[svelte-triage-bot]

Fixes #17694

Route declarations and their generated proxies are written directly to their live paths. A reader can open them after truncation but before the new text is written, turning otherwise valid $types imports into error types.

Publish completed text through UUID-named temporary files under outDir, then rename it over the destination. Staging outside types matters: another sync can classify a sibling temporary as a stale route output and delete it before publication. Proxy publication now lives in update_types, alongside declaration publication, using the proxy objects already returned by process_node. The same writer covers the module's metadata output. Failed publication propagates the error and removes the temporary rather than falling back to another truncating write.

This preserves the unconditional-write behavior introduced in #5063, including regeneration timestamps and recreation after cleanup. Switching to write_if_changed would neither provide atomic publication on current main nor preserve those semantics. The final merged #17310 retained disk-content comparison but not atomic publication; #17682 addresses that shared writer separately. Keeping this change local also avoids changing adapter/prerender writer behavior.

#17096 previously staged metadata outside the cleanup tree, but was reverted by #17281 because preserving metadata exposed a cache-invalidation regression. This reuses the safe staging location without restoring metadata preservation or changing invalidation. Stale-file and empty-directory cleanup from #17472 remain intact. The separate root-output deletion issue (#17465) is not addressed here: publication is atomic per file, not a transaction over cleanup and all route outputs.

The scope includes full sync and incremental updates, page and layout declarations, both server and universal proxies, and the adjacent metadata write.

• Reporter setup ported to SvelteLab

[pkg-svelte-dev]

Install the latest version of @sveltejs/kit from 44d2f2e:

pnpm add https://pkg.svelte.dev/@sveltejs/kit/c/44d2f2e9d698ad57ab7289fd0bf3a88bc6d640cb

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/kit/pr/17695

Note

This PR is from a fork. A maintainer must approve approve each commit before it can be built and installed.

[changeset-bot]

🦋 Changeset detected

Latest commit: 44d2f2e

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

This PR includes changesets to release 1 package

Name	Type
@sveltejs/kit	Patch

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