docs: clarify which hooks run during server route resolution#16397
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Rich-Harris merged 2 commits intoJul 18, 2026
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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/[email protected] ### Major Changes - breaking: `config` exported from a universal route file takes precedence over a server one ([#16400](#16400)) - breaking: consistent special filename patterns ([#16382](#16382)) ### Minor Changes - feat: support sourcemaps in production ([#16412](#16412)) - feat: support function validators for environment variables ([#16402](#16402)) - feat: better error logging ([#16374](#16374)) ### Patch Changes - fix: don't treat callable standard schemas as function param matchers ([#16403](#16403)) - fix: reject malformed streamed data encoding ([#16423](#16423)) - fix: hide stack traces for internal errors like 404s ([#16411](#16411)) - perf: match only unpaired surrogates when escaping HTML ([#16407](#16407)) - fix: don't report empty environment variables as missing ([#16401](#16401)) - chore: clarify which hooks run during server route resolution ([#16397](#16397)) ## @sveltejs/[email protected] ### Minor Changes - feat: better error logging ([#16374](#16374)) ### Patch Changes - Updated dependencies [[`5220191`](5220191), [`8cb2f7d`](8cb2f7d), [`b88c7a7`](b88c7a7), [`a6ea113`](a6ea113), [`6446f64`](6446f64), [`58f1789`](58f1789), [`09774a2`](09774a2), [`c542fdd`](c542fdd), [`aedaa27`](aedaa27), [`428ee1a`](428ee1a), [`fefb3ae`](fefb3ae)]: - @sveltejs/[email protected] Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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closes #14896
The
router.resolutiondocs say the server "has an opportunity to intercept each navigation (for example through a middleware)". #14896 read that as "thehandlehook runs", which it does not. Route resolution requests are answered as soon as the route has been looked up (respond.js#L323-L324), beforehandleis invoked and afterreroutehas run (respond.js#L249). Verified empirically in dev and in preview after a production build, details in #14896 (comment). The wording dates to #13379, which introduced server-side route resolution.The new sentence is scoped to the route lookup rather than stating a blanket "handle never runs", because there is one path where it does. A pathname that fails to decode falls through to normal request handling (respond.js#L272-L277), deliberate behavior from #15744 so that malformed URLs render the default error page. In production
GET /%c0/__route.jstherefore reacheshandlewith pathname/%c0before being rejected with a 400. Dev masks this because the dev middleware rejects malformed URIs earlier, which #15744 also notes.Two changes to the option's JSDoc. "Middleware" now says what it refers to, and a sentence states which hooks run for resolution requests.
types/index.d.tsregenerated.Note on sequencing, #16396 also touches
public.d.ts(different lines) and regeneratestypes/index.d.ts; whichever merges second needs a trivial rebase and regeneration.Please don't delete this checklist! Before submitting the PR, please make sure you do the following:
Tests
pnpm testand lint the project withpnpm lintandpnpm checkChangesets
pnpm changesetand following the prompts. Changesets that add features should beminorand those that fix bugs should bepatch. Please prefix changeset messages withfeat:,fix:, orchore:.Edits