([#16265](#16265)) - breaking: make `getRequest` and `setResponse` synchronous ([#16280](#16280)) - breaking: make `page.url` immutable on a type level ([#16256](#16256)) - breaking: add `refreshAll` and deprecate `invalidateAll` ([#16289](#16289)) ### Minor Changes - feat: allow hyphens in param and matcher names ([#16284](#16284)) - feat: add `ErrorProps` to generated types ([#16272](#16272)) ### Patch Changes - fix: detect destructured `load` and `actions` exports during type generation ([#16329](#16329)) - fix: ensure CSS URL references are absolute when `paths.relative` is `false` ([#16315](#16315)) - fix: exclude deleted cookies from `cookies.getAll()` so it stays consistent with `cookies.get()` ([#16297](#16297)) - fix: reset failed `<svelte:boundary>` on client navigation so a stale `+error.svelte` is torn down ([#16296](#16296)) - fix: preserve shared client chunk hashes when the app version changes ([#16324](#16324)) - fix: align MAX_COOKIE_SIZE with RFC 6265bis ([#16322](#16322)) - fix: use mouseover+mousemove for preloading to reduce events ([#16325](#16325)) ## @sveltejs/package@3.0.0-next.2 ### Minor Changes - feat: warn when using a `.server.` file or file inside a `server` directory without importing a server-only module ([#16266](#16266)) ## @sveltejs/adapter-auto@8.0.0-next.1 ### Patch Changes - fix: allow prerelease versions of SvelteKit 3 to satisfy the peer dependency range ([#16286](#16286)) - Updated dependencies [[`737d119`](737d119), [`fa78efb`](fa78efb), [`07c207e`](07c207e), [`a47071b`](a47071b), [`14d7d5a`](14d7d5a), [`5c38e51`](5c38e51), [`0702baa`](0702baa), [`e1938c6`](e1938c6), [`8293144`](8293144), [`f76d7d9`](f76d7d9), [`ab5c253`](ab5c253), [`b557b1b`](b557b1b), [`4a513e2`](4a513e2)]: - @sveltejs/kit@3.0.0-next.8 ## @sveltejs/adapter-cloudflare@8.0.0-next.2 ### Patch Changes - fix: allow prerelease versions of SvelteKit 3 to satisfy the peer dependency range ([#16286](#16286)) - Updated dependencies [[`737d119`](737d119), [`fa78efb`](fa78efb), [`07c207e`](07c207e), [`a47071b`](a47071b), [`14d7d5a`](14d7d5a), [`5c38e51`](5c38e51), [`0702baa`](0702baa), [`e1938c6`](e1938c6), [`8293144`](8293144), [`f76d7d9`](f76d7d9), [`ab5c253`](ab5c253), [`b557b1b`](b557b1b), [`4a513e2`](4a513e2)]: - @sveltejs/kit@3.0.0-next.8 ## @sveltejs/adapter-netlify@7.0.0-next.3 ### Patch Changes - fix: include `utils.js` in package.json `files` ([#16298](#16298)) - Updated dependencies [[`737d119`](737d119), [`fa78efb`](fa78efb), [`07c207e`](07c207e), [`a47071b`](a47071b), [`14d7d5a`](14d7d5a), [`5c38e51`](5c38e51), [`0702baa`](0702baa), [`e1938c6`](e1938c6), [`8293144`](8293144), [`f76d7d9`](f76d7d9), [`ab5c253`](ab5c253), [`b557b1b`](b557b1b), [`4a513e2`](4a513e2)]: - @sveltejs/kit@3.0.0-next.8 ## @sveltejs/adapter-node@6.0.0-next.3 ### Patch Changes - fix: allow prerelease versions of SvelteKit 3 to satisfy the peer dependency range ([#16286](#16286)) - Updated dependencies [[`737d119`](737d119), [`fa78efb`](fa78efb), [`07c207e`](07c207e), [`a47071b`](a47071b), [`14d7d5a`](14d7d5a), [`5c38e51`](5c38e51), [`0702baa`](0702baa), [`e1938c6`](e1938c6), [`8293144`](8293144), [`f76d7d9`](f76d7d9), [`ab5c253`](ab5c253), [`b557b1b`](b557b1b), [`4a513e2`](4a513e2)]: - @sveltejs/kit@3.0.0-next.8 ## @sveltejs/adapter-static@4.0.0-next.1 ### Patch Changes - fix: allow prerelease versions of SvelteKit 3 to satisfy the peer dependency range ([#16286](#16286)) - Updated dependencies [[`737d119`](737d119), [`fa78efb`](fa78efb), [`07c207e`](07c207e), [`a47071b`](a47071b), [`14d7d5a`](14d7d5a), [`5c38e51`](5c38e51), [`0702baa`](0702baa), [`e1938c6`](e1938c6), [`8293144`](8293144), [`f76d7d9`](f76d7d9), [`ab5c253`](ab5c253), [`b557b1b`](b557b1b), [`4a513e2`](4a513e2)]: - @sveltejs/kit@3.0.0-next.8 ## @sveltejs/adapter-vercel@7.0.0-next.2 ### Patch Changes - fix: allow prerelease versions of SvelteKit 3 to satisfy the peer dependency range ([#16286](#16286)) - Updated dependencies [[`737d119`](737d119), [`fa78efb`](fa78efb), [`07c207e`](07c207e), [`a47071b`](a47071b), [`14d7d5a`](14d7d5a), [`5c38e51`](5c38e51), [`0702baa`](0702baa), [`e1938c6`](e1938c6), [`8293144`](8293144), [`f76d7d9`](f76d7d9), [`ab5c253`](ab5c253), [`b557b1b`](b557b1b), [`4a513e2`](4a513e2)]: - @sveltejs/kit@3.0.0-next.8 Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Rich-Harris
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Aug 13, 2026
…n error is thrown during rendering (#16526) Fixes the error page placement half of #16345. Since #16301, an error thrown while rendering is caught by the boundary at the depth that threw it, so the nearest `+error.svelte` renders inside every layout between its own directory and the throwing component. The same error thrown in `load` renders that component at its own depth with the intervening layouts unmounted. Before #16301 the generated root only armed a boundary at depths that own an error component (`failed={errors[depth] ? failed : undefined}`), which made render errors rethrow up to the owning depth. The unconditional boundary plus the nearest-ancestor `findLast` changed that without a changeset, first shipping in 3.0.0-next.8, the version #16345 was filed against. SvelteKit 2 places the same error at the owning depth. The client and the server now build that array with one shared function instead of a copy each. Nearest-boundary selection (#14410, #15745) is unchanged, only where the selected error page renders. `set_nearest_error_page` rebuilt the chain with no errors at all, so a render error inside a form error page fell back to the root one. It now passes the route's. Conditional arming exposed a latent ordering problem in the #16296 reset path: `navigate` drains the resetters as soon as the new props are applied, before the flush, so a stale failed boundary re-renders its old content (which throws again) at a depth the new tree may no longer have. Unconditionally armed boundaries silently re-swallowed that throw on every teardown; with sparse arming it escaped to an ancestor boundary and rendered an error page instead of the new route. The drain now runs after `settled()`, matching the fork branch, which resets after state is applied. Boundaries at removed depths are simply unmounted by the flush; boundaries at surviving depths reset against a consistent tree. The async test app's `/server-error-boundary` route already had exactly this shape, with the root error page silently rendering inside the section layout. The two existing tests now assert the layout is gone. --------- Co-authored-by: Rich Harris <richard.a.harris@gmail.com> Co-authored-by: Rich Harris <rich.harris@vercel.com>
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Closes #15694
Keeps track of error boundaries' reset functions that SvelteKit controls, resetting them on navigate.