fix(noUnusedVariables): handle generic parameters in function overloads by 1678092075 · Pull Request #11407 · biomejs/biome

1678092075 · 2026-08-19T07:07:14Z

Summary

Fixes #11214.

noUnusedVariables incorrectly reported generic type parameters declared in TypeScript function overload signatures.

This change prevents false positives for named, non-default-export function overloads that have an implementation body.

Behavior

After this change:

Generic parameters in overload signatures of named, non-default-export functions with an implementation are no longer reported.
Declaration-only overloads without an implementation are still reported.
Unused generic parameters inside nested function types or callbacks are still reported.

Test Plan

Added:

A valid regression test for function overloads with an implementation.
A negative test for declaration-only overloads.
A negative test for unused generic parameters in nested callback types.

Validation performed:

cargo test -p biome_js_analyze --no-fail-fast
cargo lint
just gen-rules
just gen-configuration
just lint-rules

Docs

A patch changeset is included. No additional documentation changes are required.

AI disclosure

Codex assisted with issue analysis, implementation, and testing. I reviewed the resulting diff and validation results.

changeset-bot · 2026-08-19T07:07:21Z

🦋 Changeset detected

Latest commit: a1844f0

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

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github-actions · 2026-08-19T07:07:34Z

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coderabbitai · 2026-08-19T07:14:52Z

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crates/biome_js_analyze/src/lint/correctness/no_unused_variables.rs

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Walkthrough

The noUnusedVariables rule now recognises type parameters from TypeScript overload signatures when a function implementation exists. It passes the semantic model to the unused-variable fix logic and preserves the existing ambient-context exemption. Regression fixtures cover valid implemented overloads and invalid unused parameters. A patch changeset documents the correction.

Suggested reviewers: dyc3, ematipico, mokto

Merge Risk: ⚪ Minimal · up to a1844

This localized linter fix adjusts handling of generic parameters in function overloads and includes targeted regression coverage; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: handling generic parameters in function overloads for noUnusedVariables.
Description check	✅ Passed	The description is detailed and directly explains the bug fix, expected behaviour, tests, and validation.
Linked Issues check	✅ Passed	The implementation addresses [`#11214`] by suppressing false positives for generic parameters in implemented TypeScript overloads.
Out of Scope Changes check	✅ Passed	The code, regression tests, and patch changeset all support the linked issue and stated pull request objectives.

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Inline comments:
In `@crates/biome_js_analyze/src/lint/correctness/no_unused_variables.rs`:
- Around line 553-555: Update the contract comment associated with the condition
in is_in_ambient_context and is_implemented_overload_type_parameter to state
that type parameters are exempt both in ambient contexts and in implemented
overload signatures; leave the condition logic unchanged.

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.changeset/honest-terms-design.md
crates/biome_js_analyze/src/lint/correctness/no_unused_variables.rs
crates/biome_js_analyze/tests/specs/correctness/noUnusedVariables/invalidOverloadTypeParam.ts
crates/biome_js_analyze/tests/specs/correctness/noUnusedVariables/validOverloadTypeParam.ts

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codspeed · 2026-08-19T07:25:36Z

Merging this PR will not alter performance

✅ 72 untouched benchmarks
⏩ 233 skipped benchmarks¹

_{Comparing 1678092075:fix/unused-overload-type-parameters (a1844f0) with main (6b502c1)}

233 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. ↩

@click

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 | [`2.5.10` -> `2.5.11`](https://renovatebot.com/diffs/npm/@biomejs%2fbiome/2.5.10/2.5.11) | `2.5.12` | --- ### Release Notes <details> <summary>biomejs/biome (@biomejs/biome)</summary> ### [`v2.5.11`](https://github.com/biomejs/biome/blob/HEAD/packages/@biomejs/biome/CHANGELOG.md#2511) [Compare Source](https://github.com/biomejs/biome/compare/@biomejs/biome@2.5.10...@biomejs/biome@2.5.11) ##### Patch Changes - [#11499](biomejs/biome#11499) [`9743d0c`](biomejs/biome@9743d0c) Thanks [@scs0209](https://github.com/scs0209)! - Fixed [#11496](biomejs/biome#11496): [`useValidAnchor`](https://biomejs.dev/linter/rules/use-valid-anchor/) now treats Astro JSX shorthand attributes like `<a {href}>` as a valid `href`. - [#11437](biomejs/biome#11437) [`88f805e`](biomejs/biome@88f805e) Thanks [@Princesseuh](https://github.com/Princesseuh)! - Fixed [#9944](biomejs/biome#9944): adjacent elements inside an Astro expression now parse as an implicit fragment instead of raising an error. ```astro {options.map(() => <div /> <div /> )} ``` - [#11437](biomejs/biome#11437) [`88f805e`](biomejs/biome@88f805e) Thanks [@Princesseuh](https://github.com/Princesseuh)! - Fixed Astro templates rejecting unclosed HTML void elements, such as `{cond && <br>}`. - [#11507](biomejs/biome#11507) [`e2fc036`](biomejs/biome@e2fc036) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [#11157](biomejs/biome#11157): [`noUnusedVariables`](https://biomejs.dev/linter/rules/no-unused-variables/) no longer reports Vue `<script setup>` bindings used by CSS `v-bind()` as unused. - [#11398](biomejs/biome#11398) [`afc4615`](biomejs/biome@afc4615) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [#11389](biomejs/biome#11389): Files passed through `--stdin-file-path` now use full HTML support for Astro, Svelte, and Vue when it is enabled. - [#11526](biomejs/biome#11526) [`372cd68`](biomejs/biome@372cd68) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [`noVueRefAsOperand`](https://biomejs.dev/linter/rules/no-vue-ref-as-operand/) to track Vue refs through declaration aliases and `toRefs()` properties, and to recognize `useTemplateRef()` results. The rule no longer reports false positives such as plain ref transfers, plain `toRefs()` property access, `defineModel()` modifiers, or the supported `.effect` member as operands. The refactor enabling these fixes also improves the performance of the rule. - [#11458](biomejs/biome#11458) [`a7cd286`](biomejs/biome@a7cd286) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [#11436](biomejs/biome#11436): GritQL snippets such as `export { $specifiers } from $source` now match named re-exports with aliases, inline `type` modifiers, and multiple specifiers. - [#11515](biomejs/biome#11515) [`382b15d`](biomejs/biome@382b15d) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [#11390](biomejs/biome#11390), where `noFloatingPromises` performed expensive full type inference for calls to non-Promise methods declared on third-party TypeScript classes. The rule now classifies those calls using targeted type information. - [#11516](biomejs/biome#11516) [`6f40e82`](biomejs/biome@6f40e82) Thanks [@levrik](https://github.com/levrik)! - Fixed [`noVueRefAsOperand`](https://biomejs.dev/linter/rules/no-vue-ref-as-operand/) so it no longer reports a callback parameter (e.g. from `.find()`, `.map()`) as an unwrapped ref value just because it's nested inside a `ref()`, `computed()`, or similar call. ```js const result = computed(() => list.find((item) => item.label === "a")); ``` Previously, `item` here was incorrectly treated as a ref value because the rule attributed it to the outer `computed()` call. - [#11495](biomejs/biome#11495) [`496268d`](biomejs/biome@496268d) Thanks [@Netail](https://github.com/Netail)! - Fixed [`useGraphqlNamingConvention`](https://biomejs.dev/linter/rules/use-graphql-naming-convention/) so it no longer reports GraphQL enum value definitions with comments & descriptions and now displays a more accurate diagnostic range. - [#11407](biomejs/biome#11407) [`6ef52b0`](biomejs/biome@6ef52b0) Thanks [@1678092075](https://github.com/1678092075)! - Fixed [#11214](biomejs/biome#11214): [`noUnusedVariables`](https://biomejs.dev/linter/rules/no-unused-variables/) no longer reports type parameters declared by non-default function overload signatures that have an implementation. - [#11322](biomejs/biome#11322) [`5c353e6`](biomejs/biome@5c353e6) Thanks [@jp-knj](https://github.com/jp-knj)! - Added a new nursery rule `noAstroSetHtmlDirective`, which disallows Astro's `set:html` directive because untrusted content can introduce cross-site scripting vulnerabilities. For example, the following snippet triggers the rule: ```astro <div set:html={content} /> ``` - [#11462](biomejs/biome#11462) [`18883b7`](biomejs/biome@18883b7) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [#10776](biomejs/biome#10776): [`useVueHyphenatedAttributes`](https://biomejs.dev/linter/rules/use-vue-hyphenated-attributes/) no longer reports lowercase attribute names containing punctuation, such as `pt:header:data-test-id` and `some_attr`. - [#11476](biomejs/biome#11476) [`3270ca4`](biomejs/biome@3270ca4) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [#10330](biomejs/biome#10330): Vue interpolation delimiters now stay attached to whitespace-sensitive element boundaries and adjacent inline siblings, wrapping their expression when needed to fit the configured line width. Interpolations followed by text now also converge after one formatting pass. ```diff -<v-btn v-if="store.state.user" variant="text" to="/my-rooms" - >{{ $t("nav.my-rooms") }}</v-btn -> +<v-btn v-if="store.state.user" variant="text" to="/my-rooms">{{ + $t("nav.my-rooms") +}}</v-btn> ``` - [#11191](biomejs/biome#11191) [`3e5367f`](biomejs/biome@3e5367f) Thanks [@ematipico](https://github.com/ematipico)! - Added the nursery rule [`noUndeclaredCustomProperties`](https://biomejs.dev/linter/rules/no-undeclared-custom-properties/), which reports references to custom properties that are not defined in available CSS, static HTML-like `style` attributes, or JSX string `style` attributes. For example, the following snippet triggers the rule: ```css a { color: var(--undefined-color); } ``` - [#11435](biomejs/biome#11435) [`7754894`](biomejs/biome@7754894) Thanks [@levrik](https://github.com/levrik)! - Fixed: Variables and imports used as custom Vue directives are no longer reported as unused. For example: ```vue <script setup> const vHighlight = { mounted: (element) => { element.style.color = "red"; }, }; </script> <template> <p v-highlight>Hello</p> </template> ``` - [#11501](biomejs/biome#11501) [`e6acded`](biomejs/biome@e6acded) Thanks [@aminya](https://github.com/aminya)! - Improved the performance of [`useArraySortCompare`](https://biomejs.dev/linter/rules/use-array-sort-compare/) by skipping type inference for calls to unrelated methods. - [#11467](biomejs/biome#11467) [`66b282c`](biomejs/biome@66b282c) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [#11464](biomejs/biome#11464): Biome now parses parenthesized object literals returned from arrow functions when they contain a conditional expression and a nested arrow function. - [#11456](biomejs/biome#11456) [`db9aa2a`](biomejs/biome@db9aa2a) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [#10278](biomejs/biome#10278): Marked the fix for [`noThisInStatic`](https://biomejs.dev/linter/rules/no-this-in-static/) as unsafe by default. - [#11502](biomejs/biome#11502) [`652aedb`](biomejs/biome@652aedb) Thanks [@levrik](https://github.com/levrik)! - `noGlobalAssign` no longer reports assignments to a Vue `<script setup>` binding from a template expression, when the binding's name happens to match a built-in global (e.g. `open`, `parent`, `top`). For example, this no longer triggers a diagnostic: ```vue <script setup> const open = defineModel(); </script> <template> <button @click="open = !open">Toggle</button> </template> ``` </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/20

@click

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 | [`2.5.10` -> `2.5.11`](https://renovatebot.com/diffs/npm/@biomejs%2fbiome/2.5.10/2.5.11) | `2.5.12` | --- ### Release Notes <details> <summary>biomejs/biome (@biomejs/biome)</summary> ### [`v2.5.11`](https://github.com/biomejs/biome/blob/HEAD/packages/@biomejs/biome/CHANGELOG.md#2511) [Compare Source](https://github.com/biomejs/biome/compare/@biomejs/biome@2.5.10...@biomejs/biome@2.5.11) ##### Patch Changes - [#11499](biomejs/biome#11499) [`9743d0c`](biomejs/biome@9743d0c) Thanks [@scs0209](https://github.com/scs0209)! - Fixed [#11496](biomejs/biome#11496): [`useValidAnchor`](https://biomejs.dev/linter/rules/use-valid-anchor/) now treats Astro JSX shorthand attributes like `<a {href}>` as a valid `href`. - [#11437](biomejs/biome#11437) [`88f805e`](biomejs/biome@88f805e) Thanks [@Princesseuh](https://github.com/Princesseuh)! - Fixed [#9944](biomejs/biome#9944): adjacent elements inside an Astro expression now parse as an implicit fragment instead of raising an error. ```astro {options.map(() => <div /> <div /> )} ``` - [#11437](biomejs/biome#11437) [`88f805e`](biomejs/biome@88f805e) Thanks [@Princesseuh](https://github.com/Princesseuh)! - Fixed Astro templates rejecting unclosed HTML void elements, such as `{cond && <br>}`. - [#11507](biomejs/biome#11507) [`e2fc036`](biomejs/biome@e2fc036) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [#11157](biomejs/biome#11157): [`noUnusedVariables`](https://biomejs.dev/linter/rules/no-unused-variables/) no longer reports Vue `<script setup>` bindings used by CSS `v-bind()` as unused. - [#11398](biomejs/biome#11398) [`afc4615`](biomejs/biome@afc4615) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [#11389](biomejs/biome#11389): Files passed through `--stdin-file-path` now use full HTML support for Astro, Svelte, and Vue when it is enabled. - [#11526](biomejs/biome#11526) [`372cd68`](biomejs/biome@372cd68) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [`noVueRefAsOperand`](https://biomejs.dev/linter/rules/no-vue-ref-as-operand/) to track Vue refs through declaration aliases and `toRefs()` properties, and to recognize `useTemplateRef()` results. The rule no longer reports false positives such as plain ref transfers, plain `toRefs()` property access, `defineModel()` modifiers, or the supported `.effect` member as operands. The refactor enabling these fixes also improves the performance of the rule. - [#11458](biomejs/biome#11458) [`a7cd286`](biomejs/biome@a7cd286) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [#11436](biomejs/biome#11436): GritQL snippets such as `export { $specifiers } from $source` now match named re-exports with aliases, inline `type` modifiers, and multiple specifiers. - [#11515](biomejs/biome#11515) [`382b15d`](biomejs/biome@382b15d) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [#11390](biomejs/biome#11390), where `noFloatingPromises` performed expensive full type inference for calls to non-Promise methods declared on third-party TypeScript classes. The rule now classifies those calls using targeted type information. - [#11516](biomejs/biome#11516) [`6f40e82`](biomejs/biome@6f40e82) Thanks [@levrik](https://github.com/levrik)! - Fixed [`noVueRefAsOperand`](https://biomejs.dev/linter/rules/no-vue-ref-as-operand/) so it no longer reports a callback parameter (e.g. from `.find()`, `.map()`) as an unwrapped ref value just because it's nested inside a `ref()`, `computed()`, or similar call. ```js const result = computed(() => list.find((item) => item.label === "a")); ``` Previously, `item` here was incorrectly treated as a ref value because the rule attributed it to the outer `computed()` call. - [#11495](biomejs/biome#11495) [`496268d`](biomejs/biome@496268d) Thanks [@Netail](https://github.com/Netail)! - Fixed [`useGraphqlNamingConvention`](https://biomejs.dev/linter/rules/use-graphql-naming-convention/) so it no longer reports GraphQL enum value definitions with comments & descriptions and now displays a more accurate diagnostic range. - [#11407](biomejs/biome#11407) [`6ef52b0`](biomejs/biome@6ef52b0) Thanks [@1678092075](https://github.com/1678092075)! - Fixed [#11214](biomejs/biome#11214): [`noUnusedVariables`](https://biomejs.dev/linter/rules/no-unused-variables/) no longer reports type parameters declared by non-default function overload signatures that have an implementation. - [#11322](biomejs/biome#11322) [`5c353e6`](biomejs/biome@5c353e6) Thanks [@jp-knj](https://github.com/jp-knj)! - Added a new nursery rule `noAstroSetHtmlDirective`, which disallows Astro's `set:html` directive because untrusted content can introduce cross-site scripting vulnerabilities. For example, the following snippet triggers the rule: ```astro <div set:html={content} /> ``` - [#11462](biomejs/biome#11462) [`18883b7`](biomejs/biome@18883b7) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [#10776](biomejs/biome#10776): [`useVueHyphenatedAttributes`](https://biomejs.dev/linter/rules/use-vue-hyphenated-attributes/) no longer reports lowercase attribute names containing punctuation, such as `pt:header:data-test-id` and `some_attr`. - [#11476](biomejs/biome#11476) [`3270ca4`](biomejs/biome@3270ca4) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [#10330](biomejs/biome#10330): Vue interpolation delimiters now stay attached to whitespace-sensitive element boundaries and adjacent inline siblings, wrapping their expression when needed to fit the configured line width. Interpolations followed by text now also converge after one formatting pass. ```diff -<v-btn v-if="store.state.user" variant="text" to="/my-rooms" - >{{ $t("nav.my-rooms") }}</v-btn -> +<v-btn v-if="store.state.user" variant="text" to="/my-rooms">{{ + $t("nav.my-rooms") +}}</v-btn> ``` - [#11191](biomejs/biome#11191) [`3e5367f`](biomejs/biome@3e5367f) Thanks [@ematipico](https://github.com/ematipico)! - Added the nursery rule [`noUndeclaredCustomProperties`](https://biomejs.dev/linter/rules/no-undeclared-custom-properties/), which reports references to custom properties that are not defined in available CSS, static HTML-like `style` attributes, or JSX string `style` attributes. For example, the following snippet triggers the rule: ```css a { color: var(--undefined-color); } ``` - [#11435](biomejs/biome#11435) [`7754894`](biomejs/biome@7754894) Thanks [@levrik](https://github.com/levrik)! - Fixed: Variables and imports used as custom Vue directives are no longer reported as unused. For example: ```vue <script setup> const vHighlight = { mounted: (element) => { element.style.color = "red"; }, }; </script> <template> <p v-highlight>Hello</p> </template> ``` - [#11501](biomejs/biome#11501) [`e6acded`](biomejs/biome@e6acded) Thanks [@aminya](https://github.com/aminya)! - Improved the performance of [`useArraySortCompare`](https://biomejs.dev/linter/rules/use-array-sort-compare/) by skipping type inference for calls to unrelated methods. - [#11467](biomejs/biome#11467) [`66b282c`](biomejs/biome@66b282c) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [#11464](biomejs/biome#11464): Biome now parses parenthesized object literals returned from arrow functions when they contain a conditional expression and a nested arrow function. - [#11456](biomejs/biome#11456) [`db9aa2a`](biomejs/biome@db9aa2a) Thanks [@dyc3](https://github.com/dyc3)! - Fixed [#10278](biomejs/biome#10278): Marked the fix for [`noThisInStatic`](https://biomejs.dev/linter/rules/no-this-in-static/) as unsafe by default. - [#11502](biomejs/biome#11502) [`652aedb`](biomejs/biome@652aedb) Thanks [@levrik](https://github.com/levrik)! - `noGlobalAssign` no longer reports assignments to a Vue `<script setup>` binding from a template expression, when the binding's name happens to match a built-in global (e.g. `open`, `parent`, `top`). For example, this no longer triggers a diagnostic: ```vue <script setup> const open = defineModel(); </script> <template> <button @click="open = !open">Toggle</button> </template> ``` </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/42

fix(noUnusedVariables): ignore implemented overload type parameters

3183cd0

github-actions Bot added A-Linter Area: linter L-JavaScript Language: JavaScript and super languages labels Aug 19, 2026

coderabbitai Bot reviewed Aug 19, 2026

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Comment thread crates/biome_js_analyze/src/lint/correctness/no_unused_variables.rs

docs(noUnusedVariables): clarify type parameter exemptions

a1844f0

ematipico approved these changes Aug 24, 2026

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ematipico merged commit 6ef52b0 into biomejs:main Aug 24, 2026
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github-actions Bot mentioned this pull request Aug 24, 2026

ci: release #11457

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fix(noUnusedVariables): handle generic parameters in function overloads - #11407

fix(noUnusedVariables): handle generic parameters in function overloads#11407
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1678092075:fix/unused-overload-type-parameters

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codspeed Bot commented Aug 19, 2026 •

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1678092075 commented Aug 19, 2026

Summary

Behavior

Test Plan

Docs

AI disclosure

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🦋 Changeset detected

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github-actions Bot commented Aug 19, 2026

✅ Organic activity

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Walkthrough

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codspeed Bot commented Aug 19, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Merging this PR will not alter performance

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