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fix(typescript-eslint): error on nested extends in tseslint.config() #11361

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fix(typescript-eslint): error on nested extends in tseslint.config() #11361

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Overview

Adds validation.

Stacked on top of #11357; will undraft when that is merged.

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Thanks for the PR, @kirkwaiblinger!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

🙏 Please, if you or your company is finding typescript-eslint valuable, help us sustain the project by sponsoring it transparently on https://opencollective.com/typescript-eslint.

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@kirkwaiblinger kirkwaiblinger changed the title Error on nested extends fix(typescript-eslint): Error on nested extends in tseslint.config() Jun 30, 2025
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nx-cloud bot commented Jun 30, 2025 •
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View your CI Pipeline Execution ↗ for commit a5265df.

Command Status Duration Result
nx run-many -t typecheck ✅ Succeeded 1m 56s View ↗
nx run-many -t lint ✅ Succeeded 10s View ↗
nx test typescript-estree --coverage=false ✅ Succeeded <1s View ↗
nx test eslint-plugin --coverage=false ✅ Succeeded <1s View ↗
nx test eslint-plugin-internal --coverage=false ✅ Succeeded <1s View ↗
nx run integration-tests:test ✅ Succeeded <1s View ↗
nx run types:build ✅ Succeeded 1s View ↗
nx run generate-configs ✅ Succeeded 5s View ↗
Additional runs (27) ✅ Succeeded ... View ↗

☁️ Nx Cloud last updated this comment at 2025-06-30 23:27:22 UTC

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codecov bot commented Jun 30, 2025

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.84%. Comparing base (02ee81b) to head (a5265df).
Report is 3 commits behind head on main.

Additional details and impacted files 
@@           Coverage Diff           @@
##             main   #11361   +/-   ##
=======================================
  Coverage   90.84%   90.84%           
=======================================
  Files         501      501           
  Lines       50919    50933   +14     
  Branches     8387     8392    +5     
=======================================
+ Hits        46256    46270   +14     
  Misses       4648     4648           
  Partials       15       15
Flag Coverage Δ
unittest 90.84% <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
packages/typescript-eslint/src/config-helper.ts 100.00% <100.00%> (ø)
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@kirkwaiblinger kirkwaiblinger changed the title fix(typescript-eslint): Error on nested extends in tseslint.config() fix(typescript-eslint): error on nested extends in tseslint.config() Jul 1, 2025
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Enhancement: tseslint.config() should prohibit nested extends
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@kirkwaiblinger