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fix: reset sveltekit-controlled error boundaries on navigation - #16296

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Closes #15694

Keeps track of error boundaries' reset functions that SvelteKit controls, resetting them on navigate.

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Install the latest version of @sveltejs/kit from cd48bc7:

pnpm add https://pkg.svelte.dev/@sveltejs/kit/c/cd48bc7cf470f8f5f037263802236c2a70cbe193

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/kit/pr/16296

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🦋 Changeset detected

Latest commit: cd48bc7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package
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@sveltejs/kit Patch

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@Rich-Harris
Rich-Harris merged commit f76d7d9 into version-3 Jul 10, 2026
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@Rich-Harris
Rich-Harris deleted the elliott/double-mount-error branch July 10, 2026 15:07
Rich-Harris pushed a commit that referenced this pull request Jul 14, 2026
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 added a commit that referenced this pull request 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>
Arutemu64 added a commit to Arutemu64/fanapp that referenced this pull request Oct 8, 2026
…#874)

* build(frontend): migrate to sveltekit 3 and precache without vite-pwa

Upgrades @sveltejs/kit 2.70.3 -> 3.0.0, adapter-static 3 -> 4,
enhanced-img 0.11 -> 1.0 and svelte 5.57.0 -> 5.57.1 (Kit 3's floor),
following https://svelte.dev/docs/kit/migrating-to-sveltekit-3. The
`sv migrate sveltekit-3` codemod did the mechanical part; its printer
also reflowed markup (moving text and punctuation across lines, which
changes rendered whitespace), so every touched file was regenerated
from main with a specifier-only codemod and only the semantic edits
were re-applied.

Framework changes:
- svelte.config.js is gone; its options are passed to sveltekit() in
  vite.config.ts. experimental.handleRenderingErrors is now default.
- $lib -> #lib subpath imports (package.json "imports"), with explicit
  extensions; components.json points the shadcn CLI at #lib (verified
  it emits #lib/utils.js).
- $env/static/public -> $app/env/public, declared in src/env.ts.
  PUBLIC_SMARTCAPTCHA_CLIENT_KEY and PUBLIC_SITE_URL were missing from
  the codemod's list.
- Path literals drop the leading slash ('' for home): route IDs now
  carry groups, so '/profile' is neither an ID nor a valid pathname.
  Every place that compares a Path with url.pathname now resolves it
  first (TAB_ROOTS, isNavItemActive, the back-transition target, the
  nav bars' re-tap-to-top check).
- pushState -> goto('', { shallow: true }). Kit 3 runs navigation
  hooks for shallow goto, so the (app) layout skips them there.
- invalidateAll -> refreshAll, which keeps page.state across the
  reconnect refresh. replaceState/keepFocus -> replace/reset.
- goto now rejects for paths that match no route: completeLogin falls
  back to home when the ?next= path is bogus.
- handleError gets { kind, error } and now sees expected errors too:
  app errors keep their thrown body, framework errors (unmatched route)
  get the Russian copy instead of Kit's English "Not Found", and only
  unknown errors are reported.
- ErrorState's reload-on-navigate workaround and its TODO are removed:
  Kit 3 resets failed boundaries itself (sveltejs/kit#16296).
- Removed comments: the handleRenderingErrors note in svelte.config.js
  and the +error.svelte mentions of the flag (the flag no longer
  exists), and the frontend.md bullet describing the Kit 2 boundary
  bug (its workaround is gone).

Service worker (ADR-0020, superseding ADR-0016's plugin choice):
@vite-pwa/sveltekit 1.1.0 peers only on Kit <= 2 and ships no precache
manifest under Kit 3 (support is an open, unreviewed PR,
vite-pwa/sveltekit#111). The worker now builds its Workbox precache
list from $app/manifest via a pure, unit-tested buildPrecacheManifest
with the old globPatterns/globIgnores rules. Verified in Chromium
against a Kit 2 build of main served like nginx: the same entries
(plus Kit 3's new payload chunk), no excluded file leaks, install,
control and offline deep links work. The worker moves to
src/service-worker/ with its own tsconfig (typechecked by pnpm check,
now type-linted too, which caught an unawaited skipWaiting()) and is
registered as a module worker, as Kit 3 emits it (Firefox 147+, Chrome
91+, Safari 15+; older browsers degrade to online-only).

Tooling: eslint reads the config through @sveltejs/load-config and
drops its function-valued `typescript` key for --cache; perfectionist
groups #lib as internal imports; knip learns src/env.ts.

pnpm-workspace.yaml exempts the exact versions kit@3.0.0,
adapter-static@4.0.0 and enhanced-img@1.0.0 from the 7-day cooldown.
All three were published 2026-10-01 ~17:22 UTC, so they mature a few
hours after this commit. The TODO there says to drop the exemption.

Suggested version bump: PATCH (a dependency migration; `just deploy`
alone is enough, with no new env var or manual step).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FGCtDhZVRh8Udfx6UwtW3E

* fix(frontend): convert backend notification paths to app paths explicitly

The API sends root-relative deep links ("/schedule", "/" for home).
Passed to resolve() as-is, they hit its route-ID branch, which happens
to produce the same pathname for today's paths but would parse
[params] and (groups) in one. toAppPath strips the leading slash so
resolve() reads them as pathnames; the notification card and the toast
action both use it. Tests cover the paths the backend's notification
interactors actually send. Also drops the stale "cast to Pathname"
comment.

Raised by Greptile on #874.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FGCtDhZVRh8Udfx6UwtW3E

* test(frontend): run the e2e build without captcha and sentry, trim the zoom check

Three e2e failures that main shares, fixed here so this PR can go green:

- CI builds with the real PUBLIC_SMARTCAPTCHA_CLIENT_KEY repository
  variable. The Yandex widget refuses 127.0.0.1 and blocks the email
  step, failing the 12 login specs from #872 on every run.
- It also builds with the real PUBLIC_SENTRY_DSN at a 0.1 trace rate, so
  about one navigation in ten posts a performance trace to the DSN's
  /api/<project>/envelope/ path, which the API mock's **/api/** route
  records as unmatched (seen on the WebKit broadcast spec; confirmed
  locally to be transactions, not error reports).
- The map zoom spec tapped «Масштаб» right after the viewer appeared and
  asserted PhotoSwipe's pswp--zoomed-in class; the opening animation
  resets an early tap (1/40 on main, 3/40 here). Zooming is the
  library's job, so the spec now checks only that the single-pointer
  control is there.

playwright.config.ts blanks the two keys in webServer.env (Playwright
merges it over process.env, and real env vars beat the .env file). The
gallery config inherits it. Also fixes a comment there that still
pointed at vite-pwa's devOptions.

Verified: all 135 specs on mobile-chromium, desktop-chromium and
mobile-webkit with a captcha key, a DSN and trace rate 1.0 set, no
retries; the map spec 80/80 across two projects.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FGCtDhZVRh8Udfx6UwtW3E

* chore(frontend): flag the number-input check for svelte 5.57.2

Svelte 5.57.2 fixes a spread overwriting an unchanged `value`, which can
wipe a half-typed number. The shared Input spreads its props next to
bind:value, so the settings and ticket-generator number fields may be
affected. 5.57.2 is still inside the 7-day pnpm cooldown until
2026-10-13, so this leaves a TODO to verify the fields once Renovate
brings it in.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FGCtDhZVRh8Udfx6UwtW3E

---------

Co-authored-by: Claude <noreply@anthropic.com>
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Client navigation leaves stale +error.svelte mounted after remote query render error with experimental handleRenderingErrors

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