breaking: remove `handleValidationError`, pass validation errors to `handleError` by elliott-with-the-longest-name-on-github · Pull Request #16672 · sveltejs/kit

elliott-with-the-longest-name-on-github · 2026-08-06T21:29:37Z

Basically what the title says. Instead of two hooks, the new design of handleError allows us to centralize this.

pkg-svelte-dev · 2026-08-06T21:29:40Z

Install the latest version of @sveltejs/kit from 8b5cf83:

pnpm add https://pkg.svelte.dev/@sveltejs/kit/c/8b5cf8390ae3235adda44a9947655d0fd3440030

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/kit/pr/16672

changeset-bot · 2026-08-06T21:29:47Z

🦋 Changeset detected

Latest commit: 8b5cf83

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	Major

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svelte-docs-bot · 2026-08-06T23:14:38Z

Preview: https://svelte-dev-git-preview-kit-16672-svelte.vercel.app/

Rich-Harris · 2026-08-08T00:52:49Z

-	/**
-	 * The event before `derive_remote_function_event` hid or stubbed properties.
-	 * Hooks like `handleValidationError` receive this so `url` etc. stay accessible
-	 */
-	readonly original_event?: RequestEvent;


…16694) First slice of #16676. Follow-ups in this stack: `@sveltejs/kit/params`, the `$app/server` types, and hooks types once #16664/#16672 settle. --------- Co-authored-by: Rich Harris <richard.a.harris@gmail.com> Co-authored-by: Rich Harris <rich.harris@vercel.com>

`handleError`

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`. ⚠️

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⚠️ # Releases ## @sveltejs/kit@3.0.0-next.19 ### Major Changes - breaking: move `defineParams` and associated types to `@sveltejs/kit/params` ([#16716](#16716)) - breaking: run all errors through the `handleError` hook ([#16664](#16664)) - breaking: move `Page`, `ReadonlyURL` and `ReadonlyURLSearchParams` from `@sveltejs/kit` to `$app/state` ([#16694](#16694)) - breaking: move `BeforeNavigate`, `OnNavigate`, `AfterNavigate`, `Navigation`, `NavigationTarget`, `NavigationType`, `GotoOptions` and the `Navigation*` variant types from `@sveltejs/kit` to `$app/navigation` ([#16694](#16694)) - breaking: move `ActionResult` and `SubmitFunction` from `@sveltejs/kit` to `$app/forms` ([#16694](#16694)) - breaking: remove `handleValidationError` and pass remote function validation errors to `handleError` with `kind: 'validation'` ([#16672](#16672)) ### Minor Changes - feat: ignore files with + prefix if they contain test/spec/stories ([#16715](#16715)) ### Patch Changes - fix: rebuild the dev manifest when route files disappear during an incremental update ([#16643](#16643)) - fix: externalize `@opentelemetry/api` to prevent bundler chunk colocation between `instrumentation.server.js` and application code ([#16302](#16302)) - fix: surface prerender errors during development ([#16507](#16507)) ## @sveltejs/adapter-node@6.0.0-next.9 ### Patch Changes - fix: externalize `@opentelemetry/api` to prevent bundler chunk colocation between `instrumentation.server.js` and application code ([#16302](#16302)) - Updated dependencies [[`04f9ab4`](04f9ab4), [`1e198bd`](1e198bd), [`813726d`](813726d), [`a115a7b`](a115a7b), [`031ac69`](031ac69), [`dc7442c`](dc7442c), [`19c4478`](19c4478), [`dc7442c`](dc7442c), [`dc7442c`](dc7442c), [`0b3e2b3`](0b3e2b3)]: - @sveltejs/kit@3.0.0-next.19 Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: Tee Ming <chewteeming01@gmail.com>

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.19 ### Major Changes - breaking: move `defineParams` and associated types to `@sveltejs/kit/params` ([#16716](#16716)) - breaking: run all errors through the `handleError` hook ([#16664](#16664)) - breaking: move `Page`, `ReadonlyURL` and `ReadonlyURLSearchParams` from `@sveltejs/kit` to `$app/state` ([#16694](#16694)) - breaking: move `BeforeNavigate`, `OnNavigate`, `AfterNavigate`, `Navigation`, `NavigationTarget`, `NavigationType`, `GotoOptions` and the `Navigation*` variant types from `@sveltejs/kit` to `$app/navigation` ([#16694](#16694)) - breaking: move `ActionResult` and `SubmitFunction` from `@sveltejs/kit` to `$app/forms` ([#16694](#16694)) - breaking: remove `handleValidationError` and pass remote function validation errors to `handleError` with `kind: 'validation'` ([#16672](#16672)) ### Minor Changes - feat: ignore files with + prefix if they contain test/spec/stories ([#16715](#16715)) ### Patch Changes - fix: rebuild the dev manifest when route files disappear during an incremental update ([#16643](#16643)) - fix: externalize `@opentelemetry/api` to prevent bundler chunk colocation between `instrumentation.server.js` and application code ([#16302](#16302)) - fix: surface prerender errors during development ([#16507](#16507)) - fix: adjust error overload for optional `App.Error` parameters ([#16725](#16725)) ## @sveltejs/adapter-node@6.0.0-next.9 ### Patch Changes - fix: externalize `@opentelemetry/api` to prevent bundler chunk colocation between `instrumentation.server.js` and application code ([#16302](#16302)) - Updated dependencies [[`04f9ab4`](04f9ab4), [`1e198bd`](1e198bd), [`813726d`](813726d), [`a115a7b`](a115a7b), [`031ac69`](031ac69), [`dc7442c`](dc7442c), [`19c4478`](19c4478), [`dc7442c`](dc7442c), [`dc7442c`](dc7442c), [`0b3e2b3`](0b3e2b3), [`c5d0ce2`](c5d0ce2)]: - @sveltejs/kit@3.0.0-next.19 Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

elliott-with-the-longest-name-on-github force-pushed the elliott/handle-validation-errors branch from b2da04e to 58519fe Compare August 6, 2026 21:47

elliott-with-the-longest-name-on-github force-pushed the elliott/handle-validation-errors branch 3 times, most recently from 6e99c64 to 4cc21e8 Compare August 7, 2026 17:37

Rich-Harris reviewed Aug 8, 2026

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Comment thread documentation/docs/20-core-concepts/60-remote-functions.md Outdated

Rich-Harris reviewed Aug 8, 2026

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Nic-Polumeyv mentioned this pull request Aug 8, 2026

breaking: move navigation, form and page types to their $app modules #16694

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elliott-with-the-longest-name-on-github force-pushed the elliott/handle-validation-errors branch from 4cc21e8 to 0fd046a Compare August 10, 2026 17:58

Rich-Harris approved these changes Aug 10, 2026

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elliott-with-the-longest-name-on-github force-pushed the elliott/handle-validation-errors branch from 0fd046a to 2360d56 Compare August 10, 2026 19:16

elliott-with-the-longest-name-on-github force-pushed the elliott/handle-validation-errors branch from 2360d56 to 4b5dbb2 Compare August 10, 2026 19:22

Rich-Harris force-pushed the elliott/handle-validation-errors branch from 4b5dbb2 to 9e03360 Compare August 10, 2026 20:50

elliott-with-the-longest-name-on-github added needs-ecosystem-ci This PR needs to have an ecosystem CI run started prior to its last commit before merging. and removed needs-ecosystem-ci This PR needs to have an ecosystem CI run started prior to its last commit before merging. labels Aug 10, 2026

breaking: remove handleValidationError, pass validation errors to

8b5cf83

`handleError`

elliott-with-the-longest-name-on-github force-pushed the elliott/handle-validation-errors branch from 9e03360 to 8b5cf83 Compare August 10, 2026 21:06

elliott-with-the-longest-name-on-github merged commit 0b3e2b3 into version-3 Aug 10, 2026
26 of 27 checks passed

elliott-with-the-longest-name-on-github deleted the elliott/handle-validation-errors branch August 10, 2026 21:32

github-actions Bot mentioned this pull request Aug 10, 2026

Version Packages (next) #16714

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github-actions Bot mentioned this pull request Aug 11, 2026

Version Packages (next) #16732

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breaking: remove `handleValidationError`, pass validation errors to `handleError` - #16672

breaking: remove `handleValidationError`, pass validation errors to `handleError`#16672
elliott-with-the-longest-name-on-github merged 1 commit into
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