feat(eslint-plugin): [no-unused-private-class-members] new extension rule #10913

bradzacher · 2025-03-03T02:18:05Z

PR Checklist

Addresses an existing open issue: fixes Rule proposal: no-unused-private-class-members #4571
That issue was marked as accepting prs
Steps in Contributing were taken

Overview

This PR implements an extension rule for no-unused-private-class-members that introduces support for private members.

…rule

typescript-eslint · 2025-03-03T02:18:08Z

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JoshuaKGoldberg

packages/eslint-plugin/src/rules/no-unused-private-class-members.ts

ronami · 2025-03-06T15:02:41Z

packages/eslint-plugin/src/rules/no-unused-private-class-members.ts

+      // mark the first member we encounter as used. If you were to delete the
+      // member, then any subsequent usage could incorrectly mark the member of
+      // an encapsulating parent class as used, which is incorrect.
+      trackedClassMembersUsed.add(memberDefinition.declaredNode);


[Bug]: I've noticed some missed reports with functions that have a different this than the class instance (deploy preview playground link):

class Test1 { // should be reported but doesn't? private bar: number; foo = function () { return this.bar; } }

This is because the base rule doesn't support that case because this.#bar is a syntax error inside a function expression!!

It's worth noting that TS doesn't actually catch this case either and reports bar as unused because the type of the this in the function expression is any!
If you turn on noImplicitThis then TS will error on that this

We could support this if we wanted to. I'm leaning towards not because TS itself doesn't catch it either.

Yes! I think the rule should report bar as unused in this case. I've mentioned this since TypeScript reports it as unused but the rule doesn't report it as unused (regardless of the type error).

Coming back to this -- my code handles this correctly because realistically it is an actual usage of the parameter.

For example new Test1().foo() will return the value of bar.
There's an implicit binding here and so I think this is fine to keep not reporting on.

packages/eslint-plugin/src/rules/no-unused-private-class-members.ts

ronami

Looks amazing! Excited to enable this on projects I work on 🚀🚀🚀

(I accidentally posted the review earlier while still adding comments 🙈)

packages/eslint-plugin/docs/rules/no-unused-private-class-members.mdx

bradzacher · 2025-03-10T10:28:12Z

FYI I'm going to make @Josh-Cena very happy - I'm going to build a "class scope analyser" so we can do this right rather than just hacking it in.

This does mean that I'm going to rewrite the rule from the ground up -- but it'll be worht it

kirkwaiblinger · 2025-03-19T06:34:57Z

FYI I'm going to make @Josh-Cena very happy - I'm going to build a "class scope analyser" so we can do this right rather than just hacking it in.

This does mean that I'm going to rewrite the rule from the ground up -- but it'll be worht it

Do you intend for this to proceed as-is, with this work intended to happen in the future, or should we pause/draft it pending this work?

bradzacher · 2025-03-19T07:57:54Z

Let's draft it.
We need to at least handle the static property case.
Might have some time soon to pick the work back up.

ronami

Looks amazing and a very beneficial rule to have; just a few small comments from me 🚀🚀🚀

packages/eslint-plugin/src/rules/no-unused-private-class-members.ts

packages/eslint-plugin/src/util/class-scope-analyzer/classScopeAnalyzer.ts

ronami · 2025-08-24T06:41:29Z

packages/eslint-plugin/src/rules/no-unused-private-class-members.ts

+  meta: {
+    type: 'problem',
+    docs: {
+      description: 'Disallow unused private class members',


I think this is a bug and shouldn't be reported (deploy preview playground link):

class Test1 { // reported but shouldn't? private foo: number | null; public bar() { this.foo ??= 1; } }

This is a weird case that isn't currently reported by no-unused-vars but really should be.

It is reported by the base no-unused-private-class-members rule

There was just a recent eslint bug report about these; I guess it's intentional for no-unused-vars since x ?? = y reads x first (equivalent to x != null ? x : (x = y)) rather than unconditionally assigning (x = x != null ? x : y). See eslint/eslint#20029. But presumably the two rules should agree?

Oh, but do note that these are reported by no-useless-assignment so 🤷‍♂️ 🤷‍♂️

(playground)

we should probably file a bug for NUPCM then so it matches NUV?

JoshuaKGoldberg

I have very little to add that Kirk and Ronami didn't already. Very exciting!! ⚡

packages/eslint-plugin/src/util/class-scope-analyzer/extractComputedName.ts

JoshuaKGoldberg · 2025-09-29T15:25:19Z

packages/eslint-plugin/src/util/class-scope-analyzer/extractComputedName.ts

+ */
+export function extractNameForMember(node: MemberNode): [Key, string] | null {
+  if (node.computed) {
+    return extractComputedName(node.key);


Just noting, #11006 has some other logic around computed keys. It might be useful to unify?

bradzacher · 2025-10-20T11:36:35Z

@ronami / @JoshuaKGoldberg / @kirkwaiblinger

Added support for:

Parameter properties

class Test1 {
  constructor(
    // errors
    private parameterPropertyUnused: number,
    // no error
    private parameterPropertyUsed: number,   
  ) {}

  method() {
    return this.parameterPropertyUsed;
  }
}

Usage of a private class member via explicitly and simply annotated variables:

class Foo {
  // no longer reported
  private prop: number;
  // no longer reported
  private staticProp: number;

  method1(thing: Foo) {
    return thing.prop;
  }
  method2(thing: typeof Foo) {
    return thing.staticProp;
  }
}

Usage of a private class member via simple assignment:

class Foo {
  // no longer reported
  private prop: number;
  method() {
    const self = this;
    return self.prop;
  }
}

JoshuaKGoldberg

Lint complaints notwithstanding, this looks great to me! I'll defer to the other reviewers on the finer points they're calling out. But the overall scope analyzer looks great and I'm very happy with the clean rule implementation. Nicely done! 👏

packages/eslint-plugin/src/util/class-scope-analyzer/types.ts

ronami

Looking great 👏👏👏

codecov · 2025-11-11T16:33:31Z

Codecov Report

❌ Patch coverage is 82.10181% with 109 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.56%. Comparing base (0fac889) to head (f7beddc).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...rc/util/class-scope-analyzer/classScopeAnalyzer.ts	82.45%	82 Missing and 1 partial ⚠️
...c/util/class-scope-analyzer/extractComputedName.ts	65.33%	26 Missing ⚠️

❌ Your patch status has failed because the patch coverage (82.10%) 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   #10913      +/-   ##
==========================================
- Coverage   90.66%   90.56%   -0.10%     
==========================================
  Files         518      522       +4     
  Lines       52454    53063     +609     
  Branches     8694     8838     +144     
==========================================
+ Hits        47558    48058     +500     
- Misses       4882     4990     +108     
- Partials       14       15       +1

Flag	Coverage Δ
unittest	`90.56% <82.10%> (-0.10%)`	⬇️

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

Files with missing lines	Coverage Δ
packages/eslint-plugin/src/configs/eslintrc/all.ts	`100.00% <100.00%> (ø)`
packages/eslint-plugin/src/configs/flat/all.ts	`100.00% <100.00%> (ø)`
...lugin/src/rules/no-unused-private-class-members.ts	`100.00% <100.00%> (ø)`
...lint-plugin/src/util/class-scope-analyzer/types.ts	`100.00% <100.00%> (ø)`
...c/util/class-scope-analyzer/extractComputedName.ts	`65.33% <65.33%> (ø)`
...rc/util/class-scope-analyzer/classScopeAnalyzer.ts	`82.45% <82.45%> (ø)`

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| datasource | package | from | to | | ---------- | -------------------------------- | ------ | ------ | | npm | @typescript-eslint/eslint-plugin | 8.46.1 | 8.47.0 | | npm | @typescript-eslint/parser | 8.46.1 | 8.47.0 | ## [v8.47.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8470-2025-11-17) ##### 🚀 Features - **eslint-plugin:** \[no-unused-private-class-members] new extension rule ([#10913](typescript-eslint/typescript-eslint#10913)) ##### ❤️ Thank You - Brad Zacher [@bradzacher](https://github.com/bradzacher) You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.46.4](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8464-2025-11-10) ##### 🩹 Fixes - **parser:** error when both `projectService` and `project` are set ([#11333](typescript-eslint/typescript-eslint#11333)) - **eslint-plugin:** handle override modifier in promise-function-async fixer ([#11730](typescript-eslint/typescript-eslint#11730)) - **eslint-plugin:** \[no-deprecated] fix double-report on computed literal identifiers ([#11006](typescript-eslint/typescript-eslint#11006), [#10958](typescript-eslint/typescript-eslint#10958)) ##### ❤️ Thank You - Evgeny Stepanovych [@undsoft](https://github.com/undsoft) - Kentaro Suzuki [@sushichan044](https://github.com/sushichan044) - Maria Solano [@MariaSolOs](https://github.com/MariaSolOs) You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.46.3](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8463-2025-11-03) ##### 🩹 Fixes - **eslint-plugin:** \[no-duplicate-enum-values] support signed numbers ([#11722](typescript-eslint/typescript-eslint#11722), [#11723](typescript-eslint/typescript-eslint#11723)) - **eslint-plugin:** \[no-misused-promises] expand union type to retrieve target property ([#11706](typescript-eslint/typescript-eslint#11706)) ##### ❤️ Thank You - Evgeny Stepanovych [@undsoft](https://github.com/undsoft) - tao You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.46.2](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8462-2025-10-20) ##### 🩹 Fixes - **eslint-plugin:** \[prefer-optional-chain] skip optional chaining when it could change the result ([#11702](typescript-eslint/typescript-eslint#11702)) ##### ❤️ Thank You - mdm317 You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website.

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| datasource | package | from | to | | ---------- | -------------------------------- | ------ | ------ | | npm | @typescript-eslint/eslint-plugin | 8.46.1 | 8.47.0 | | npm | @typescript-eslint/parser | 8.46.1 | 8.47.0 | ## [v8.47.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8470-2025-11-17) ##### 🚀 Features - **eslint-plugin:** \[no-unused-private-class-members] new extension rule ([#10913](typescript-eslint/typescript-eslint#10913)) ##### ❤️ Thank You - Brad Zacher [@bradzacher](https://github.com/bradzacher) You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.46.4](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8464-2025-11-10) ##### 🩹 Fixes - **parser:** error when both `projectService` and `project` are set ([#11333](typescript-eslint/typescript-eslint#11333)) - **eslint-plugin:** handle override modifier in promise-function-async fixer ([#11730](typescript-eslint/typescript-eslint#11730)) - **eslint-plugin:** \[no-deprecated] fix double-report on computed literal identifiers ([#11006](typescript-eslint/typescript-eslint#11006), [#10958](typescript-eslint/typescript-eslint#10958)) ##### ❤️ Thank You - Evgeny Stepanovych [@undsoft](https://github.com/undsoft) - Kentaro Suzuki [@sushichan044](https://github.com/sushichan044) - Maria Solano [@MariaSolOs](https://github.com/MariaSolOs) You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.46.3](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8463-2025-11-03) ##### 🩹 Fixes - **eslint-plugin:** \[no-duplicate-enum-values] support signed numbers ([#11722](typescript-eslint/typescript-eslint#11722), [#11723](typescript-eslint/typescript-eslint#11723)) - **eslint-plugin:** \[no-misused-promises] expand union type to retrieve target property ([#11706](typescript-eslint/typescript-eslint#11706)) ##### ❤️ Thank You - Evgeny Stepanovych [@undsoft](https://github.com/undsoft) - tao You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.46.2](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8462-2025-10-20) ##### 🩹 Fixes - **eslint-plugin:** \[prefer-optional-chain] skip optional chaining when it could change the result ([#11702](typescript-eslint/typescript-eslint#11702)) ##### ❤️ Thank You - mdm317 You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website.

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| datasource | package | from | to | | ---------- | -------------------------------- | ------ | ------ | | npm | @typescript-eslint/eslint-plugin | 8.46.1 | 8.47.0 | | npm | @typescript-eslint/parser | 8.46.1 | 8.47.0 | ## [v8.47.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8470-2025-11-17) ##### 🚀 Features - **eslint-plugin:** \[no-unused-private-class-members] new extension rule ([#10913](typescript-eslint/typescript-eslint#10913)) ##### ❤️ Thank You - Brad Zacher [@bradzacher](https://github.com/bradzacher) You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.46.4](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8464-2025-11-10) ##### 🩹 Fixes - **parser:** error when both `projectService` and `project` are set ([#11333](typescript-eslint/typescript-eslint#11333)) - **eslint-plugin:** handle override modifier in promise-function-async fixer ([#11730](typescript-eslint/typescript-eslint#11730)) - **eslint-plugin:** \[no-deprecated] fix double-report on computed literal identifiers ([#11006](typescript-eslint/typescript-eslint#11006), [#10958](typescript-eslint/typescript-eslint#10958)) ##### ❤️ Thank You - Evgeny Stepanovych [@undsoft](https://github.com/undsoft) - Kentaro Suzuki [@sushichan044](https://github.com/sushichan044) - Maria Solano [@MariaSolOs](https://github.com/MariaSolOs) You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.46.3](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8463-2025-11-03) ##### 🩹 Fixes - **eslint-plugin:** \[no-duplicate-enum-values] support signed numbers ([#11722](typescript-eslint/typescript-eslint#11722), [#11723](typescript-eslint/typescript-eslint#11723)) - **eslint-plugin:** \[no-misused-promises] expand union type to retrieve target property ([#11706](typescript-eslint/typescript-eslint#11706)) ##### ❤️ Thank You - Evgeny Stepanovych [@undsoft](https://github.com/undsoft) - tao You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. ## [v8.46.2](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8462-2025-10-20) ##### 🩹 Fixes - **eslint-plugin:** \[prefer-optional-chain] skip optional chaining when it could change the result ([#11702](typescript-eslint/typescript-eslint#11702)) ##### ❤️ Thank You - mdm317 You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website.

feat(eslint-plugin): [no-unused-private-class-members] new extension …

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bradzacher added the enhancement: new base rule extension New base rule extension required to handle a TS specific case label Mar 3, 2025

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support accessor properties

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WIP class scope analyser

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bradzacher added 2 commits July 6, 2025 16:34

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got it all working

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Merge branch 'main' into no-unused-private-class-members

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feat(eslint-plugin): [no-unused-private-class-members] new extension rule #11598

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Merge branch 'main' into no-unused-private-class-members

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support parameter properties

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handle some simple scope analysis cases

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bradzacher requested review from JoshuaKGoldberg, kirkwaiblinger and ronami October 20, 2025 11:36

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bradzacher added 3 commits November 11, 2025 11:17

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Merge branch 'main' into no-unused-private-class-members

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bradzacher merged commit 6c6db24 into main Nov 11, 2025
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bradzacher linked an issue Nov 11, 2025 that may be closed by this pull request

Rule proposal: no-unused-private-class-members #4571

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chrisbbreuer mentioned this pull request Nov 17, 2025

chore(deps): update all non-major dependencies stacksjs/eslint-plugin#67

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chore(deps): update typescript-eslint monorepo to v8.47.0 rshade/mcp-devtools-server#240

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feat(eslint-plugin): [no-unused-private-class-members] new extension rule #10913

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