typescript-eslint Release Notes

8.59.4 (2026-05-18)

🩹 Fixes

eslint-plugin: [no-floating-promises] stack overflow when using recursive types (#12294)

project-service: throw error cause in getParsedConfigFileFromTSServer (#12321)

typescript-eslint: export Compatible* types from typescript-eslint to resolve pnpm TS error (#12340)

❤️ Thank You

Evyatar Daud @StyleShit

Kirk Waiblinger @kirkwaiblinger

lumir

See GitHub Releases for more information.

You can read about our versioning strategy and releases on our website.

8.59.2 (2026-05-04)

🩹 Fixes

• eslint-plugin: [no-unsafe-type-assertion] handle crash on recursive template literal types (#12150)
• eslint-plugin: [no-deprecated] object destructuring values should be treated as declarations (#12292)
• rule-tester: add TypeScript as a peer dependency (#12288)

❤️ Thank You

Dariusz Czajkowski

Dima Barabash

Kirk Waiblinger @kirkwaiblinger

See GitHub Releases for more information.

You can read about our versioning strategy and releases on our website.

8.59.1 (2026-04-27)

🩹 Fixes

eslint-plugin: [no-unnecessary-type-assertion] fix crash "TypeError: checker.getTypeArguments is not a function" (#12246)
eslint-plugin: [no-unnecessary-type-assertion] preserve index signatures in undefined unions (#12257)
eslint-plugin: [no-unnecessary-type-assertion] preserve phantom type arguments in generic inference (#12269)
eslint-plugin: [no-unnecessary-type-assertion] avoid false positive in logical assignment assertions (#12278)
eslint-plugin: [no-unnecessary-type-arguments] handle instantiation expressions (#12220)
eslint-plugin: [no-unnecessary-condition] treat void as nullish in no-unnecessary-condition (#12241)

❤️ Thank You

anasm266 @anasm266
Anshika Jain @Anshikakalpana
Ulrich Stark
yugo innami @nami8824

See GitHub Releases for more information.

You can read about our versioning strategy and releases on our website.

8.58.0 (2026-03-30)

🚀 Features

support TypeScript 6 (#12124)

🩹 Fixes

eslint-plugin: crash in no-unnecessary-type-arguments (#12163)

eslint-plugin: [no-extraneous-class] handle index signatures (#12142)

eslint-plugin: [prefer-regexp-exec] avoid fixing unknown RegExp flags (#12161)

❤️ Thank You

ej shafran @ej-shafran

Evyatar Daud @StyleShit

GG ZIBLAKING

milkboy2564 @SeolJaeHyeok

teee32 @teee32

See GitHub Releases for more information.

You can read about our versioning strategy and releases on our website.

8.57.2 (2026-03-23)

🩹 Fixes

• eslint-plugin: [prefer-optional-chain] remove dangling closing parenthesis (#11865)
• eslint-plugin: [array-type] ignore Array and ReadonlyArray without type arguments (#11971)
• eslint-plugin: [no-restricted-types] flag banned generics in extends or implements (#12120)
• eslint-plugin: [no-unsafe-return] false positive on unwrapping generic (#12125)
• eslint-plugin: [no-unsafe-return] false positive on unwrapping generic (#12125)
• eslint-plugin: [no-useless-default-assignment] skip reporting false positives for unresolved type parameters (#12127)
• eslint-plugin: [prefer-readonly-parameter-types] preserve type alias infomation (#11954)
• typescript-estree: skip createIsolatedProgram fallback for projectService (#12066, #12065)

❤️ Thank You

Kirk Waiblinger @kirkwaiblinger
Konv Suu
mdm317
Newton Yuan @NewtonYuan
RyoheiYamamoto
SungHyun627 @SungHyun627
Tamashoo @Tamashoo

See GitHub Releases for more information.
You can read about our versioning strategy and releases on our website.

8.57.0 (2026-03-09)

🚀 Features

• eslint-plugin: [no-unnecessary-condition] allow literal loop conditions in for/do loops (#12080)

🩹 Fixes

• eslint-plugin: [strict-void-return] false positives with overloads (#12055)
• eslint-plugin: handle statically analyzable computed keys in prefer-readonly (#12079)
• eslint-plugin: guard against negative paramIndex in no-useless-default-assignment (#12077)
• eslint-plugin: [prefer-promise-reject-errors] add allow TypeOrValueSpecifier to prefer-promise-reject-errors (#12094)
• eslint-plugin: [no-base-to-string] fix false positive for toString with overloads (#12089)
  -typescript-estree: switch back to use ts.getModifiers() (#12034)
  -typescript-estree: if the template literal is tagged and the text has an invalid escape, cooked will be null (#11355)

❤️ Thank You

• Brad Zacher @bradzacher
• Brian Schlenker @bschlenk
• Evyatar Daud @StyleShit
• fisker Cheung @fisker
• James Henry @JamesHenry
• Josh Goldberg
• Kirk Waiblinger @kirkwaiblinger
• Moses Odutusin @thebolarin
• Newton Yuan @NewtonYuan
• SungHyun627 @SungHyun627
• Younsang Na @nayounsang

See GitHub Releases for more information.

You can read about our versioning strategy and releases on our website.

8.55.0 (2026-02-09)

🚀 Features

• utils: deprecate defaultOptions in favor of meta.defaultOptions (#11992)

🩹 Fixes

• eslint-plugin: [no-unused-vars] remove trailing newline when removing entire import (#11990)
• eslint-plugin: [no-useless-default-assignment] require strictNullChecks (#11966, #12000)
• eslint-plugin: [no-useless-default-assignment] report unnecessary defaults in ternary expressions (#11984)
• eslint-plugin: [no-useless-default-assignment] reduce param index to ts this handling (#11949)
• typescript-estree: forbid invalid modifier in object expression (#11931)

❤️ Thank You

• Christian Rose @chrros95
• fisker Cheung @fisker
• Josh Goldberg
• Maria Solano @MariaSolOs
• Minyeong Kim @minyeong981
• SungHyun627 @SungHyun627
• Yukihiro Hasegawa @y-hsgw

See GitHub Releases for more information.

You can read about our versioning strategy and releases on our website.