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fix: various declaration tag bugs#18348

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fix-18334-declaration-tag-bugs
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fix: various declaration tag bugs#18348
dummdidumm merged 1 commit into
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fix-18334-declaration-tag-bugs

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@Rich-Harris

@Rich-Harris Rich-Harris commented May 31, 2026

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closes #18334

Before submitting the PR, please make sure you do the following

  • It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
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  • This message body should clearly illustrate what problems it solves.
  • Ideally, include a test that fails without this PR but passes with it.
  • If this PR changes code within packages/svelte/src, add a changeset (npx changeset).

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  • Run the tests with pnpm test and lint the project with pnpm lint

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🦋 Changeset detected

Latest commit: 7381e69

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

This PR includes changesets to release 1 package
Name Type
svelte Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

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pnpm add https://pkg.pr.new/svelte@18348

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Preview: https://svelte-dev-git-preview-svelte-18348-svelte.vercel.app/

@dummdidumm dummdidumm merged commit b76b937 into main Jun 1, 2026
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@dummdidumm dummdidumm deleted the fix-18334-declaration-tag-bugs branch June 1, 2026 07:59
@github-actions github-actions Bot mentioned this pull request May 31, 2026
Merged
Rich-Harris pushed a commit that referenced this pull request Jun 1, 2026
@github-actions
Version Packages (#18346)
3ef761b 
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
## svelte@5.56.1

### Patch Changes

- fix: error at compile time on duplicate snippet/declaration tag
definitions ([#18351](#18351))

- fix: parse declaration tag contents more robustly
([#18353](#18353))

- fix: correctly transform references to earlier declarators in a
declaration tag (e.g. `{let a = $state(0), b = $derived(a * 2)}`)
([#18348](#18348))

- fix: avoid spurious `state_referenced_locally` warnings for `$derived`
declarations in declaration tags
([#18348](#18348))

- fix: tolerate whitespace before `let`/`const` in declaration tags
([#18348](#18348))

- fix: prevent infinite loop when a tag's expression ends with a
trailing `/` at the end of the input
([#18350](#18350))

- fix: more robust parsing of declaration tags with regards to `type`
([#18330](#18330))

- fix: preserve newlines in spread input values when the `type`
attribute is applied after `value`
([#18345](#18345))

- fix: update `SvelteURLSearchParams` when setting duplicate keys to the
same joined value
([#18336](#18336))

- fix: check references for blockers on server, too
([#18352](#18352))

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
@github-actions github-actions Bot mentioned this pull request Jun 2, 2026
Closed
huskas-2189 added a commit to huskas-2189/Bookmark that referenced this pull request Jun 14, 2026
@huskas-2189
chore(deps): update dependency svelte to v5.56.1 (#82)
6f6fb22 
This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [svelte](https://svelte.dev) ([source](https://github.com/sveltejs/svelte/tree/HEAD/packages/svelte)) | [`5.56.0` → `5.56.1`](https://renovatebot.com/diffs/npm/svelte/5.56.0/5.56.1) | ![age](https://developer.mend.io/api/mc/badges/age/npm/svelte/5.56.1?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/svelte/5.56.0/5.56.1?slim=true) |

---

### Release Notes

<details>
<summary>sveltejs/svelte (svelte)</summary>

### [`v5.56.1`](https://github.com/sveltejs/svelte/blob/HEAD/packages/svelte/CHANGELOG.md#5561)

[Compare Source](https://github.com/sveltejs/svelte/compare/svelte@5.56.0...svelte@5.56.1)

##### Patch Changes

- fix: error at compile time on duplicate snippet/declaration tag definitions ([#&#8203;18351](sveltejs/svelte#18351))

- fix: parse declaration tag contents more robustly ([#&#8203;18353](sveltejs/svelte#18353))

- fix: correctly transform references to earlier declarators in a declaration tag (e.g. `{let a = $state(0), b = $derived(a * 2)}`) ([#&#8203;18348](sveltejs/svelte#18348))

- fix: avoid spurious `state_referenced_locally` warnings for `$derived` declarations in declaration tags ([#&#8203;18348](sveltejs/svelte#18348))

- fix: tolerate whitespace before `let`/`const` in declaration tags ([#&#8203;18348](sveltejs/svelte#18348))

- fix: prevent infinite loop when a tag's expression ends with a trailing `/` at the end of the input ([#&#8203;18350](sveltejs/svelte#18350))

- fix: more robust parsing of declaration tags with regards to `type` ([#&#8203;18330](sveltejs/svelte#18330))

- fix: preserve newlines in spread input values when the `type` attribute is applied after `value` ([#&#8203;18345](sveltejs/svelte#18345))

- fix: update `SvelteURLSearchParams` when setting duplicate keys to the same joined value ([#&#8203;18336](sveltejs/svelte#18336))

- fix: check references for blockers on server, too ([#&#8203;18352](sveltejs/svelte#18352))

</details>

---

### Configuration

📅 **Schedule**: (UTC)

- Branch creation
  - At any time (no schedule defined)
- Automerge
  - At any time (no schedule defined)

🚦 **Automerge**: Disabled because a matching PR was automerged previously.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4xOTUuMCIsInVwZGF0ZWRJblZlciI6IjQzLjE5NS4wIiwidGFyZ2V0QnJhbmNoIjoiZGV2ZWxvcCIsImxhYmVscyI6W119-->

Co-authored-by: huskas-2189 <huskas-2189@noreply.codeberg.org>
Reviewed-on: https://codeberg.org/huskas-2189/Bookmark/pulls/82
huskas-2189 added a commit to huskas-2189/Bookmark that referenced this pull request Jun 19, 2026
@huskas-2189
chore(deps): update dependency svelte to v5.56.1 (#82)
88b4a04 
This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [svelte](https://svelte.dev) ([source](https://github.com/sveltejs/svelte/tree/HEAD/packages/svelte)) | [`5.56.0` → `5.56.1`](https://renovatebot.com/diffs/npm/svelte/5.56.0/5.56.1) | ![age](https://developer.mend.io/api/mc/badges/age/npm/svelte/5.56.1?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/svelte/5.56.0/5.56.1?slim=true) |

---

### Release Notes

<details>
<summary>sveltejs/svelte (svelte)</summary>

### [`v5.56.1`](https://github.com/sveltejs/svelte/blob/HEAD/packages/svelte/CHANGELOG.md#5561)

[Compare Source](https://github.com/sveltejs/svelte/compare/svelte@5.56.0...svelte@5.56.1)

##### Patch Changes

- fix: error at compile time on duplicate snippet/declaration tag definitions ([#&#8203;18351](sveltejs/svelte#18351))

- fix: parse declaration tag contents more robustly ([#&#8203;18353](sveltejs/svelte#18353))

- fix: correctly transform references to earlier declarators in a declaration tag (e.g. `{let a = $state(0), b = $derived(a * 2)}`) ([#&#8203;18348](sveltejs/svelte#18348))

- fix: avoid spurious `state_referenced_locally` warnings for `$derived` declarations in declaration tags ([#&#8203;18348](sveltejs/svelte#18348))

- fix: tolerate whitespace before `let`/`const` in declaration tags ([#&#8203;18348](sveltejs/svelte#18348))

- fix: prevent infinite loop when a tag's expression ends with a trailing `/` at the end of the input ([#&#8203;18350](sveltejs/svelte#18350))

- fix: more robust parsing of declaration tags with regards to `type` ([#&#8203;18330](sveltejs/svelte#18330))

- fix: preserve newlines in spread input values when the `type` attribute is applied after `value` ([#&#8203;18345](sveltejs/svelte#18345))

- fix: update `SvelteURLSearchParams` when setting duplicate keys to the same joined value ([#&#8203;18336](sveltejs/svelte#18336))

- fix: check references for blockers on server, too ([#&#8203;18352](sveltejs/svelte#18352))

</details>

---

### Configuration

📅 **Schedule**: (UTC)

- Branch creation
  - At any time (no schedule defined)
- Automerge
  - At any time (no schedule defined)

🚦 **Automerge**: Disabled because a matching PR was automerged previously.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4xOTUuMCIsInVwZGF0ZWRJblZlciI6IjQzLjE5NS4wIiwidGFyZ2V0QnJhbmNoIjoiZGV2ZWxvcCIsImxhYmVscyI6W119-->

Co-authored-by: huskas-2189 <huskas-2189@noreply.codeberg.org>
Reviewed-on: https://codeberg.org/huskas-2189/Bookmark/pulls/82
huskas-2189 added a commit to huskas-2189/Bookmark that referenced this pull request Jun 19, 2026
@huskas-2189
chore(deps): update dependency svelte to v5.56.1 (#82)
aa91e42 
This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [svelte](https://svelte.dev) ([source](https://github.com/sveltejs/svelte/tree/HEAD/packages/svelte)) | [`5.56.0` → `5.56.1`](https://renovatebot.com/diffs/npm/svelte/5.56.0/5.56.1) | ![age](https://developer.mend.io/api/mc/badges/age/npm/svelte/5.56.1?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/svelte/5.56.0/5.56.1?slim=true) |

---

### Release Notes

<details>
<summary>sveltejs/svelte (svelte)</summary>

### [`v5.56.1`](https://github.com/sveltejs/svelte/blob/HEAD/packages/svelte/CHANGELOG.md#5561)

[Compare Source](https://github.com/sveltejs/svelte/compare/svelte@5.56.0...svelte@5.56.1)

##### Patch Changes

- fix: error at compile time on duplicate snippet/declaration tag definitions ([#&#8203;18351](sveltejs/svelte#18351))

- fix: parse declaration tag contents more robustly ([#&#8203;18353](sveltejs/svelte#18353))

- fix: correctly transform references to earlier declarators in a declaration tag (e.g. `{let a = $state(0), b = $derived(a * 2)}`) ([#&#8203;18348](sveltejs/svelte#18348))

- fix: avoid spurious `state_referenced_locally` warnings for `$derived` declarations in declaration tags ([#&#8203;18348](sveltejs/svelte#18348))

- fix: tolerate whitespace before `let`/`const` in declaration tags ([#&#8203;18348](sveltejs/svelte#18348))

- fix: prevent infinite loop when a tag's expression ends with a trailing `/` at the end of the input ([#&#8203;18350](sveltejs/svelte#18350))

- fix: more robust parsing of declaration tags with regards to `type` ([#&#8203;18330](sveltejs/svelte#18330))

- fix: preserve newlines in spread input values when the `type` attribute is applied after `value` ([#&#8203;18345](sveltejs/svelte#18345))

- fix: update `SvelteURLSearchParams` when setting duplicate keys to the same joined value ([#&#8203;18336](sveltejs/svelte#18336))

- fix: check references for blockers on server, too ([#&#8203;18352](sveltejs/svelte#18352))

</details>

---

### Configuration

📅 **Schedule**: (UTC)

- Branch creation
  - At any time (no schedule defined)
- Automerge
  - At any time (no schedule defined)

🚦 **Automerge**: Disabled because a matching PR was automerged previously.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4xOTUuMCIsInVwZGF0ZWRJblZlciI6IjQzLjE5NS4wIiwidGFyZ2V0QnJhbmNoIjoiZGV2ZWxvcCIsImxhYmVscyI6W119-->

Co-authored-by: huskas-2189 <huskas-2189@noreply.codeberg.org>
Reviewed-on: https://codeberg.org/huskas-2189/Bookmark/pulls/82
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Declaration tag bugs

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@Rich-Harris @dummdidumm