fix(useAwait): treat await using as an async operation by Turtle-Hwan · Pull Request #11252 · biomejs/biome

Turtle-Hwan · 2026-08-06T06:57:15Z

Summary

useAwait now treats await using declarations as async operations.

This PR was primarily implemented with OpenAI Codex, including codebase analysis, code changes, tests, validation, and preparation of this description.

Test Plan

Added regression coverage for await using in async functions, async generators, and for...of, plus a control case for plain using.

Docs

Updated the rule documentation with an await using example.

changeset-bot · 2026-08-06T06:57:20Z

🦋 Changeset detected

Latest commit: 0537681

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 · 2026-08-06T06:57:29Z

✅ Organic activity

No automation signals detected in the analyzed events.

View full analysis →

_{This is an automated analysis by AgentScan}

coderabbitai · 2026-08-06T07:02:49Z

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 264935e3-53cb-4b97-8f61-ece0f07f7309

📥 Commits

Reviewing files that changed from the base of the PR and between bd0b68d and 0537681.

⛔ Files ignored due to path filters (2)

crates/biome_js_analyze/tests/specs/suspicious/useAwait/invalid.js.snap is excluded by !**/*.snap and included by **
crates/biome_js_analyze/tests/specs/suspicious/useAwait/valid.js.snap is excluded by !**/*.snap and included by **

📒 Files selected for processing (4)

.changeset/cuddly-places-bow.md
crates/biome_js_analyze/src/lint/suspicious/use_await.rs
crates/biome_js_analyze/tests/specs/suspicious/useAwait/invalid.js
crates/biome_js_analyze/tests/specs/suspicious/useAwait/valid.js

Walkthrough

The useAwait rule now treats await using declarations and for await variable declarations as asynchronous operations. Its documentation and internal examples were updated. Tests cover asynchronous resource declarations, async generators, for await using...of loops, and an invalid async function using using. A patch changeset records the fix.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the primary change: treating `await using` as an async operation in `useAwait`.
Description check	✅ Passed	The description directly explains the `useAwait` fix, regression tests, and documentation updates.
Linked Issues check	✅ Passed	The implementation, tests, and documentation address issue `#11250` by recognising `await using` in async functions and generators.
Out of Scope Changes check	✅ Passed	All reviewed changes support the linked issue through rule logic, regression tests, documentation, and a changeset.

✨ Finishing Touches

🧪 Generate unit tests (beta)

Create PR with unit tests

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

_{Comment @coderabbitai help to get the list of available commands.}

codspeed · 2026-08-06T07:23:15Z

Merging this PR will degrade performance by 15.09%

❌ 1 regressed benchmark
✅ 61 untouched benchmarks
⏩ 222 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	`BASE`	`HEAD`	Efficiency
❌	`js_analyzer[index_3894593175024091846.js]`	73.4 ms	86.5 ms	-15.09%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

_{Comparing Turtle-Hwan:fix/11250-await-using (0537681) with main (bd0b68d)}

222 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. ↩

@const

This PR contains the following updates: | Package | Type | Update | Change | Pending | |---|---|---|---|---| | [@biomejs/biome](https://biomejs.dev) ([source](https://github.com/biomejs/biome/tree/HEAD/packages/@biomejs/biome)) | imports | patch | [`2.5.7` -> `2.5.8`](https://renovatebot.com/diffs/npm/@biomejs%2fbiome/2.5.7/2.5.8) | `2.5.9` | --- ### Release Notes <details> <summary>biomejs/biome (@biomejs/biome)</summary> ### [`v2.5.8`](https://github.com/biomejs/biome/blob/HEAD/packages/@biomejs/biome/CHANGELOG.md#258) [Compare Source](https://github.com/biomejs/biome/compare/@biomejs/biome@2.5.7...@biomejs/biome@2.5.8) ##### Patch Changes - [#10710](biomejs/biome#10710) [`0a0fbc1`](biomejs/biome@0a0fbc1) Thanks [@dyc3](https://github.com/dyc3)! - Added a new nursery rule [`useReactCompiler`](https://biomejs.dev/linter/rules/use-react-compiler/), which reports diagnostics from React Compiler lint mode. - [#11251](biomejs/biome#11251) [`ea9dd8a`](biomejs/biome@ea9dd8a) Thanks [@dyc3](https://github.com/dyc3)! - Improved performance of [`noImportCycles`](https://biomejs.dev/linter/rules/no-import-cycles/). - [#11247](biomejs/biome#11247) [`52b44d6`](biomejs/biome@52b44d6) Thanks [@dyc3](https://github.com/dyc3)! - Added the nursery rule [`noSvelteLegacyConst`](https://biomejs.dev/linter/rules/no-svelte-legacy-const/), which disallows legacy Svelte `{@const}` tags and recommends declaration tags with `$derived()`. Invalid: ```svelte {#each boxes as box} {@const area = box.width * box.height} <p>{area}</p> {/each} ``` Valid: ```svelte {#each boxes as box} {const area = $derived(box.width * box.height)} <p>{area}</p> {/each} ``` - [#11252](biomejs/biome#11252) [`d5f5704`](biomejs/biome@d5f5704) Thanks [@Turtle-Hwan](https://github.com/Turtle-Hwan)! - Fixed [#11250](biomejs/biome#11250): [`useAwait`](https://biomejs.dev/linter/rules/use-await/) no longer reports async functions that contain an `await using` declaration. - [#11143](biomejs/biome#11143) [`6be7be1`](biomejs/biome@6be7be1) Thanks [@vznh](https://github.com/vznh)! - Fixed [#11017](biomejs/biome#11017): [`noUselessUndefined`](https://biomejs.dev/linter/rules/no-useless-undefined/) no longer reports `return undefined` when the enclosing function has a return type annotation other than `undefined` or `void`. - [#11234](biomejs/biome#11234) [`caefe39`](biomejs/biome@caefe39) Thanks [@subotac](https://github.com/subotac)! - Fixed [#11228](biomejs/biome#11228): CSS block comments between a declaration colon and value now preserve their source indentation. ```diff :root { --font-stack: -/* comment */ + /* comment */ system-ui; } ``` - [#11285](biomejs/biome#11285) [`bca1f73`](biomejs/biome@bca1f73) Thanks [@denbezrukov](https://github.com/denbezrukov)! - Fixed [#11280](biomejs/biome#11280): CSS formatting keeps comments inside functional pseudo-classes and pseudo-elements instead of moving them before the function name. ```diff -:/* comment */ where(div) {} +:where(/* comment */ div) {} ``` - [#11080](biomejs/biome#11080) [`af16a0b`](biomejs/biome@af16a0b) Thanks [@dyc3](https://github.com/dyc3)! - HTML `style` attribute values are now parsed as CSS. All Biome CSS lint rules are applied to the `style` attributes. - [#11195](biomejs/biome#11195) [`6a85588`](biomejs/biome@6a85588) Thanks [@dyc3](https://github.com/dyc3)! - Fixed Svelte files failing to parse when an expression begins with an object literal. Now the following snippet is correctly parsed: ```svelte <p>{{ a: true }}</p> <div class={{ active: isActive }}></div> ``` - [#11173](biomejs/biome#11173) [`481d008`](biomejs/biome@481d008) Thanks [@Austin1serb](https://github.com/Austin1serb)! - Fixed [#10242](biomejs/biome#10242): JavaScript GritQL patterns with multiple metavariables now match snippets consistently in WebAssembly. - [#11187](biomejs/biome#11187) [`23c0369`](biomejs/biome@23c0369) Thanks [@ematipico](https://github.com/ematipico)! - Added the nursery rule [`noInvalidPropertyInitValue`](https://biomejs.dev/linter/rules/no-invalid-property-init-value/), which reports an `@property` whose `initial-value` does not match its `syntax` descriptor. For example, the following declaration triggers the rule because `red` is not a `<length>`: ```css @Property --size { syntax: "<length>"; inherits: false; initial-value: red; } ``` - [#11272](biomejs/biome#11272) [`73896e6`](biomejs/biome@73896e6) Thanks [@ematipico](https://github.com/ematipico)! - Improved the diagnostic emitted by [`noRootType`](https://biomejs.dev/linter/rules/no-root-type). - [#11240](biomejs/biome#11240) [`bd0b68d`](biomejs/biome@bd0b68d) Thanks [@ematipico](https://github.com/ematipico)! - Fixed [#11223](biomejs/biome#11223): Improved the performance of [`noMisusedPromises`](https://biomejs.dev/linter/rules/no-misused-promises/) when analyzing async class methods that call other methods through `this`. - [#11172](biomejs/biome#11172) [`4a0bc5c`](biomejs/biome@4a0bc5c) Thanks [@saberoueslati](https://github.com/saberoueslati)! - Fixed [#10806](biomejs/biome#10806): [`noUselessFragments`](https://biomejs.dev/linter/rules/no-useless-fragments/) no longer causes Biome to panic when its unsafe fix removes a fragment used as a JSX attribute value. - [#11227](biomejs/biome#11227) [`4d603b0`](biomejs/biome@4d603b0) Thanks [@saberoueslati](https://github.com/saberoueslati)! - Fixed [#11178](biomejs/biome#11178): [`noUndeclaredVariables`](https://biomejs.dev/linter/rules/no-undeclared-variables/) no longer reports Vue's built-in instance properties, such as `$slots` and `$attrs`, in template expressions or `$event` in inline event-handler expressions. The instance properties are still reported inside `<script setup>`, where they are not defined. - [#11187](biomejs/biome#11187) [`23c0369`](biomejs/biome@23c0369) Thanks [@ematipico](https://github.com/ematipico)! - Fixed CSS parsing of registered custom properties: Biome now correctly validates the `syntax` descriptor of `@property` 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. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate CLI](https://github.com/renovatebot/renovate).  Reviewed-on: https://git.oirnoir.dev/OIRNOIR/YouTube-Helper-Client/pulls/17

@const

This PR contains the following updates: | Package | Type | Update | Change | Pending | |---|---|---|---|---| | [@biomejs/biome](https://biomejs.dev) ([source](https://github.com/biomejs/biome/tree/HEAD/packages/@biomejs/biome)) | imports | patch | [`2.5.7` -> `2.5.8`](https://renovatebot.com/diffs/npm/@biomejs%2fbiome/2.5.7/2.5.8) | `2.5.9` | --- ### Release Notes <details> <summary>biomejs/biome (@biomejs/biome)</summary> ### [`v2.5.8`](https://github.com/biomejs/biome/blob/HEAD/packages/@biomejs/biome/CHANGELOG.md#258) [Compare Source](https://github.com/biomejs/biome/compare/@biomejs/biome@2.5.7...@biomejs/biome@2.5.8) ##### Patch Changes - [#10710](biomejs/biome#10710) [`0a0fbc1`](biomejs/biome@0a0fbc1) Thanks [@dyc3](https://github.com/dyc3)! - Added a new nursery rule [`useReactCompiler`](https://biomejs.dev/linter/rules/use-react-compiler/), which reports diagnostics from React Compiler lint mode. - [#11251](biomejs/biome#11251) [`ea9dd8a`](biomejs/biome@ea9dd8a) Thanks [@dyc3](https://github.com/dyc3)! - Improved performance of [`noImportCycles`](https://biomejs.dev/linter/rules/no-import-cycles/). - [#11247](biomejs/biome#11247) [`52b44d6`](biomejs/biome@52b44d6) Thanks [@dyc3](https://github.com/dyc3)! - Added the nursery rule [`noSvelteLegacyConst`](https://biomejs.dev/linter/rules/no-svelte-legacy-const/), which disallows legacy Svelte `{@const}` tags and recommends declaration tags with `$derived()`. Invalid: ```svelte {#each boxes as box} {@const area = box.width * box.height} <p>{area}</p> {/each} ``` Valid: ```svelte {#each boxes as box} {const area = $derived(box.width * box.height)} <p>{area}</p> {/each} ``` - [#11252](biomejs/biome#11252) [`d5f5704`](biomejs/biome@d5f5704) Thanks [@Turtle-Hwan](https://github.com/Turtle-Hwan)! - Fixed [#11250](biomejs/biome#11250): [`useAwait`](https://biomejs.dev/linter/rules/use-await/) no longer reports async functions that contain an `await using` declaration. - [#11143](biomejs/biome#11143) [`6be7be1`](biomejs/biome@6be7be1) Thanks [@vznh](https://github.com/vznh)! - Fixed [#11017](biomejs/biome#11017): [`noUselessUndefined`](https://biomejs.dev/linter/rules/no-useless-undefined/) no longer reports `return undefined` when the enclosing function has a return type annotation other than `undefined` or `void`. - [#11234](biomejs/biome#11234) [`caefe39`](biomejs/biome@caefe39) Thanks [@subotac](https://github.com/subotac)! - Fixed [#11228](biomejs/biome#11228): CSS block comments between a declaration colon and value now preserve their source indentation. ```diff :root { --font-stack: -/* comment */ + /* comment */ system-ui; } ``` - [#11285](biomejs/biome#11285) [`bca1f73`](biomejs/biome@bca1f73) Thanks [@denbezrukov](https://github.com/denbezrukov)! - Fixed [#11280](biomejs/biome#11280): CSS formatting keeps comments inside functional pseudo-classes and pseudo-elements instead of moving them before the function name. ```diff -:/* comment */ where(div) {} +:where(/* comment */ div) {} ``` - [#11080](biomejs/biome#11080) [`af16a0b`](biomejs/biome@af16a0b) Thanks [@dyc3](https://github.com/dyc3)! - HTML `style` attribute values are now parsed as CSS. All Biome CSS lint rules are applied to the `style` attributes. - [#11195](biomejs/biome#11195) [`6a85588`](biomejs/biome@6a85588) Thanks [@dyc3](https://github.com/dyc3)! - Fixed Svelte files failing to parse when an expression begins with an object literal. Now the following snippet is correctly parsed: ```svelte <p>{{ a: true }}</p> <div class={{ active: isActive }}></div> ``` - [#11173](biomejs/biome#11173) [`481d008`](biomejs/biome@481d008) Thanks [@Austin1serb](https://github.com/Austin1serb)! - Fixed [#10242](biomejs/biome#10242): JavaScript GritQL patterns with multiple metavariables now match snippets consistently in WebAssembly. - [#11187](biomejs/biome#11187) [`23c0369`](biomejs/biome@23c0369) Thanks [@ematipico](https://github.com/ematipico)! - Added the nursery rule [`noInvalidPropertyInitValue`](https://biomejs.dev/linter/rules/no-invalid-property-init-value/), which reports an `@property` whose `initial-value` does not match its `syntax` descriptor. For example, the following declaration triggers the rule because `red` is not a `<length>`: ```css @Property --size { syntax: "<length>"; inherits: false; initial-value: red; } ``` - [#11272](biomejs/biome#11272) [`73896e6`](biomejs/biome@73896e6) Thanks [@ematipico](https://github.com/ematipico)! - Improved the diagnostic emitted by [`noRootType`](https://biomejs.dev/linter/rules/no-root-type). - [#11240](biomejs/biome#11240) [`bd0b68d`](biomejs/biome@bd0b68d) Thanks [@ematipico](https://github.com/ematipico)! - Fixed [#11223](biomejs/biome#11223): Improved the performance of [`noMisusedPromises`](https://biomejs.dev/linter/rules/no-misused-promises/) when analyzing async class methods that call other methods through `this`. - [#11172](biomejs/biome#11172) [`4a0bc5c`](biomejs/biome@4a0bc5c) Thanks [@saberoueslati](https://github.com/saberoueslati)! - Fixed [#10806](biomejs/biome#10806): [`noUselessFragments`](https://biomejs.dev/linter/rules/no-useless-fragments/) no longer causes Biome to panic when its unsafe fix removes a fragment used as a JSX attribute value. - [#11227](biomejs/biome#11227) [`4d603b0`](biomejs/biome@4d603b0) Thanks [@saberoueslati](https://github.com/saberoueslati)! - Fixed [#11178](biomejs/biome#11178): [`noUndeclaredVariables`](https://biomejs.dev/linter/rules/no-undeclared-variables/) no longer reports Vue's built-in instance properties, such as `$slots` and `$attrs`, in template expressions or `$event` in inline event-handler expressions. The instance properties are still reported inside `<script setup>`, where they are not defined. - [#11187](biomejs/biome#11187) [`23c0369`](biomejs/biome@23c0369) Thanks [@ematipico](https://github.com/ematipico)! - Fixed CSS parsing of registered custom properties: Biome now correctly validates the `syntax` descriptor of `@property` 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. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate CLI](https://github.com/renovatebot/renovate).  Reviewed-on: https://git.oirnoir.dev/OIRNOIR/YouTube-Helper-Server/pulls/36

fix(useAwait): treat await using as an async operation

0537681

github-actions Bot added A-Linter Area: linter L-JavaScript Language: JavaScript and super languages labels Aug 6, 2026

dyc3 approved these changes Aug 6, 2026

View reviewed changes

dyc3 merged commit d5f5704 into biomejs:main Aug 6, 2026
33 of 34 checks passed

github-actions Bot mentioned this pull request Aug 6, 2026

ci: release #11236

Merged

Navigation Menu

Uh oh!

fix(useAwait): treat await using as an async operation - #11252

fix(useAwait): treat await using as an async operation#11252
dyc3 merged 1 commit into
biomejs:mainfrom
Turtle-Hwan:fix/11250-await-using

Turtle-Hwan commented Aug 6, 2026

Uh oh!

changeset-bot Bot commented Aug 6, 2026

Uh oh!

github-actions Bot commented Aug 6, 2026

Uh oh!

coderabbitai Bot commented Aug 6, 2026

Uh oh!

codspeed Bot commented Aug 6, 2026

Uh oh!

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

2 participants

Uh oh!

Conversation

Turtle-Hwan commented Aug 6, 2026

Summary

Test Plan

Docs

Uh oh!

changeset-bot Bot commented Aug 6, 2026

🦋 Changeset detected

Uh oh!

github-actions Bot commented Aug 6, 2026

✅ Organic activity

Uh oh!

coderabbitai Bot commented Aug 6, 2026

Walkthrough

Uh oh!

codspeed Bot commented Aug 6, 2026

Merging this PR will degrade performance by 15.09%

Performance Changes

Footnotes

Uh oh!

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

2 participants