fix(parser): error when both `projectService` and `project` are set #11333

MariaSolOs · 2025-06-23T01:33:57Z

PR Checklist

Addresses an existing open issue: fixes Bug: Parser should error when both projectService and project are set #11319
That issue was marked as accepting prs
Steps in Contributing were taken

Overview

As mentioned in the issue, the docs aren't clear of what the parser will use when both projectService and project are set. When such case is detected, I think it's better to be explicit about the misconfiguration and error as early as possible.

typescript-eslint · 2025-06-23T01:34:01Z

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☁️ Nx Cloud last updated this comment at 2025-11-10 15:19:33 UTC

JoshuaKGoldberg

These are just notes from quick preliminary review. I think we have a good path forward but should definitely let other team folks weigh in in #11319.

For now, I'll switch this PR to draft so it doesn't show up on the queue. But we can definitely un-draft it once the issue's discussion is done.

packages/typescript-estree/src/parseSettings/createParseSettings.ts

MariaSolOs · 2025-07-01T16:53:31Z

@JoshuaKGoldberg Thanks for the review! I'll wait for further thoughts from other maintainers before I continue working on this :)

codecov · 2025-08-22T01:04:34Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.66%. Comparing base (1a71f6e) to head (dba0656).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11333   +/-   ##
=======================================
  Coverage   90.66%   90.66%           
=======================================
  Files         518      518           
  Lines       52444    52454   +10     
  Branches     8690     8694    +4     
=======================================
+ Hits        47548    47558   +10     
  Misses       4882     4882           
  Partials       14       14

Flag	Coverage Δ
unittest	`90.66% <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
...pt-estree/src/parseSettings/createParseSettings.ts	`93.01% <100.00%> (+0.31%)`	⬆️

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.github/workflows/ci.yml

JoshuaKGoldberg

The source code change looks great. Just requesting adding tests: you should be able to use the existing vi.stubEnv-powered TYPESCRIPT_ESLINT_PROJECT_SERVICE ones around projectService in createParseSettings.test.ts as reference. LMK if that actually doesn't work though!

.github/workflows/ci.yml

packages/typescript-estree/src/parseSettings/createParseSettings.ts

MariaSolOs · 2025-09-11T02:10:41Z

@JoshuaKGoldberg I'm having trouble fixing these tests as I can't reproduce the errors locally. I've been running yarn nx test eslint-plugin-internal from the root of the repo, is that not the right command?

JoshuaKGoldberg · 2025-09-15T16:17:55Z

Ah, yes, these come from explicitly setting TYPESCRIPT_ESLINT_PROJECT_SERVICE:

typescript-eslint/.github/workflows/ci.yml

Lines 244 to 245 in eb4ecd8

    
           unit_tests_project_service: 
        
             name: Run Unit Tests with Project Service

typescript-eslint/.github/workflows/ci.yml

Lines 267 to 271 in eb4ecd8

    
           - name: Run unit tests for ${{ matrix.package }} 
        
             run: yarn nx test ${{ matrix.package }} --coverage=false 
        
             env: 
        
               CI: true 
        
               TYPESCRIPT_ESLINT_PROJECT_SERVICE: true

I normally run Vitest directly when only a handful of files are failing:

TYPESCRIPT_ESLINT_PROJECT_SERVICE=true yarn vitest packages/eslint-plugin-internal/tests/rules/plugin-test-formatting.test.ts

MariaSolOs · 2025-09-17T00:32:04Z

@JoshuaKGoldberg got it, thank you for the hint!

MariaSolOs · 2025-09-17T00:48:16Z

packages/eslint-plugin-internal/tests/rules/no-poorly-typed-ts-props.test.ts

  languageOptions: {
    parserOptions: {
      project: './tsconfig.json',
+      projectService: false,


Not sure if this is the right way to fix the tests in files that just use the RuleTester.

Hmm, good question. Ideally we wouldn't have to do anything in the plugin tests themselves. I'm poking around...

OK, yes, this is the right way.

Recapping for posterity: it's not apparent from the naming (sigh) but the TYPESCRIPT_ESLINT_PROJECT_SERVICE env variable's purpose isn't purely to enable projectService. It's to switch project to projectService if project is enabled. But it doesn't apply when project: false is present.

packages/typescript-estree/tests/lib/semanticInfo.test.ts

JoshuaKGoldberg · 2025-10-02T16:23:44Z

Ok, I think I have a handle on things and am most of the way through normalizing test files to handle the change. I have to step away, but in the meantime filed #11676. Expect more soon. Fun stuff! 🫠

MariaSolOs · 2025-10-02T18:44:46Z

Ok, I think I have a handle on things and am most of the way through normalizing test files to handle the change. I have to step away, but in the meantime filed #11676. Expect more soon. Fun stuff! 🫠

Thanks a lot for the help here! <3

JoshuaKGoldberg

This was a lot more work than I was expecting it to be 🙃. Sorry for "surprise!" gifting you this big of a task @MariaSolOs!

Summarizing what's going on:

Previously, if process.env.TYPESCRIPT_ESLINT_PROJECT_SERVICE was enabled, rule tests with project set were being switched to projectService
- This is why some of them set projectService: false -- to prevent that switching
- See logic in createParseSettings.ts
With this PR's intended change, that use case errors intentionally
I switched typed rule tests from manually calling new RuleTester to using a helper createRuleTesterWithTypes that:
- If it receives an enabled project, sets projectService: false like before
- Enables projectService if process.env.TYPESCRIPT_ESLINT_PROJECT_SERVICE
- Otherwise enables project

packages/typescript-estree/tests/lib/semanticInfo.test.ts

JoshuaKGoldberg · 2025-10-03T03:24:08Z

packages/eslint-plugin-internal/tests/rules/no-poorly-typed-ts-props.test.ts

  languageOptions: {
    parserOptions: {
      project: './tsconfig.json',
+      projectService: false,


OK, yes, this is the right way.

Recapping for posterity: it's not apparent from the naming (sigh) but the TYPESCRIPT_ESLINT_PROJECT_SERVICE env variable's purpose isn't purely to enable projectService. It's to switch project to projectService if project is enabled. But it doesn't apply when project: false is present.

JoshuaKGoldberg · 2025-10-03T03:33:17Z

packages/eslint-plugin/tests/RuleTester.ts

+  // Finally, default to project: true as the standard (legacy) behavior
+  // See: https://github.com/typescript-eslint/typescript-eslint/issues/11676
+  else {
+    parserOptions.project = true;
+  }


Linking #11676 here so we don't forget: if & when we remove eslint-plugin from the TYPESCRIPT_ESLINT_PROJECT_SERVICE matrix, we could switch the default to projectService: true...

(I added code myself)

MariaSolOs · 2025-10-03T04:04:23Z

Sorry for "surprise!" gifting you this big of a task @MariaSolOs!

No worries at all! At least I'm relieved that something non-trivial was going on and it wasn't just me having skill issues 😂

See logic in createParseSettings.ts

Oh my, that tsestreeOptions.project && tsestreeOptions.projectService !== false && process.env.TYPESCRIPT_ESLINT_PROJECT_SERVICE === 'true' condition does feel a bit hacky. Besides the tests in this repo, do you think there are projects out in the wild with this setup?

I switched typed rule tests from manually calling new RuleTester to using a helper createRuleTesterWithTypes that:

If it receives an enabled project, sets projectService: false like before

Enables projectService if process.env.TYPESCRIPT_ESLINT_PROJECT_SERVICE

Otherwise enables project

You're awesome, thank you for all the work here! 🦸

JoshuaKGoldberg · 2025-10-06T12:28:18Z

Besides the tests in this repo, do you think there are projects out in the wild with this setup?

I hope not... https://sourcegraph.com/search?q=context:global+TYPESCRIPT_ESLINT_PROJECT_SERVICE+-file:.*node_modules.*+-repo:%5Egithub%5C.com/typescript-eslint/typescript-eslint%24+&patternType=keyword&sm=0 shows none. I suppose we'll never know for sure though. 🤷

JoshuaKGoldberg · 2025-11-10T15:17:23Z

The ESLint lint complaint is external.

MariaSolOs · 2025-11-10T17:56:25Z

@JoshuaKGoldberg Thank you for all the guidance and helping me get this merged! <3

JoshuaKGoldberg · 2025-11-10T18:02:05Z

It was a pleasure working with you @MariaSolOs, thanks for sticking with us on it! I hope you keep contributing 😁

### Developer Checklist (Definition of Done) **Issue** - [ ] All acceptance criteria from the issue are met - [ ] Tested in latest Chrome/Firefox **UI/UX/Vis** - [ ] Requires UI/UX/Vis review - [ ] Reviewer(s) are notified (_tag assignees_) - [ ] Review has occurred (_link to notes_) - [ ] Feedback is included in this PR - [ ] Reviewer(s) approve of concept and design **Code** - [ ] Branch is up-to-date with the branch to be merged with, i.e., develop - [ ] Code is cleaned up and formatted - [ ] Unit tests are written (frontend/backend if applicable) - [ ] Integration tests are written (if applicable) **PR** - [ ] Descriptive title for this pull request is provided (will be used for release notes later) - [ ] Reviewer and assignees are defined - [ ] Add type label (e.g., *bug*, *feature*) to this pull request - [ ] Add release label (e.g., `release: minor`) to this PR following [semver](https://semver.org/) - [ ] The PR is connected to the corresponding issue (via `Closes #...`) - [ ] [Summary of changes](#summary-of-changes) is written ### Summary of changes - The latest release made this change required, otherwise we would get a "Parsing error: Enabling "project" does nothing when "projectService" is enabled. You can remove the "project" setting" error - https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.46.4 (typescript-eslint/typescript-eslint#11333) ### Screenshots ### Additional notes for the reviewer(s) - Thanks for creating this pull request 🤗

* chore: prepare next dev release * fix: set projectService to false in ESLint parserOptions (#178) ### Developer Checklist (Definition of Done) **Issue** - [ ] All acceptance criteria from the issue are met - [ ] Tested in latest Chrome/Firefox **UI/UX/Vis** - [ ] Requires UI/UX/Vis review - [ ] Reviewer(s) are notified (_tag assignees_) - [ ] Review has occurred (_link to notes_) - [ ] Feedback is included in this PR - [ ] Reviewer(s) approve of concept and design **Code** - [ ] Branch is up-to-date with the branch to be merged with, i.e., develop - [ ] Code is cleaned up and formatted - [ ] Unit tests are written (frontend/backend if applicable) - [ ] Integration tests are written (if applicable) **PR** - [ ] Descriptive title for this pull request is provided (will be used for release notes later) - [ ] Reviewer and assignees are defined - [ ] Add type label (e.g., *bug*, *feature*) to this pull request - [ ] Add release label (e.g., `release: minor`) to this PR following [semver](https://semver.org/) - [ ] The PR is connected to the corresponding issue (via `Closes #...`) - [ ] [Summary of changes](#summary-of-changes) is written ### Summary of changes - The latest release made this change required, otherwise we would get a "Parsing error: Enabling "project" does nothing when "projectService" is enabled. You can remove the "project" setting" error - https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.46.4 (typescript-eslint/typescript-eslint#11333) ### Screenshots ### Additional notes for the reviewer(s) - Thanks for creating this pull request 🤗 * Prepare release version 15.1.6 --------- Co-authored-by: datavisyn-bot <> Co-authored-by: Michael Pühringer <[email protected]>

MariaSolOs force-pushed the parser-config branch 2 times, most recently from d4979a5 to a8c4dc1 Compare June 23, 2025 04:06

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Bug: Parser should error when both projectService and project are set #11319

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MariaSolOs force-pushed the parser-config branch from a8c4dc1 to 4ff2bd3 Compare August 22, 2025 01:04

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MariaSolOs force-pushed the parser-config branch from 4ff2bd3 to 63d37d4 Compare August 22, 2025 01:19

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MariaSolOs force-pushed the parser-config branch 3 times, most recently from 8f2fe95 to 65acef6 Compare September 6, 2025 23:05

MariaSolOs force-pushed the parser-config branch from 65acef6 to 9c9c9b8 Compare September 17, 2025 00:31

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fix(parser): error when both projectService and project are set

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more env stubbing in semanticInfo.test.ts

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Repo: Stop testing eslint-plugin with both project and projectService? #11676

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More fixes, for now

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JoshuaKGoldberg added 6 commits October 2, 2025 15:19

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Move the defaulting logic into createRuleTesterWithTypes

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Fall back to project: true

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fix(typescript-estree): infers singleRun as true for project service #11327

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JoshuaKGoldberg merged commit 997e0c0 into typescript-eslint:main Nov 10, 2025
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MariaSolOs deleted the parser-config branch November 10, 2025 17:56

chrisbbreuer mentioned this pull request Nov 10, 2025

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

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fix(deps): update all non-major dependencies open-turo/eslint-config-typescript#461

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fix: set projectService to false in ESLint parserOptions datavisyn/visyn_scripts#178

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chabb mentioned this pull request Nov 12, 2025

Parsing error: Enabling "project" does nothing when "projectService" is enabled. You can remove the "project" setting" ngrx/platform#4993

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fix(parser): error when both projectService and project are set #11333

fix(parser): error when both projectService and project are set #11333

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fix(parser): error when both `projectService` and `project` are set #11333

fix(parser): error when both `projectService` and `project` are set #11333

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