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fix: svelte missing expression crash#10140

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ematipico merged 7 commits into
biomejs:mainfrom
solithcy:fix/svelte-expression-crash
Apr 28, 2026
Merged

fix: svelte missing expression crash#10140
ematipico merged 7 commits into
biomejs:mainfrom
solithcy:fix/svelte-expression-crash

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@solithcy

@solithcy solithcy commented Apr 27, 2026

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Summary

Fixes a crash when a Svelte block keyword has no expression. Fixes #10135 and addresses #10003 further.

Test Plan

Added snapshot tests. Other snapshots have been mutated slightly as a caret now shows where the error occurs for missing expressions.

@changeset-bot

changeset-bot Bot commented Apr 27, 2026

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🦋 Changeset detected

Latest commit: ad1edac

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

This PR includes changesets to release 13 packages
Name Type
@biomejs/biome Patch
@biomejs/cli-win32-x64 Patch
@biomejs/cli-win32-arm64 Patch
@biomejs/cli-darwin-x64 Patch
@biomejs/cli-darwin-arm64 Patch
@biomejs/cli-linux-x64 Patch
@biomejs/cli-linux-arm64 Patch
@biomejs/cli-linux-x64-musl Patch
@biomejs/cli-linux-arm64-musl Patch
@biomejs/wasm-web Patch
@biomejs/wasm-bundler Patch
@biomejs/wasm-nodejs Patch
@biomejs/backend-jsonrpc 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

@github-actions github-actions Bot added A-Parser Area: parser L-HTML Language: HTML and super languages labels Apr 27, 2026
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Walkthrough

Adds a changeset for a patch release and updates the HTML parser to avoid panics when Svelte template expressions are missing. The text-expression parser now distinguishes EOF/</} (returns Absent), truly empty text tokens (remapped to HTML_LITERAL and Absent), and whitespace-only text (treated as trivia via skip_as_trivia() then Absent). The Svelte snippet-opening parser no longer performs an explicit empty-expression remap/diagnostic. New tests exercise missing-expression cases for {#if}, {:else if}, {@const} and {#snippet}.

Suggested reviewers

  • ematipico
  • dyc3
🚥 Pre-merge checks | ✅ 4
✅ Passed checks (4 passed)
Check name Status Explanation
Title check ✅ Passed The title 'fix: svelte missing expression crash' clearly and concisely summarises the main change—preventing crashes when Svelte block keywords lack expressions.
Description check ✅ Passed The description directly relates to the changeset, explaining the crash fix, referencing linked issues #10135 and #10003, and outlining the test approach with snapshot updates.
Linked Issues check ✅ Passed The PR adequately addresses #10135 by fixing crashes when Svelte directives like {@const} and {#if} lack expressions, handling incomplete syntax gracefully without panicking.
Out of Scope Changes check ✅ Passed All changes are directly within scope: parser fixes for missing expressions, test fixtures for error cases, and test snapshots—no unrelated modifications detected.

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Comment thread .changeset/fix-svelte-missing-expression-crashes.md Outdated
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@codspeed-hq

codspeed-hq Bot commented Apr 27, 2026

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Merging this PR will not alter performance

✅ 67 untouched benchmarks
⏩ 189 skipped benchmarks1


Comparing solithcy:fix/svelte-expression-crash (ad1edac) with main (46a77d0)

Open in CodSpeed

Footnotes

  1. 189 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports.

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Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)
crates/biome_html_parser/src/syntax/svelte.rs (1)

89-108: ⚠️ Potential issue | 🟠 Major

The whitespace-only cases {#if } and {#snippet } are still broken—this fix is incomplete.

The snapshot for if_missing_expression.svelte confirms the issue: {#if } produces a malformed AST with missing closing brace and the space becoming content, paired with the diagnostic "expected } but instead found ". The root cause is clear: parse_single_text_expression_content returns Absent without bumping when it sees whitespace-only input, but neither parse_if_opening_block nor parse_snippet_opening_block handles this unconsumed token afterwards. (By comparison, parse_const_block at line 923 correctly checks trim().is_empty() post-call and bumps if needed.)

Before merging, either:

  1. Have parse_single_text_expression_content always bump on whitespace-only (symmetric with the empty case), or
  2. Add post-call whitespace-only checks in both parse_if_opening_block and parse_snippet_opening_block, as the learning from PR #8509 requires for callers.

Currently missing test coverage: {#snippet } (whitespace-only).

🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@crates/biome_html_parser/src/syntax/svelte.rs` around lines 89 - 108, The fix
must ensure whitespace-only expressions are consumed so the trailing space isn't
treated as content: either make parse_single_text_expression_content always bump
the whitespace-only token (symmetric with the empty-case behavior) or, in
parse_if_opening_block and parse_snippet_opening_block, after calling
parse_single_text_expression_content().or_add_diagnostic(...), check the parsed
text (like parse_const_block does with trim().is_empty()) and bump the pending
whitespace token if it was whitespace-only before expecting the closing T!['}'];
update the diagnostic handling path to still call expected_expression and then
consume the whitespace to avoid malformed ASTs (add a test for `{`#snippet` }`
similarly to if_missing_expression.svelte).
🧹 Nitpick comments (1)
crates/biome_html_parser/src/syntax/svelte.rs (1)

134-137: Optional: hoist the trivia-eating pattern into a tiny helper.

The same three-line incantation now appears in parse_else_if_clause, parse_opening_block, and parse_const_block. A small private helper would keep future openers from drifting and make the intent self-documenting.

♻️ Sketch
/// Consumes a leftover whitespace-only `HTML_LITERAL` as trivia so the
/// closing `}` can be matched cleanly when the expression is missing.
#[inline]
fn skip_whitespace_literal(p: &mut HtmlParser) {
    if p.at(HTML_LITERAL) && p.cur_text().trim().is_empty() {
        p.source_mut().skip_as_trivia();
    }
}

Then each call site shrinks to skip_whitespace_literal(p);.

Also applies to: 804-807, 923-926

🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@crates/biome_html_parser/src/syntax/svelte.rs` around lines 134 - 137,
Extract the repeated three-line pattern that consumes a whitespace-only
HTML_LITERAL into a tiny private helper, e.g. fn skip_whitespace_literal(p: &mut
HtmlParser) { if p.at(HTML_LITERAL) && p.cur_text().trim().is_empty() {
p.source_mut().skip_as_trivia(); } }, mark it #[inline], and replace the
occurrences in parse_else_if_clause, parse_opening_block, and parse_const_block
(and the other duplicated spots around the mentioned locations) with a single
call skip_whitespace_literal(p); to make intent clear and avoid duplication.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.

Outside diff comments:
In `@crates/biome_html_parser/src/syntax/svelte.rs`:
- Around line 89-108: The fix must ensure whitespace-only expressions are
consumed so the trailing space isn't treated as content: either make
parse_single_text_expression_content always bump the whitespace-only token
(symmetric with the empty-case behavior) or, in parse_if_opening_block and
parse_snippet_opening_block, after calling
parse_single_text_expression_content().or_add_diagnostic(...), check the parsed
text (like parse_const_block does with trim().is_empty()) and bump the pending
whitespace token if it was whitespace-only before expecting the closing T!['}'];
update the diagnostic handling path to still call expected_expression and then
consume the whitespace to avoid malformed ASTs (add a test for `{`#snippet` }`
similarly to if_missing_expression.svelte).

---

Nitpick comments:
In `@crates/biome_html_parser/src/syntax/svelte.rs`:
- Around line 134-137: Extract the repeated three-line pattern that consumes a
whitespace-only HTML_LITERAL into a tiny private helper, e.g. fn
skip_whitespace_literal(p: &mut HtmlParser) { if p.at(HTML_LITERAL) &&
p.cur_text().trim().is_empty() { p.source_mut().skip_as_trivia(); } }, mark it
#[inline], and replace the occurrences in parse_else_if_clause,
parse_opening_block, and parse_const_block (and the other duplicated spots
around the mentioned locations) with a single call skip_whitespace_literal(p);
to make intent clear and avoid duplication.

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📥 Commits

Reviewing files that changed from the base of the PR and between dbcbb79 and e44241f.

📒 Files selected for processing (1)
  • crates/biome_html_parser/src/syntax/svelte.rs

0: AS_KW@7..10 "as" [] [Whitespace(" ")]
2: (empty)
3: SVELTE_EACH_AS_KEYED_ITEM@6..14
0: AS_KW@6..10 "as" [Skipped(" ")] [Whitespace(" ")]

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This is wrong. Skipped trivia are particular, and their use in this case is incorrect. Can you revert or change the consumption of the token?

@solithcy solithcy Apr 27, 2026

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Regarding this, it feels to me like the easiest way to go about this, allowing for parsing } as a token when missing an expression, would be changing

fn consume_single_text_expression(&mut self) -> HtmlSyntaxKind {

to consume whitespace. This way the leading space is removed from all expressions, making it easier to handle missing expressions.

I've fiddled around with this locally, it would look like:

unrelated test case affected by change - correct if block

           opening_block: SvelteIfOpeningBlock {
                sv_curly_hash_token: SV_CURLY_HASH@0..2 "{#" [] [],
-               if_token: IF_KW@2..4 "if" [] [],
+               if_token: IF_KW@2..5 "if" [] [Whitespace(" ")],
                expression: HtmlTextExpression {
-                   html_literal_token: HTML_LITERAL@4..18 " answer === 42" [] [],
+                   html_literal_token: HTML_LITERAL@5..18 "answer === 42" [] [],
                },
                r_curly_token: R_CURLY@18..19 "}" [] [],

related test case fixed by change - if block missing expression

-       HtmlBogusElement {
-           items: [
-               HtmlBogus {
-                   items: [
-                       SV_CURLY_HASH@0..2 "{#" [] [],
-                       IF_KW@2..4 "if" [] [],
-                       HTML_LITERAL@4..4 "" [] [],
-                       R_CURLY@4..5 "}" [] [],
-                       HtmlElementList [
+       SvelteIfBlock {
+           opening_block: SvelteIfOpeningBlock {
+               sv_curly_hash_token: SV_CURLY_HASH@0..2 "{#" [] [],
+               if_token: IF_KW@2..4 "if" [] [],
+               expression: missing (required),
+               r_curly_token: R_CURLY@4..5 "}" [] [],
+               children: HtmlElementList [

but I'm unsure if this is a proper use of whitespace consumption and touches a lot. Would like your thoughts.. not something I will address in this PR.

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Yeah I believe it's safe to move the whitespace to the token instead. Worth sending a different PR because this change will cause havoc

@solithcy solithcy force-pushed the fix/svelte-expression-crash branch from 39aac30 to ce40a0a Compare April 27, 2026 21:22
@solithcy solithcy force-pushed the fix/svelte-expression-crash branch from 3413712 to ad1edac Compare April 28, 2026 11:02
@ematipico ematipico merged commit e7024b9 into biomejs:main Apr 28, 2026
29 checks passed
@github-actions github-actions Bot mentioned this pull request Apr 28, 2026
OIRNOIR pushed a commit to OIRNOIR/YouTube-Helper-Client that referenced this pull request May 4, 2026
This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [@biomejs/biome](https://biomejs.dev) ([source](https://github.com/biomejs/biome/tree/HEAD/packages/@biomejs/biome)) | imports | patch | [`2.4.13` -> `2.4.14`](https://renovatebot.com/diffs/npm/@biomejs%2fbiome/2.4.13/2.4.14) |

---

### Release Notes

<details>
<summary>biomejs/biome (@&#8203;biomejs/biome)</summary>

### [`v2.4.14`](https://github.com/biomejs/biome/blob/HEAD/packages/@&#8203;biomejs/biome/CHANGELOG.md#2414)

[Compare Source](https://github.com/biomejs/biome/compare/@biomejs/biome@2.4.13...@biomejs/biome@2.4.14)

##### Patch Changes

- [#&#8203;9393](biomejs/biome#9393) [`491b171`](biomejs/biome@491b171) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Added the nursery rule [`useTestHooksOnTop`](https://biomejs.dev/linter/rules/use-test-hooks-on-top) in the `test` domain. The rule flags lifecycle hooks (`beforeEach`, `beforeAll`, `afterEach`, `afterAll`) that appear after test cases in the same block, enforcing that hooks are defined before any test case.

- [#&#8203;10157](biomejs/biome#10157) [`eefc5ab`](biomejs/biome@eefc5ab) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed [#&#8203;7882](biomejs/biome#7882): The HTML parser will now emit better diagnostics when it encounters a void element with a closing tag, such as `<br></br>`. Previously, the parser would emit multiple diagnostics with conflicting advice. Now it emits a single diagnostic that clearly states that void elements should not have closing tags.

- [#&#8203;10054](biomejs/biome#10054) [`0e9f569`](biomejs/biome@0e9f569) Thanks [@&#8203;minseong0324](https://github.com/minseong0324)! - [`noMisleadingReturnType`](https://biomejs.dev/linter/rules/no-misleading-return-type/) no longer misses widening from concrete object types, class instances, object literals, tuples, functions, and regular expressions to `: object`.

  A function annotated `: object` returning an object literal:

  ```ts
  function f(): object {
    return { retry: true };
  }
  ```

- [#&#8203;10116](biomejs/biome#10116) [`53269eb`](biomejs/biome@53269eb) Thanks [@&#8203;jiwon79](https://github.com/jiwon79)! - Fixed [#&#8203;6201](biomejs/biome#6201): [`noUselessEscapeInRegex`](https://biomejs.dev/linter/rules/no-useless-escape-in-regex/) no longer flags an escaped backslash followed by `-` as a useless escape. Patterns like `/[\\-]/` are now considered valid because the second `\` is the escaped backslash, not an unnecessary escape of the trailing dash.

- [#&#8203;10092](biomejs/biome#10092) [`33d8543`](biomejs/biome@33d8543) Thanks [@&#8203;Conaclos](https://github.com/Conaclos)! - Fixed [#&#8203;9097](biomejs/biome#9097): [`organizeImports`](https://biomejs.dev/assist/actions/organize-imports/) no longer adds a blank line between a never-matched group and a matched group.

  Given the following `organizeImports` options:

  ```json
  {
    "groups": [":NODE:", ":BLANK_LINE:", ":PACKAGE:", ":BLANK_LINE:", ":PATH:"]
  }
  ```

  The following code...

  ```js
  // Comment
  import "package";
  import "./file.js";
  ```

  ...was organized as:

  ```diff
  +
    // Comment
    import "package";
  +
    import "./file.js";
  ```

  A blank line was added even though the group ':NODE:' doesn't match any imports here.
  `:BLANK_LINE:` between never-matched groups and matched groups are now ignored.
  The code is now organized as:

  ```diff
    // Comment
    import "package";
  +
    import "./file.js";
  ```

- [#&#8203;10138](biomejs/biome#10138) [`a10b6c1`](biomejs/biome@a10b6c1) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed Vue `v-for` handling for [`noUndeclaredVariables`](https://biomejs.dev/linter/rules/no-undeclared-variables/) and [`noUnusedVariables`](https://biomejs.dev/linter/rules/no-unused-variables/). Biome now recognizes variables declared by `v-for` directives and references to iterated values in Vue templates.

- [#&#8203;10115](biomejs/biome#10115) [`d428d76`](biomejs/biome@d428d76) Thanks [@&#8203;minseong0324](https://github.com/minseong0324)! - [`noMisleadingReturnType`](https://biomejs.dev/linter/rules/no-misleading-return-type/) no longer reports false positives when a union return type's `boolean` variant is covered by both `true` and `false` returns.

- [#&#8203;9922](biomejs/biome#9922) [`7acf1e0`](biomejs/biome@7acf1e0) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Added the new nursery rule [`noReactStringRefs`](https://biomejs.dev/linter/rules/no-react-string-refs/), which disallows legacy React string refs such as `ref="hello"` and `this.refs.hello`.

  Biome also reports template-literal refs such as ``ref={`hello`}``, so React code can consistently migrate to callback refs, `createRef()`, or `useRef()`.

- [#&#8203;10010](biomejs/biome#10010) [`f3e76ab`](biomejs/biome@f3e76ab) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed a bug in the LSP file watcher registration so Biome now watches `.biome.json` and `.biome.jsonc` configuration files and reloads workspace settings when they change.

- [#&#8203;10176](biomejs/biome#10176) [`8a40ef8`](biomejs/biome@8a40ef8) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed [#&#8203;10011](biomejs/biome#10011): The [`noThisInStatic`](https://biomejs.dev/linter/rules/no-this-in-static/) rule no longer reports `this` when it is used as the constructor target in `new this(...)`, which is required for inherited static factory methods.

- [#&#8203;10163](biomejs/biome#10163) [`6867e96`](biomejs/biome@6867e96) Thanks [@&#8203;jiwon79](https://github.com/jiwon79)! - Fixed [#&#8203;9884](biomejs/biome#9884): The [`useSortedAttributes`](https://biomejs.dev/assist/actions/use-sorted-attributes/) auto-fix no longer corrupts source code when both an outer JSX element and a nested JSX-valued attribute have unsorted attributes in the same pass. Multiple unsorted groups separated by spread or shorthand attributes within the same JSX element are now reported as a single diagnostic.

- [#&#8203;10079](biomejs/biome#10079) [`d29dd19`](biomejs/biome@d29dd19) Thanks [@&#8203;Damix48](https://github.com/Damix48)! - Fixed false positive in `noAssignInExpressions` for Svelte `{@&#8203;const}` blocks. Assignments in `{@&#8203;const name = value}` are now correctly recognized as declarations rather than accidental assignments in expressions.

- [#&#8203;10080](biomejs/biome#10080) [`5d8fdac`](biomejs/biome@5d8fdac) Thanks [@&#8203;Damix48](https://github.com/Damix48)! - Fixed parsing of closing parentheses in Svelte `{#each}` block key expressions. Biome now correctly parses method calls and other parenthesised expressions used as keys.

  For example, the following snippets are now parsed correctly:

  ```svelte
  {#each numbers as number, index (number.toString())}
    <p>{number}</p>
  {/each}

  {#each numbers as number (key(number))}
    <p>{number}</p>
  {/each}
  ```

- [#&#8203;10140](biomejs/biome#10140) [`e7024b9`](biomejs/biome@e7024b9) Thanks [@&#8203;solithcy](https://github.com/solithcy)! - Fixed [#&#8203;10135](biomejs/biome#10135): Biome no longer crashes on missing Svelte template expressions.

  The following code snippet longer panics:

  ```svelte
  {#if }
   <p>^ this would previously crash</p>
  {/if}
  {@&#8203;const }
  <p>    ^ this would also crash</p>
  ```

- [#&#8203;10111](biomejs/biome#10111) [`7818009`](biomejs/biome@7818009) Thanks [@&#8203;jiwon79](https://github.com/jiwon79)! - Fixed [#&#8203;9997](biomejs/biome#9997): [`noDuplicateSelectors`](https://biomejs.dev/linter/rules/no-duplicate-selectors/) no longer reports false positives for selectors inside `@scope` queries. Biome now treats `@scope` as a separate at-rule context, like `@media`, `@supports`, `@container`, and `@starting-style`.

  The following snippet is no longer flagged as a duplicate:

  ```css
  .Example {
    padding: 0;
  }

  @&#8203;scope (.theme-dark) {
    .Example {
      color: white;
    }
  }
  ```

- [#&#8203;9926](biomejs/biome#9926) [`d62b331`](biomejs/biome@d62b331) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Added the nursery lint rule [`useMathMinMax`](https://biomejs.dev/linter/rules/use-math-min-max/), which prefers `Math.min()` and `Math.max()` over equivalent ternary comparisons.

  For example, this code:

  ```js
  const min = a < b ? a : b;
  ```

  is much more readable when rewritten as:

  ```js
  const min = Math.min(a, b);
  ```

- [#&#8203;10115](biomejs/biome#10115) [`d428d76`](biomejs/biome@d428d76) Thanks [@&#8203;minseong0324](https://github.com/minseong0324)! - [`useExhaustiveSwitchCases`](https://biomejs.dev/linter/rules/use-exhaustive-switch-cases/) now flags missing `true`/`false` cases for `boolean` discriminants, including when `boolean` is a union variant.

- [#&#8203;10125](biomejs/biome#10125) [`a55a0b6`](biomejs/biome@a55a0b6) Thanks [@&#8203;bmish](https://github.com/bmish)! - Fixed a resolver bug where packages that define a typed entry point through `package.json`'s `main` field but omit `types` were ignored during type-aware resolution. Type-aware rules such as [`noFloatingPromises`](https://biomejs.dev/linter/rules/no-floating-promises/) can now inspect imports from those packages.

- [#&#8203;10117](biomejs/biome#10117) [`895e809`](biomejs/biome@895e809) Thanks [@&#8203;denizdogan](https://github.com/denizdogan)! - Added support for the `corner-shape` family of CSS properties and the `superellipse()`/`squircle()` value functions, so [`noUnknownProperty`](https://biomejs.dev/linter/rules/no-unknown-property/) and [`noUnknownFunction`](https://biomejs.dev/linter/rules/no-unknown-function/) no longer flag them as unknown.

  New known properties: `corner-shape`, `corner-block-end-shape`, `corner-block-start-shape`, `corner-bottom-left-shape`, `corner-bottom-right-shape`, `corner-bottom-shape`, `corner-end-end-shape`, `corner-end-start-shape`, `corner-inline-end-shape`, `corner-inline-start-shape`, `corner-left-shape`, `corner-right-shape`, `corner-start-end-shape`, `corner-start-start-shape`, `corner-top-left-shape`, `corner-top-right-shape`, `corner-top-shape`.

  New known value functions: `superellipse()`, `squircle()`.

- [#&#8203;8620](biomejs/biome#8620) [`8df8f73`](biomejs/biome@8df8f73) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed [#&#8203;8062](biomejs/biome#8062): Added support for parsing Vue `v-for` directives more accurately.

- [#&#8203;10191](biomejs/biome#10191) [`aa055cd`](biomejs/biome@aa055cd) Thanks [@&#8203;guney](https://github.com/guney)! - Now the rule [`noStaticElementInteractions`](https://biomejs.dev/linter/rules/no-static-element-interactions/) doesn't trigger custom elements.

- [#&#8203;9757](biomejs/biome#9757) [`2c62594`](biomejs/biome@2c62594) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed [#&#8203;9099](biomejs/biome#9099): the HTML formatter collapsing non-text children (inline elements, Svelte expressions, comments) onto a single line when the source had them on separate lines. Biome now preserves the user's intended line breaks for exclusively non-text children.

  For example, the following Svelte snippet is now preserved instead of being collapsed to `<div>{name}<!-- comment --></div>`:

  ```svelte
  <div>
    {name}<!-- comment -->
  </div>
  ```

  Similarly, HTML elements like `<span>` inside a `<div>` are now preserved when written on their own line:

  ```html
  <div>
    <span>text</span>
  </div>
  ```

- [#&#8203;10105](biomejs/biome#10105) [`e7c1a6d`](biomejs/biome@e7c1a6d) Thanks [@&#8203;jiwon79](https://github.com/jiwon79)! - Fixed [#&#8203;10039](biomejs/biome#10039): [`useReadonlyClassProperties`](https://biomejs.dev/linter/rules/use-readonly-class-properties/) now detects unreassigned private members in class expressions and export default classes, not only in class declarations.

  The following patterns are now correctly flagged:

  ```ts
  const AnonClass = class {
    #prop = 123;
    constructor() {
      console.log(this.#prop);
    }
  };

  export default class {
    #prop = 123;
    constructor() {
      console.log(this.#prop);
    }
  }
  ```

- [#&#8203;10141](biomejs/biome#10141) [`46a77d0`](biomejs/biome@46a77d0) Thanks [@&#8203;minseong0324](https://github.com/minseong0324)! - Improved [`noUnnecessaryConditions`](https://biomejs.dev/linter/rules/no-unnecessary-conditions/) to detect conditions that are always truthy because they check built-in global class instances such as `Date`, `Map`, `Set`, `WeakMap`, and `Error`.

- [#&#8203;10178](biomejs/biome#10178) [`7b05a89`](biomejs/biome@7b05a89) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed [#&#8203;10177](biomejs/biome#10177): The HTML parser no longer reports lowercase `html` or `doctype` text as invalid after void elements such as `<br>`.

- [#&#8203;10155](biomejs/biome#10155) [`0d4595d`](biomejs/biome@0d4595d) Thanks [@&#8203;jiwon79](https://github.com/jiwon79)! - Fixed [#&#8203;10045](biomejs/biome#10045): the CSS formatter no longer compounds indentation inside nested functional pseudo-classes such as `:not(:where(...))`, `:is(:where(...))`, and similar combinations. The same fix also removes one level of unnecessary indentation that was added inside any pseudo-class function whose argument list wrapped onto multiple lines, including `:nth-child(... of ...)`, `::part(...)`, and `:active-view-transition-type(...)`.
  The following snippet is now correctly formatted, matching Prettier.

  ```css
  input:not(
    :where(
      [type="submit"],
      [type="checkbox"],
      [type="radio"],
      [type="button"],
      [type="reset"]
    )
  ) {
    inline-size: 100%;
  }
  ```

- [#&#8203;10112](biomejs/biome#10112) [`6f0251e`](biomejs/biome@6f0251e) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed [#&#8203;10110](biomejs/biome#10110): Biome's parser now accepts surrogate code points in JavaScript string `\u{...}` escapes.

- [#&#8203;10141](biomejs/biome#10141) [`46a77d0`](biomejs/biome@46a77d0) Thanks [@&#8203;minseong0324](https://github.com/minseong0324)! - Improved [`noMisleadingReturnType`](https://biomejs.dev/linter/rules/no-misleading-return-type/) to detect `object` return annotations that hide built-in global class instances such as `Date`, `Map`, `Set`, `WeakMap`, and `Error`.

- [#&#8203;10083](biomejs/biome#10083) [`4a664c1`](biomejs/biome@4a664c1) Thanks [@&#8203;ematipico](https://github.com/ematipico)! - Added two new options to [`noShadow`](https://biomejs.dev/linter/rules/no-shadow/), both defaulting to `true` to match typescript-eslint's behavior.

  Fixed [#&#8203;9482](biomejs/biome#9482): Added `ignoreFunctionTypeParameterNameValueShadow` option. When enabled, parameter names inside function type annotations (e.g. `(options: unknown) => void`) are not flagged as shadowing outer variables.

  Fixed [#&#8203;7812](biomejs/biome#7812): Added `ignoreTypeValueShadow` option. When enabled, a value binding that shares its name with a type-only declaration (type alias or interface) is not flagged, since types and values occupy separate namespaces in TypeScript.

- [#&#8203;9286](biomejs/biome#9286) [`52695cf`](biomejs/biome@52695cf) Thanks [@&#8203;Hugo-Polloli](https://github.com/Hugo-Polloli)! - Fixed [#&#8203;6316](biomejs/biome#6316): Biome now resolves Svelte `$store` references to the underlying `store` binding in semantic analysis, preventing false `noUndeclaredVariables` diagnostics when the store is declared.

- [#&#8203;10188](biomejs/biome#10188) [`ae659dd`](biomejs/biome@ae659dd) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Added a new nursery rule [`noExcessiveNestedCallbacks`](https://biomejs.dev/linter/rules/no-excessive-nested-callbacks/), which disallows callbacks nested deeper than the configured maximum.

- [#&#8203;9757](biomejs/biome#9757) [`2c62594`](biomejs/biome@2c62594) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed [#&#8203;9450](biomejs/biome#9450): the HTML formatter now correctly preserves multiline formatting for nested `<template>` elements (e.g. `<template #body>`) when the source has children on separate lines. Previously, the children were collapsed onto a single line.

  ```diff
   <template>
     <UModal>
  -    <template #body> <p>content</p> </template>
  +    <template #body>
  +      <p>content</p>
  +    </template>
     </UModal>
   </template>
  ```

- [#&#8203;10118](biomejs/biome#10118) [`c6edcb4`](biomejs/biome@c6edcb4) Thanks [@&#8203;Netail](https://github.com/Netail)! - Fixed [#&#8203;10024](biomejs/biome#10024): `biome migrate eslint` correctly migrates `eslint` rules that belong to multiple Biome rules.

</details>

---

### Configuration

📅 **Schedule**: (UTC)

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

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, 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:eyJjcmVhdGVkSW5WZXIiOiI0My4xNjAuMiIsInVwZGF0ZWRJblZlciI6IjQzLjE2MC4yIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

Reviewed-on: https://git.oirnoir.dev/OIRNOIR/YouTube-Helper-Client/pulls/2
OIRNOIR pushed a commit to OIRNOIR/YouTube-Helper-Server that referenced this pull request May 5, 2026
This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [@biomejs/biome](https://biomejs.dev) ([source](https://github.com/biomejs/biome/tree/HEAD/packages/@biomejs/biome)) | imports | patch | [`2.4.13` -> `2.4.14`](https://renovatebot.com/diffs/npm/@biomejs%2fbiome/2.4.13/2.4.14) |

---

### Release Notes

<details>
<summary>biomejs/biome (@&#8203;biomejs/biome)</summary>

### [`v2.4.14`](https://github.com/biomejs/biome/blob/HEAD/packages/@&#8203;biomejs/biome/CHANGELOG.md#2414)

[Compare Source](https://github.com/biomejs/biome/compare/@biomejs/biome@2.4.13...@biomejs/biome@2.4.14)

##### Patch Changes

- [#&#8203;9393](biomejs/biome#9393) [`491b171`](biomejs/biome@491b171) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Added the nursery rule [`useTestHooksOnTop`](https://biomejs.dev/linter/rules/use-test-hooks-on-top) in the `test` domain. The rule flags lifecycle hooks (`beforeEach`, `beforeAll`, `afterEach`, `afterAll`) that appear after test cases in the same block, enforcing that hooks are defined before any test case.

- [#&#8203;10157](biomejs/biome#10157) [`eefc5ab`](biomejs/biome@eefc5ab) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed [#&#8203;7882](biomejs/biome#7882): The HTML parser will now emit better diagnostics when it encounters a void element with a closing tag, such as `<br></br>`. Previously, the parser would emit multiple diagnostics with conflicting advice. Now it emits a single diagnostic that clearly states that void elements should not have closing tags.

- [#&#8203;10054](biomejs/biome#10054) [`0e9f569`](biomejs/biome@0e9f569) Thanks [@&#8203;minseong0324](https://github.com/minseong0324)! - [`noMisleadingReturnType`](https://biomejs.dev/linter/rules/no-misleading-return-type/) no longer misses widening from concrete object types, class instances, object literals, tuples, functions, and regular expressions to `: object`.

  A function annotated `: object` returning an object literal:

  ```ts
  function f(): object {
    return { retry: true };
  }
  ```

- [#&#8203;10116](biomejs/biome#10116) [`53269eb`](biomejs/biome@53269eb) Thanks [@&#8203;jiwon79](https://github.com/jiwon79)! - Fixed [#&#8203;6201](biomejs/biome#6201): [`noUselessEscapeInRegex`](https://biomejs.dev/linter/rules/no-useless-escape-in-regex/) no longer flags an escaped backslash followed by `-` as a useless escape. Patterns like `/[\\-]/` are now considered valid because the second `\` is the escaped backslash, not an unnecessary escape of the trailing dash.

- [#&#8203;10092](biomejs/biome#10092) [`33d8543`](biomejs/biome@33d8543) Thanks [@&#8203;Conaclos](https://github.com/Conaclos)! - Fixed [#&#8203;9097](biomejs/biome#9097): [`organizeImports`](https://biomejs.dev/assist/actions/organize-imports/) no longer adds a blank line between a never-matched group and a matched group.

  Given the following `organizeImports` options:

  ```json
  {
    "groups": [":NODE:", ":BLANK_LINE:", ":PACKAGE:", ":BLANK_LINE:", ":PATH:"]
  }
  ```

  The following code...

  ```js
  // Comment
  import "package";
  import "./file.js";
  ```

  ...was organized as:

  ```diff
  +
    // Comment
    import "package";
  +
    import "./file.js";
  ```

  A blank line was added even though the group ':NODE:' doesn't match any imports here.
  `:BLANK_LINE:` between never-matched groups and matched groups are now ignored.
  The code is now organized as:

  ```diff
    // Comment
    import "package";
  +
    import "./file.js";
  ```

- [#&#8203;10138](biomejs/biome#10138) [`a10b6c1`](biomejs/biome@a10b6c1) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed Vue `v-for` handling for [`noUndeclaredVariables`](https://biomejs.dev/linter/rules/no-undeclared-variables/) and [`noUnusedVariables`](https://biomejs.dev/linter/rules/no-unused-variables/). Biome now recognizes variables declared by `v-for` directives and references to iterated values in Vue templates.

- [#&#8203;10115](biomejs/biome#10115) [`d428d76`](biomejs/biome@d428d76) Thanks [@&#8203;minseong0324](https://github.com/minseong0324)! - [`noMisleadingReturnType`](https://biomejs.dev/linter/rules/no-misleading-return-type/) no longer reports false positives when a union return type's `boolean` variant is covered by both `true` and `false` returns.

- [#&#8203;9922](biomejs/biome#9922) [`7acf1e0`](biomejs/biome@7acf1e0) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Added the new nursery rule [`noReactStringRefs`](https://biomejs.dev/linter/rules/no-react-string-refs/), which disallows legacy React string refs such as `ref="hello"` and `this.refs.hello`.

  Biome also reports template-literal refs such as ``ref={`hello`}``, so React code can consistently migrate to callback refs, `createRef()`, or `useRef()`.

- [#&#8203;10010](biomejs/biome#10010) [`f3e76ab`](biomejs/biome@f3e76ab) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed a bug in the LSP file watcher registration so Biome now watches `.biome.json` and `.biome.jsonc` configuration files and reloads workspace settings when they change.

- [#&#8203;10176](biomejs/biome#10176) [`8a40ef8`](biomejs/biome@8a40ef8) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed [#&#8203;10011](biomejs/biome#10011): The [`noThisInStatic`](https://biomejs.dev/linter/rules/no-this-in-static/) rule no longer reports `this` when it is used as the constructor target in `new this(...)`, which is required for inherited static factory methods.

- [#&#8203;10163](biomejs/biome#10163) [`6867e96`](biomejs/biome@6867e96) Thanks [@&#8203;jiwon79](https://github.com/jiwon79)! - Fixed [#&#8203;9884](biomejs/biome#9884): The [`useSortedAttributes`](https://biomejs.dev/assist/actions/use-sorted-attributes/) auto-fix no longer corrupts source code when both an outer JSX element and a nested JSX-valued attribute have unsorted attributes in the same pass. Multiple unsorted groups separated by spread or shorthand attributes within the same JSX element are now reported as a single diagnostic.

- [#&#8203;10079](biomejs/biome#10079) [`d29dd19`](biomejs/biome@d29dd19) Thanks [@&#8203;Damix48](https://github.com/Damix48)! - Fixed false positive in `noAssignInExpressions` for Svelte `{@&#8203;const}` blocks. Assignments in `{@&#8203;const name = value}` are now correctly recognized as declarations rather than accidental assignments in expressions.

- [#&#8203;10080](biomejs/biome#10080) [`5d8fdac`](biomejs/biome@5d8fdac) Thanks [@&#8203;Damix48](https://github.com/Damix48)! - Fixed parsing of closing parentheses in Svelte `{#each}` block key expressions. Biome now correctly parses method calls and other parenthesised expressions used as keys.

  For example, the following snippets are now parsed correctly:

  ```svelte
  {#each numbers as number, index (number.toString())}
    <p>{number}</p>
  {/each}

  {#each numbers as number (key(number))}
    <p>{number}</p>
  {/each}
  ```

- [#&#8203;10140](biomejs/biome#10140) [`e7024b9`](biomejs/biome@e7024b9) Thanks [@&#8203;solithcy](https://github.com/solithcy)! - Fixed [#&#8203;10135](biomejs/biome#10135): Biome no longer crashes on missing Svelte template expressions.

  The following code snippet longer panics:

  ```svelte
  {#if }
   <p>^ this would previously crash</p>
  {/if}
  {@&#8203;const }
  <p>    ^ this would also crash</p>
  ```

- [#&#8203;10111](biomejs/biome#10111) [`7818009`](biomejs/biome@7818009) Thanks [@&#8203;jiwon79](https://github.com/jiwon79)! - Fixed [#&#8203;9997](biomejs/biome#9997): [`noDuplicateSelectors`](https://biomejs.dev/linter/rules/no-duplicate-selectors/) no longer reports false positives for selectors inside `@scope` queries. Biome now treats `@scope` as a separate at-rule context, like `@media`, `@supports`, `@container`, and `@starting-style`.

  The following snippet is no longer flagged as a duplicate:

  ```css
  .Example {
    padding: 0;
  }

  @&#8203;scope (.theme-dark) {
    .Example {
      color: white;
    }
  }
  ```

- [#&#8203;9926](biomejs/biome#9926) [`d62b331`](biomejs/biome@d62b331) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Added the nursery lint rule [`useMathMinMax`](https://biomejs.dev/linter/rules/use-math-min-max/), which prefers `Math.min()` and `Math.max()` over equivalent ternary comparisons.

  For example, this code:

  ```js
  const min = a < b ? a : b;
  ```

  is much more readable when rewritten as:

  ```js
  const min = Math.min(a, b);
  ```

- [#&#8203;10115](biomejs/biome#10115) [`d428d76`](biomejs/biome@d428d76) Thanks [@&#8203;minseong0324](https://github.com/minseong0324)! - [`useExhaustiveSwitchCases`](https://biomejs.dev/linter/rules/use-exhaustive-switch-cases/) now flags missing `true`/`false` cases for `boolean` discriminants, including when `boolean` is a union variant.

- [#&#8203;10125](biomejs/biome#10125) [`a55a0b6`](biomejs/biome@a55a0b6) Thanks [@&#8203;bmish](https://github.com/bmish)! - Fixed a resolver bug where packages that define a typed entry point through `package.json`'s `main` field but omit `types` were ignored during type-aware resolution. Type-aware rules such as [`noFloatingPromises`](https://biomejs.dev/linter/rules/no-floating-promises/) can now inspect imports from those packages.

- [#&#8203;10117](biomejs/biome#10117) [`895e809`](biomejs/biome@895e809) Thanks [@&#8203;denizdogan](https://github.com/denizdogan)! - Added support for the `corner-shape` family of CSS properties and the `superellipse()`/`squircle()` value functions, so [`noUnknownProperty`](https://biomejs.dev/linter/rules/no-unknown-property/) and [`noUnknownFunction`](https://biomejs.dev/linter/rules/no-unknown-function/) no longer flag them as unknown.

  New known properties: `corner-shape`, `corner-block-end-shape`, `corner-block-start-shape`, `corner-bottom-left-shape`, `corner-bottom-right-shape`, `corner-bottom-shape`, `corner-end-end-shape`, `corner-end-start-shape`, `corner-inline-end-shape`, `corner-inline-start-shape`, `corner-left-shape`, `corner-right-shape`, `corner-start-end-shape`, `corner-start-start-shape`, `corner-top-left-shape`, `corner-top-right-shape`, `corner-top-shape`.

  New known value functions: `superellipse()`, `squircle()`.

- [#&#8203;8620](biomejs/biome#8620) [`8df8f73`](biomejs/biome@8df8f73) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed [#&#8203;8062](biomejs/biome#8062): Added support for parsing Vue `v-for` directives more accurately.

- [#&#8203;10191](biomejs/biome#10191) [`aa055cd`](biomejs/biome@aa055cd) Thanks [@&#8203;guney](https://github.com/guney)! - Now the rule [`noStaticElementInteractions`](https://biomejs.dev/linter/rules/no-static-element-interactions/) doesn't trigger custom elements.

- [#&#8203;9757](biomejs/biome#9757) [`2c62594`](biomejs/biome@2c62594) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed [#&#8203;9099](biomejs/biome#9099): the HTML formatter collapsing non-text children (inline elements, Svelte expressions, comments) onto a single line when the source had them on separate lines. Biome now preserves the user's intended line breaks for exclusively non-text children.

  For example, the following Svelte snippet is now preserved instead of being collapsed to `<div>{name}<!-- comment --></div>`:

  ```svelte
  <div>
    {name}<!-- comment -->
  </div>
  ```

  Similarly, HTML elements like `<span>` inside a `<div>` are now preserved when written on their own line:

  ```html
  <div>
    <span>text</span>
  </div>
  ```

- [#&#8203;10105](biomejs/biome#10105) [`e7c1a6d`](biomejs/biome@e7c1a6d) Thanks [@&#8203;jiwon79](https://github.com/jiwon79)! - Fixed [#&#8203;10039](biomejs/biome#10039): [`useReadonlyClassProperties`](https://biomejs.dev/linter/rules/use-readonly-class-properties/) now detects unreassigned private members in class expressions and export default classes, not only in class declarations.

  The following patterns are now correctly flagged:

  ```ts
  const AnonClass = class {
    #prop = 123;
    constructor() {
      console.log(this.#prop);
    }
  };

  export default class {
    #prop = 123;
    constructor() {
      console.log(this.#prop);
    }
  }
  ```

- [#&#8203;10141](biomejs/biome#10141) [`46a77d0`](biomejs/biome@46a77d0) Thanks [@&#8203;minseong0324](https://github.com/minseong0324)! - Improved [`noUnnecessaryConditions`](https://biomejs.dev/linter/rules/no-unnecessary-conditions/) to detect conditions that are always truthy because they check built-in global class instances such as `Date`, `Map`, `Set`, `WeakMap`, and `Error`.

- [#&#8203;10178](biomejs/biome#10178) [`7b05a89`](biomejs/biome@7b05a89) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed [#&#8203;10177](biomejs/biome#10177): The HTML parser no longer reports lowercase `html` or `doctype` text as invalid after void elements such as `<br>`.

- [#&#8203;10155](biomejs/biome#10155) [`0d4595d`](biomejs/biome@0d4595d) Thanks [@&#8203;jiwon79](https://github.com/jiwon79)! - Fixed [#&#8203;10045](biomejs/biome#10045): the CSS formatter no longer compounds indentation inside nested functional pseudo-classes such as `:not(:where(...))`, `:is(:where(...))`, and similar combinations. The same fix also removes one level of unnecessary indentation that was added inside any pseudo-class function whose argument list wrapped onto multiple lines, including `:nth-child(... of ...)`, `::part(...)`, and `:active-view-transition-type(...)`.
  The following snippet is now correctly formatted, matching Prettier.

  ```css
  input:not(
    :where(
      [type="submit"],
      [type="checkbox"],
      [type="radio"],
      [type="button"],
      [type="reset"]
    )
  ) {
    inline-size: 100%;
  }
  ```

- [#&#8203;10112](biomejs/biome#10112) [`6f0251e`](biomejs/biome@6f0251e) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed [#&#8203;10110](biomejs/biome#10110): Biome's parser now accepts surrogate code points in JavaScript string `\u{...}` escapes.

- [#&#8203;10141](biomejs/biome#10141) [`46a77d0`](biomejs/biome@46a77d0) Thanks [@&#8203;minseong0324](https://github.com/minseong0324)! - Improved [`noMisleadingReturnType`](https://biomejs.dev/linter/rules/no-misleading-return-type/) to detect `object` return annotations that hide built-in global class instances such as `Date`, `Map`, `Set`, `WeakMap`, and `Error`.

- [#&#8203;10083](biomejs/biome#10083) [`4a664c1`](biomejs/biome@4a664c1) Thanks [@&#8203;ematipico](https://github.com/ematipico)! - Added two new options to [`noShadow`](https://biomejs.dev/linter/rules/no-shadow/), both defaulting to `true` to match typescript-eslint's behavior.

  Fixed [#&#8203;9482](biomejs/biome#9482): Added `ignoreFunctionTypeParameterNameValueShadow` option. When enabled, parameter names inside function type annotations (e.g. `(options: unknown) => void`) are not flagged as shadowing outer variables.

  Fixed [#&#8203;7812](biomejs/biome#7812): Added `ignoreTypeValueShadow` option. When enabled, a value binding that shares its name with a type-only declaration (type alias or interface) is not flagged, since types and values occupy separate namespaces in TypeScript.

- [#&#8203;9286](biomejs/biome#9286) [`52695cf`](biomejs/biome@52695cf) Thanks [@&#8203;Hugo-Polloli](https://github.com/Hugo-Polloli)! - Fixed [#&#8203;6316](biomejs/biome#6316): Biome now resolves Svelte `$store` references to the underlying `store` binding in semantic analysis, preventing false `noUndeclaredVariables` diagnostics when the store is declared.

- [#&#8203;10188](biomejs/biome#10188) [`ae659dd`](biomejs/biome@ae659dd) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Added a new nursery rule [`noExcessiveNestedCallbacks`](https://biomejs.dev/linter/rules/no-excessive-nested-callbacks/), which disallows callbacks nested deeper than the configured maximum.

- [#&#8203;9757](biomejs/biome#9757) [`2c62594`](biomejs/biome@2c62594) Thanks [@&#8203;dyc3](https://github.com/dyc3)! - Fixed [#&#8203;9450](biomejs/biome#9450): the HTML formatter now correctly preserves multiline formatting for nested `<template>` elements (e.g. `<template #body>`) when the source has children on separate lines. Previously, the children were collapsed onto a single line.

  ```diff
   <template>
     <UModal>
  -    <template #body> <p>content</p> </template>
  +    <template #body>
  +      <p>content</p>
  +    </template>
     </UModal>
   </template>
  ```

- [#&#8203;10118](biomejs/biome#10118) [`c6edcb4`](biomejs/biome@c6edcb4) Thanks [@&#8203;Netail](https://github.com/Netail)! - Fixed [#&#8203;10024](biomejs/biome#10024): `biome migrate eslint` correctly migrates `eslint` rules that belong to multiple Biome rules.

</details>

---

### Configuration

📅 **Schedule**: (UTC)

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

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

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Reviewed-on: https://git.oirnoir.dev/OIRNOIR/YouTube-Helper-Server/pulls/10
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🐛 [svelte] partial {@const} declaration panics

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