fix(typescript-estree): forbid abstract method and accessor to have implementation #11657

fisker · 2025-09-28T14:39:26Z

PR Checklist

Addresses an existing open issue: fixes Enhancement: Forbid abstract method to have implementation #11653 fixes Enhancement: Forbid abstract accessor to have implementation #11654
That issue was marked as accepting prs
Steps in Contributing were taken

Overview

typescript-eslint · 2025-09-28T14:39:29Z

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nx-cloud · 2025-09-28T14:41:04Z

View your CI Pipeline Execution ↗ for commit c30d11d

Command	Status	Duration	Result
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`nx run-many -t lint`	✅ Succeeded	3m 15s	View ↗
`nx run types:build`	✅ Succeeded	5s	View ↗
`nx test typescript-estree --coverage=false`	✅ Succeeded	2s	View ↗
`nx run integration-tests:test`	✅ Succeeded	5s	View ↗
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☁️ Nx Cloud last updated this comment at 2025-09-29 17:49:21 UTC

codecov · 2025-09-29T16:39:06Z

Codecov Report

❌ Patch coverage is 5.55556% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.90%. Comparing base (967764e) to head (c30d11d).
⚠️ Report is 33 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/typescript-estree/src/convert.ts	0.00%	11 Missing ⚠️
packages/typescript-estree/src/node-utils.ts	14.28%	6 Missing ⚠️

❌ Your patch status has failed because the patch coverage (5.55%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11657      +/-   ##
==========================================
- Coverage   90.93%   90.90%   -0.03%     
==========================================
  Files         506      506              
  Lines       51400    51414      +14     
  Branches     8484     8483       -1     
==========================================
- Hits        46741    46739       -2     
- Misses       4646     4662      +16     
  Partials       13       13

Flag	Coverage Δ
unittest	`90.90% <5.55%> (-0.03%)`	⬇️

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

Files with missing lines	Coverage Δ
packages/typescript-estree/src/node-utils.ts	`62.50% <14.28%> (-0.55%)`	⬇️
packages/typescript-estree/src/convert.ts	`30.16% <0.00%> (-0.07%)`	⬇️

... and 1 file with indirect coverage changes

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JoshuaKGoldberg

Fantastic - very clean and thorough. Nice!

Just requesting the one (Missing) case be tested or removed. Otherwise this looks ready to go to me.

JoshuaKGoldberg · 2025-10-03T12:12:09Z

packages/eslint-plugin/tests/rules/naming-convention/naming-convention.test.ts

[Praise] Nice, always happy to see this file cleaned up.

JoshuaKGoldberg · 2025-10-03T12:13:50Z

packages/typescript-estree/src/node-utils.ts

+  ast: ts.SourceFile,
+): string {
+  const text = ast.text.slice(name.pos, name.end).trimStart();
+  return text || '(Missing)';


'(Missing)'

[Testing] This doesn't show up in any of the snapshots. Can you either add a test showing it (if it's possible?) or remove it?

This original declarationNameToString from typescript package have this, so I guess it's possible, but I don't know how to test.

👍 makes sense, I think it's reasonable to leave in then. Thanks.

JoshuaKGoldberg · 2025-10-03T12:14:25Z

packages/typescript-estree/src/convert.ts

+            node.kind === SyntaxKind.GetAccessor ||
+              node.kind === SyntaxKind.SetAccessor
+              ? 'An abstract accessor cannot have an implementation.'
+              : `Method '${declarationNameToString(node.name, this.ast)}' cannot have an implementation because it is marked abstract.`,


[Praise] These are great error messages! 👏

@fisker

| datasource | package | from | to | | ---------- | -------------------------------- | ------ | ------ | | npm | @typescript-eslint/eslint-plugin | 8.45.0 | 8.46.0 | | npm | @typescript-eslint/parser | 8.45.0 | 8.46.0 | ## [v8.46.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8460-2025-10-06) ##### 🚀 Features - **eslint-plugin:** \[no-unsafe-member-access] add allowOptionalChaining option ([#11659](typescript-eslint/typescript-eslint#11659)) - **rule-schema-to-typescript-types:** clean up and make public ([#11633](typescript-eslint/typescript-eslint#11633)) ##### 🩹 Fixes - **eslint-plugin:** \[prefer-readonly-parameter-types] ignore tagged primitives ([#11660](typescript-eslint/typescript-eslint#11660)) - **typescript-estree:** forbid abstract method and accessor to have implementation ([#11657](typescript-eslint/typescript-eslint#11657)) - **eslint-plugin:** removed error type previously deprecated ([#11674](typescript-eslint/typescript-eslint#11674)) - **eslint-plugin:** \[no-deprecated] ignore deprecated `export import`s ([#11603](typescript-eslint/typescript-eslint#11603)) - **eslint-plugin:** \[unbound-method] improve wording around `this: void` and binding ([#11634](typescript-eslint/typescript-eslint#11634)) - **rule-tester:** deprecate TestCaseError#type and LintMessage#nodeType ([#11628](typescript-eslint/typescript-eslint#11628)) - **eslint-plugin:** \[no-floating-promises] remove excess parentheses in suggestions ([#11487](typescript-eslint/typescript-eslint#11487)) ##### ❤️ Thank You - fisker Cheung [@fisker](https://github.com/fisker) - Josh Goldberg ✨ - Kirk Waiblinger [@kirkwaiblinger](https://github.com/kirkwaiblinger) - Mark de Dios [@peanutenthusiast](https://github.com/peanutenthusiast) - Richard Torres [@richardtorres314](https://github.com/richardtorres314) - Victor Genaev [@mainframev](https://github.com/mainframev) You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website.

@fisker

| datasource | package | from | to | | ---------- | -------------------------------- | ------ | ------ | | npm | @typescript-eslint/eslint-plugin | 8.45.0 | 8.46.0 | | npm | @typescript-eslint/parser | 8.45.0 | 8.46.0 | ## [v8.46.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8460-2025-10-06) ##### 🚀 Features - **eslint-plugin:** \[no-unsafe-member-access] add allowOptionalChaining option ([#11659](typescript-eslint/typescript-eslint#11659)) - **rule-schema-to-typescript-types:** clean up and make public ([#11633](typescript-eslint/typescript-eslint#11633)) ##### 🩹 Fixes - **eslint-plugin:** \[prefer-readonly-parameter-types] ignore tagged primitives ([#11660](typescript-eslint/typescript-eslint#11660)) - **typescript-estree:** forbid abstract method and accessor to have implementation ([#11657](typescript-eslint/typescript-eslint#11657)) - **eslint-plugin:** removed error type previously deprecated ([#11674](typescript-eslint/typescript-eslint#11674)) - **eslint-plugin:** \[no-deprecated] ignore deprecated `export import`s ([#11603](typescript-eslint/typescript-eslint#11603)) - **eslint-plugin:** \[unbound-method] improve wording around `this: void` and binding ([#11634](typescript-eslint/typescript-eslint#11634)) - **rule-tester:** deprecate TestCaseError#type and LintMessage#nodeType ([#11628](typescript-eslint/typescript-eslint#11628)) - **eslint-plugin:** \[no-floating-promises] remove excess parentheses in suggestions ([#11487](typescript-eslint/typescript-eslint#11487)) ##### ❤️ Thank You - fisker Cheung [@fisker](https://github.com/fisker) - Josh Goldberg ✨ - Kirk Waiblinger [@kirkwaiblinger](https://github.com/kirkwaiblinger) - Mark de Dios [@peanutenthusiast](https://github.com/peanutenthusiast) - Richard Torres [@richardtorres314](https://github.com/richardtorres314) - Victor Genaev [@mainframev](https://github.com/mainframev) You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website.

fisker force-pushed the class-abstract-method branch from fcd0b87 to 4230204 Compare September 28, 2025 15:08

fisker force-pushed the class-abstract-method branch from 2d59c8f to 1d5e23c Compare September 29, 2025 16:42

fisker changed the title ~~fix(typescript-estree): forbid abstract method to have implementation~~ fix(typescript-estree): forbid abstract method and accessor to have implementation Sep 29, 2025

fisker marked this pull request as draft September 29, 2025 16:56

fisker marked this pull request as ready for review September 29, 2025 17:42

fisker added 8 commits September 30, 2025 01:42

fix(typescript-estree): forbid abstract method to have implementation

5e37414

One more test

7fbd6e6

Fix tests?

f936621

Fix rule tests

a187b90

Fix test

8c9ad39

Fix test

101d790

Accessor

5ca86a8

constructor

c30d11d

fisker force-pushed the class-abstract-method branch from e6587ff to c30d11d Compare September 29, 2025 17:42

JoshuaKGoldberg requested changes Oct 3, 2025

View reviewed changes

JoshuaKGoldberg added the awaiting response Issues waiting for a reply from the OP or another party label Oct 3, 2025

JoshuaKGoldberg merged commit 02e0278 into typescript-eslint:main Oct 6, 2025
64 of 66 checks passed

fisker deleted the class-abstract-method branch October 6, 2025 14:10

fossabot bot mentioned this pull request Oct 9, 2025

Bump @typescript-eslint/eslint-plugin from 8.44.1 to 8.46.0 fossas/fossa-action#220

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fix(typescript-estree): forbid abstract method and accessor to have implementation #11657

fix(typescript-estree): forbid abstract method and accessor to have implementation #11657

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fisker commented Sep 28, 2025 •

edited by JoshuaKGoldberg

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