feat(eslint-plugin): [no-misused-promises] detect async usage of a sync dispose usage by KristjanTammekivi · Pull Request #12426 · typescript-eslint/typescript-eslint

KristjanTammekivi · 2026-06-15T09:22:05Z

closes

PR Checklist

Addresses an existing open issue: fixes Enhancement: [no-misused-promises] should include checks around synchronous using statements and Symbol.dispose. #10357
That issue was marked as accepting prs
Steps in Contributing were taken

Overview

Detect returning Promise from a synchronous dispose function

closes 10357

typescript-eslint · 2026-06-15T09:22:10Z

Thanks for the PR, @KristjanTammekivi!

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nx-cloud · 2026-06-15T09:23:27Z

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codecov · 2026-06-15T09:26:34Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.71%. Comparing base (565e666) to head (e8444c3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12426   +/-   ##
=======================================
  Coverage   94.70%   94.71%           
=======================================
  Files         222      222           
  Lines       11376    11394   +18     
  Branches     3789     3795    +6     
=======================================
+ Hits        10774    10792   +18     
  Misses        256      256           
  Partials      346      346

Flag	Coverage Δ
unittest	`94.71% <100.00%> (+<0.01%)`	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ges/eslint-plugin/src/rules/no-misused-promises.ts	`97.18% <100.00%> (+0.19%)`	⬆️

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…se side

JoshuaKGoldberg

💯 thanks!

JoshuaKGoldberg · 2026-07-06T16:24:15Z

  );
 }
+
+function hasWellKnownSymbolWithThenableReturn(


[Refactor] This is almost at my level of wanting to request a DRY. But 🤷 it's just two... IMO this is fine for now.

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| datasource | package | from | to | | ---------- | -------------------------------- | ------ | ------ | | npm | @typescript-eslint/eslint-plugin | 8.61.0 | 8.65.0 | | npm | @typescript-eslint/parser | 8.61.0 | 8.65.0 | ## [v8.65.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8650-2026-07-20) ##### 🚀 Features - **eslint-plugin:** \[no-shadow] specialized error on enum declaration and member shadowing ([#12578](typescript-eslint/typescript-eslint#12578)) - add warning when TS 7 is detected ([#12529](typescript-eslint/typescript-eslint#12529)) - **eslint-plugin:** \[no-restricted-imports] deprecate extension rule ([#12527](typescript-eslint/typescript-eslint#12527), [#19562](https://github.com/typescript-eslint/typescript-eslint/issues/19562), [#11889](typescript-eslint/typescript-eslint#11889)) ##### 🩹 Fixes - **eslint-plugin:** \[no-unnecessary-parameter-property-assignment] don't flag computed assignments with a variable key ([#12568](typescript-eslint/typescript-eslint#12568)) - **eslint-plugin:** \[unbound-method] report unbound methods accessed via member expression on union types ([#12448](typescript-eslint/typescript-eslint#12448)) - **eslint-plugin:** \[prefer-string-starts-ends-with] handle escaped $ ending regex literals ([#12515](typescript-eslint/typescript-eslint#12515)) ##### ❤️ Thank You - Evyatar Daud [@StyleShit](https://github.com/StyleShit) - Josh Goldberg ✨ - Kirk Waiblinger [@kirkwaiblinger](https://github.com/kirkwaiblinger) - Serhii Leniv [@Serhii-Leniv](https://github.com/Serhii-Leniv) - 송재욱 See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.65.0) for more information. You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.64.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8640-2026-07-13) ##### 🚀 Features - **eslint-plugin:** \[no-loop-func] support `using` / `await using` declarations and deprecate the rule ([#12500](typescript-eslint/typescript-eslint#12500)) - **typescript-estree:** throw for invalid definite assignment in class properties ([#12543](typescript-eslint/typescript-eslint#12543)) ##### 🩹 Fixes - **eslint-plugin:** \[require-array-sort-compare] handle constrained arrays ([#12512](typescript-eslint/typescript-eslint#12512)) ##### ❤️ Thank You - Evyatar Daud [@StyleShit](https://github.com/StyleShit) - 송재욱 See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.64.0) for more information. You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.63.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8630-2026-07-06) ##### 🚀 Features - **eslint-plugin:** \[no-misused-promises] detect async usage of a sync dispose usage ([#12426](typescript-eslint/typescript-eslint#12426)) ##### 🩹 Fixes - **eslint-plugin:** \[no-base-to-string] don't flag a shadowed String() call ([#12492](typescript-eslint/typescript-eslint#12492)) - **eslint-plugin:** \[no-unnecessary-type-assertion] handle optional-chained calls to overloaded functions ([#12491](typescript-eslint/typescript-eslint#12491), [#12485](typescript-eslint/typescript-eslint#12485)) - **eslint-plugin:** \[method-signature-style] suggest converting readonly function properties instead of emitting invalid syntax ([#12447](typescript-eslint/typescript-eslint#12447), [#12446](typescript-eslint/typescript-eslint#12446)) ##### ❤️ Thank You - Evyatar Daud [@StyleShit](https://github.com/StyleShit) - Kristjan [@KristjanTammekivi](https://github.com/KristjanTammekivi) - Michael Naumov [@mnaoumov](https://github.com/mnaoumov) - Serhii Leniv [@Serhii-Leniv](https://github.com/Serhii-Leniv) - 송재욱 See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.63.0) for more information. You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.62.1](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8621-2026-06-29) ##### 🩹 Fixes - **eslint-plugin:** \[no-unnecessary-type-assertion] parenthesize object literal at left edge of expression statement ([#12443](typescript-eslint/typescript-eslint#12443), [#12418](typescript-eslint/typescript-eslint#12418)) - **eslint-plugin:** \[no-unnecessary-boolean-literal-compare] preserve boolean result in fixer for nullable true comparisons ([#12365](typescript-eslint/typescript-eslint#12365)) - **eslint-plugin:** \[prefer-optional-chain] use suggestion instead of autofix for trailing binary operator ([#12328](typescript-eslint/typescript-eslint#12328)) ##### ❤️ Thank You - Kirk Waiblinger [@kirkwaiblinger](https://github.com/kirkwaiblinger) - mdm317 - Patrick Aleite - 송재욱 See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.62.1) for more information. You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.62.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8620-2026-06-22) ##### 🚀 Features - remove redundant package.json "files" ([#12444](typescript-eslint/typescript-eslint#12444)) ##### ❤️ Thank You - Kirk Waiblinger [@kirkwaiblinger](https://github.com/kirkwaiblinger) See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.62.0) for more information. You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.61.1](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8611-2026-06-15) ##### 🩹 Fixes - **eslint-plugin:** \[no-unnecessary-template-expression] respect ECMAScript line terminators ([#12388](typescript-eslint/typescript-eslint#12388)) - **eslint-plugin:** \[no-unnecessary-boolean-literal-compare] fix precedence bug in autofix ([#12413](typescript-eslint/typescript-eslint#12413)) - **eslint-plugin:** \[no-unnecessary-type-assertion] wrap object literal in parens when removing TSTypeAssertion in arrow body ([#12394](typescript-eslint/typescript-eslint#12394), [#12393](typescript-eslint/typescript-eslint#12393)) - **eslint-plugin:** \[no-unnecessary-type-assertion] avoid false positive for template literal expressions ([#12281](typescript-eslint/typescript-eslint#12281)) - **eslint-plugin:** \[consistent-indexed-object-style] do not remove comments when fixing ([#12396](typescript-eslint/typescript-eslint#12396), [#10577](typescript-eslint/typescript-eslint#10577)) ##### ❤️ Thank You - Anas [@anasm266](https://github.com/anasm266) - Deftera [@Deftera186](https://github.com/Deftera186) - Kirk Waiblinger [@kirkwaiblinger](https://github.com/kirkwaiblinger) - lumir - Sarath Francis [@sarathfrancis90](https://github.com/sarathfrancis90) See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.61.1) for more information. You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website.

@StyleShit

| datasource | package | from | to | | ---------- | -------------------------------- | ------ | ------ | | npm | @typescript-eslint/eslint-plugin | 8.61.0 | 8.65.0 | | npm | @typescript-eslint/parser | 8.61.0 | 8.65.0 | ## [v8.65.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8650-2026-07-20) ##### 🚀 Features - **eslint-plugin:** \[no-shadow] specialized error on enum declaration and member shadowing ([#12578](typescript-eslint/typescript-eslint#12578)) - add warning when TS 7 is detected ([#12529](typescript-eslint/typescript-eslint#12529)) - **eslint-plugin:** \[no-restricted-imports] deprecate extension rule ([#12527](typescript-eslint/typescript-eslint#12527), [#19562](https://github.com/typescript-eslint/typescript-eslint/issues/19562), [#11889](typescript-eslint/typescript-eslint#11889)) ##### 🩹 Fixes - **eslint-plugin:** \[no-unnecessary-parameter-property-assignment] don't flag computed assignments with a variable key ([#12568](typescript-eslint/typescript-eslint#12568)) - **eslint-plugin:** \[unbound-method] report unbound methods accessed via member expression on union types ([#12448](typescript-eslint/typescript-eslint#12448)) - **eslint-plugin:** \[prefer-string-starts-ends-with] handle escaped $ ending regex literals ([#12515](typescript-eslint/typescript-eslint#12515)) ##### ❤️ Thank You - Evyatar Daud [@StyleShit](https://github.com/StyleShit) - Josh Goldberg ✨ - Kirk Waiblinger [@kirkwaiblinger](https://github.com/kirkwaiblinger) - Serhii Leniv [@Serhii-Leniv](https://github.com/Serhii-Leniv) - 송재욱 See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.65.0) for more information. You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.64.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8640-2026-07-13) ##### 🚀 Features - **eslint-plugin:** \[no-loop-func] support `using` / `await using` declarations and deprecate the rule ([#12500](typescript-eslint/typescript-eslint#12500)) - **typescript-estree:** throw for invalid definite assignment in class properties ([#12543](typescript-eslint/typescript-eslint#12543)) ##### 🩹 Fixes - **eslint-plugin:** \[require-array-sort-compare] handle constrained arrays ([#12512](typescript-eslint/typescript-eslint#12512)) ##### ❤️ Thank You - Evyatar Daud [@StyleShit](https://github.com/StyleShit) - 송재욱 See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.64.0) for more information. You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.63.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8630-2026-07-06) ##### 🚀 Features - **eslint-plugin:** \[no-misused-promises] detect async usage of a sync dispose usage ([#12426](typescript-eslint/typescript-eslint#12426)) ##### 🩹 Fixes - **eslint-plugin:** \[no-base-to-string] don't flag a shadowed String() call ([#12492](typescript-eslint/typescript-eslint#12492)) - **eslint-plugin:** \[no-unnecessary-type-assertion] handle optional-chained calls to overloaded functions ([#12491](typescript-eslint/typescript-eslint#12491), [#12485](typescript-eslint/typescript-eslint#12485)) - **eslint-plugin:** \[method-signature-style] suggest converting readonly function properties instead of emitting invalid syntax ([#12447](typescript-eslint/typescript-eslint#12447), [#12446](typescript-eslint/typescript-eslint#12446)) ##### ❤️ Thank You - Evyatar Daud [@StyleShit](https://github.com/StyleShit) - Kristjan [@KristjanTammekivi](https://github.com/KristjanTammekivi) - Michael Naumov [@mnaoumov](https://github.com/mnaoumov) - Serhii Leniv [@Serhii-Leniv](https://github.com/Serhii-Leniv) - 송재욱 See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.63.0) for more information. You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.62.1](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8621-2026-06-29) ##### 🩹 Fixes - **eslint-plugin:** \[no-unnecessary-type-assertion] parenthesize object literal at left edge of expression statement ([#12443](typescript-eslint/typescript-eslint#12443), [#12418](typescript-eslint/typescript-eslint#12418)) - **eslint-plugin:** \[no-unnecessary-boolean-literal-compare] preserve boolean result in fixer for nullable true comparisons ([#12365](typescript-eslint/typescript-eslint#12365)) - **eslint-plugin:** \[prefer-optional-chain] use suggestion instead of autofix for trailing binary operator ([#12328](typescript-eslint/typescript-eslint#12328)) ##### ❤️ Thank You - Kirk Waiblinger [@kirkwaiblinger](https://github.com/kirkwaiblinger) - mdm317 - Patrick Aleite - 송재욱 See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.62.1) for more information. You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.62.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8620-2026-06-22) ##### 🚀 Features - remove redundant package.json "files" ([#12444](typescript-eslint/typescript-eslint#12444)) ##### ❤️ Thank You - Kirk Waiblinger [@kirkwaiblinger](https://github.com/kirkwaiblinger) See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.62.0) for more information. You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.61.1](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8611-2026-06-15) ##### 🩹 Fixes - **eslint-plugin:** \[no-unnecessary-template-expression] respect ECMAScript line terminators ([#12388](typescript-eslint/typescript-eslint#12388)) - **eslint-plugin:** \[no-unnecessary-boolean-literal-compare] fix precedence bug in autofix ([#12413](typescript-eslint/typescript-eslint#12413)) - **eslint-plugin:** \[no-unnecessary-type-assertion] wrap object literal in parens when removing TSTypeAssertion in arrow body ([#12394](typescript-eslint/typescript-eslint#12394), [#12393](typescript-eslint/typescript-eslint#12393)) - **eslint-plugin:** \[no-unnecessary-type-assertion] avoid false positive for template literal expressions ([#12281](typescript-eslint/typescript-eslint#12281)) - **eslint-plugin:** \[consistent-indexed-object-style] do not remove comments when fixing ([#12396](typescript-eslint/typescript-eslint#12396), [#10577](typescript-eslint/typescript-eslint#10577)) ##### ❤️ Thank You - Anas [@anasm266](https://github.com/anasm266) - Deftera [@Deftera186](https://github.com/Deftera186) - Kirk Waiblinger [@kirkwaiblinger](https://github.com/kirkwaiblinger) - lumir - Sarath Francis [@sarathfrancis90](https://github.com/sarathfrancis90) See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.61.1) for more information. You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website.

…nc dispose usage (typescript-eslint#12426) * feat: detect async usage of a sync dispose usage in no-misused-promises closes 10357 * test(eslint-plugin): add a test to cover a branch in using asyncDispose side

feat: detect async usage of a sync dispose usage in no-misused-promises

5813ce6

closes 10357

KristjanTammekivi changed the title ~~feat eslint-plugin: detect async usage of a sync dispose usage in no-misused-promises~~ feat(eslint-plugin): detect async usage of a sync dispose usage in no-misused-promises Jun 15, 2026

test(eslint-plugin): add a test to cover a branch in using asyncDispo…

e8444c3

…se side

KristjanTammekivi marked this pull request as ready for review June 15, 2026 10:36

JoshuaKGoldberg approved these changes Jul 6, 2026

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JoshuaKGoldberg reviewed Jul 6, 2026

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JoshuaKGoldberg changed the title ~~feat(eslint-plugin): detect async usage of a sync dispose usage in no-misused-promises~~ feat(eslint-plugin): [no-misused-promises] detect async usage of a sync dispose usage Jul 6, 2026

JoshuaKGoldberg merged commit 8d8fda6 into typescript-eslint:main Jul 6, 2026
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samchon mentioned this pull request Jul 13, 2026

fix(lint): make no-misused-promises follow contextual types samchon/ttsc#414

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github-actions Bot mentioned this pull request Jul 20, 2026

chore(deps): update typescript-eslint monorepo to v8.63.0 victoraugustoas/finance-manager#76

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feat(eslint-plugin): [no-misused-promises] detect async usage of a sync dispose usage - #12426

feat(eslint-plugin): [no-misused-promises] detect async usage of a sync dispose usage#12426
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KristjanTammekivi:no-misused-promises-check-synchronous-using-10357

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KristjanTammekivi commented Jun 15, 2026

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