# Biome 2.5.12 — Biome CLI v2.5.12

- Product: Biome (https://whatsnew.fyi/product/biome)
- Vendor: Biome
- Date: 2026-09-03
- Version: 2.5.12
- Original notes: https://github.com/biomejs/biome/releases/tag/%40biomejs/biome%402.5.12
- Permalink: https://whatsnew.fyi/product/biome/releases/2.5.12

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

---

- **fixed** — Astro attribute expressions now accept TypeScript and JSX syntax that is accepted in text expressions
- **fixed** — Astro attribute names are no longer split on `:` and `.` inside an expression
- **fixed** — A bare `>` in the children of an Astro expression is no longer treated as markup
- **fixed** — HTML comments inside an Astro expression now parse correctly and are read as trivia
- **fixed** — Children of `is:raw` inside an Astro expression are no longer read as JSX
- **fixed** — An apostrophe or quote in the text of a JSX element inside an Astro expression no longer ends the expression early
- **fixed** — Children of `<script>` or `<style>` inside an Astro expression are now read as text instead of JSX
- **added** — Support for template literal attribute values inside an Astro expression
- **fixed** — Unquoted attribute values are now accepted inside an Astro expression
- **fixed** — A template literal nested inside `${}` no longer breaks the rest of an Astro file
- **fixed** — A quote inside a regex character class no longer breaks the rest of an Astro file
- **added** — Added nursery rule `useFlatMathMinMax` that reports unnecessary nested calls to Math.min() and Math.max()
- **fixed** — The `noUnresolvedImports` rule no longer reports Bun runtime built-in modules
- **fixed** — Biome now reports a diagnostic for excessively deep syntax instead of overflowing the native stack
- **added** — Added nursery rule `noThisOutsideOfClass` that reports `this` outside class members and TypeScript functions with an explicit `this` parameter

##### 2.5.12

###### Patch Changes

- [#11440](https://github.com/biomejs/biome/pull/11440) [`b88f1ea`](https://github.com/biomejs/biome/commit/b88f1ea368c727ff8ebeddcaf9448f6ddc7c4878) Thanks [@Princesseuh](https://github.com/Princesseuh)! - Fixed Astro attribute expressions rejecting TypeScript and JSX syntax that is accepted in text expressions.
  
  ```astro
  <Component icon={<Icon />} count={total as number} onSelect={(e: Event) => e} />
  ```

- [#11440](https://github.com/biomejs/biome/pull/11440) [`b88f1ea`](https://github.com/biomejs/biome/commit/b88f1ea368c727ff8ebeddcaf9448f6ddc7c4878) Thanks [@Princesseuh](https://github.com/Princesseuh)! - Fixed Astro attribute names being split on `:` and `.` inside an expression, such as `{x && <button x-on:keyup.enter={go} client:load.foo />}`.

- [#11440](https://github.com/biomejs/biome/pull/11440) [`b88f1ea`](https://github.com/biomejs/biome/commit/b88f1ea368c727ff8ebeddcaf9448f6ddc7c4878) Thanks [@Princesseuh](https://github.com/Princesseuh)! - Fixed a bare `>` in the children of an Astro expression being treated as markup, such as `{x && <div>a > b</div>}`.

- [#11440](https://github.com/biomejs/biome/pull/11440) [`b88f1ea`](https://github.com/biomejs/biome/commit/b88f1ea368c727ff8ebeddcaf9448f6ddc7c4878) Thanks [@Princesseuh](https://github.com/Princesseuh)! - Fixed HTML comments inside an Astro expression failing to parse. They are now read as trivia, wherever they appear among the children.
  
  ```astro
  {x && <div><!-- first -->text<!-- last --></div>}
  {cond && <a></a><!-- c --><b></b>}
  ```

- [#11440](https://github.com/biomejs/biome/pull/11440) [`b88f1ea`](https://github.com/biomejs/biome/commit/b88f1ea368c727ff8ebeddcaf9448f6ddc7c4878) Thanks [@Princesseuh](https://github.com/Princesseuh)! - Fixed `is:raw` children inside an Astro expression being read as JSX, such as `{x && <div is:raw>{not js} < & text</div>}`.

- [#11440](https://github.com/biomejs/biome/pull/11440) [`b88f1ea`](https://github.com/biomejs/biome/commit/b88f1ea368c727ff8ebeddcaf9448f6ddc7c4878) Thanks [@Princesseuh](https://github.com/Princesseuh)! - Fixed an apostrophe or quote in the text of a JSX element inside an Astro expression ending the expression early, such as `{items.map((i) => <li>it's {i}</li>)}`.

- [#11440](https://github.com/biomejs/biome/pull/11440) [`b88f1ea`](https://github.com/biomejs/biome/commit/b88f1ea368c727ff8ebeddcaf9448f6ddc7c4878) Thanks [@Princesseuh](https://github.com/Princesseuh)! - Fixed the children of a `<script>` or `<style>` inside an Astro expression being read as JSX. Their contents are text, so braces and comparisons no longer have to be escaped.
  
  ```astro
  {cond && <style>a { color: red }</style>}
  {cond && <script>let x = {a: 1};</script>}
  ```

- [#11440](https://github.com/biomejs/biome/pull/11440) [`b88f1ea`](https://github.com/biomejs/biome/commit/b88f1ea368c727ff8ebeddcaf9448f6ddc7c4878) Thanks [@Princesseuh](https://github.com/Princesseuh)! - Added support for template literal attribute values inside an Astro expression, such as ``{x && <C data-x=`t${x}` />}``.

- [#11440](https://github.com/biomejs/biome/pull/11440) [`b88f1ea`](https://github.com/biomejs/biome/commit/b88f1ea368c727ff8ebeddcaf9448f6ddc7c4878) Thanks [@Princesseuh](https://github.com/Princesseuh)! - Fixed unquoted attribute values being rejected inside an Astro expression, such as `{x && <a class=foo maxlength=255 href=/about>go</a>}`.

- [#11440](https://github.com/biomejs/biome/pull/11440) [`b88f1ea`](https://github.com/biomejs/biome/commit/b88f1ea368c727ff8ebeddcaf9448f6ddc7c4878) Thanks [@Princesseuh](https://github.com/Princesseuh)! - Fixed a template literal nested inside `${}` breaking the rest of an Astro file, such as ``const href = `/blog${page === 0 ? '' : `/${page + 1}`}`;``.

- [#11440](https://github.com/biomejs/biome/pull/11440) [`b88f1ea`](https://github.com/biomejs/biome/commit/b88f1ea368c727ff8ebeddcaf9448f6ddc7c4878) Thanks [@Princesseuh](https://github.

_[Truncated at 4000 characters — full notes: https://github.com/biomejs/biome/releases/tag/%40biomejs/biome%402.5.12]_