fix: support exactOptionalPropertyTypes for optional route params#15825
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elliott-with-the-longest-name-on-github merged 3 commits intoMay 22, 2026
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🦋 Changeset detectedLatest commit: 7bc99ce 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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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 main, this PR will be updated. # Releases ## @sveltejs/kit@2.61.0 ### Minor Changes - breaking: the `.run()` method has been removed from remote queries on both the client and the server. Use `await query()` directly instead — it now works everywhere ([#15779](#15779)) - feat: remote queries can now be awaited in any context (event handlers, module scope, async callbacks), not just inside reactive contexts. The cache is shared across reactive and non-reactive subscribers, so awaiting a query in an event handler will dedupe with components that have already subscribed to the same query. ([#15779](#15779)) - feat: live query instances are now themselves async-iterable ([#15878](#15878)) - feat: add programmatic `submit` method to `form` remote function instances ([#15657](#15657)) - feat: pass `form` remote function instance into `enhance` callback ([#15657](#15657)) ### Patch Changes - fix: resolve the app payload without using `process.env.NODE_ENV` ([#15852](#15852)) - fix: support `exactOptionalPropertyTypes` for optional route params ([#15825](#15825)) - fix: correctly send `true` value to the server for 'submit' and 'hidden' form fields ([#15858](#15858)) - fix: avoid build warnings about undefined universal hooks ([#15895](#15895)) - fix: prefer default error page when failing to decode the URL pathname ([#15744](#15744)) - fix: disable link prefetching on slow internet connections ([#15885](#15885)) - fix: allow routes ending with optional parameters next to more specific routes ([#15861](#15861)) - fix: remove reliance on Content-Length header in deserialize_binary_form, which caused failures when proxies (e.g. Vercel, Azure) strip the header and use chunked transfer encoding ([#15796](#15796)) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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Closes #15453
Updates generated route parameter types so optional params are emitted as
?: T | undefinedin both route-local$typesand$app/types, which makes them compatible with TypeScript’sexactOptionalPropertyTypessetting without changing existing matcher constraints.Please don't delete this checklist! Before submitting the PR, please make sure you do the following:
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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