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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!

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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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View your CI Pipeline Execution ↗ for commit b19188d

Command Status Duration Result
nx run-many -t typecheck ✅ Succeeded 2m 11s View ↗
nx run-many -t lint ✅ Succeeded 2m 4s View ↗
nx run integration-tests:test ✅ Succeeded 5s View ↗
nx test eslint-plugin --coverage=false ✅ Succeeded 3s View ↗
nx run generate-configs ✅ Succeeded 8s View ↗
nx test eslint-plugin-internal --coverage=false ✅ Succeeded 2s View ↗
nx test typescript-estree --coverage=false ✅ Succeeded 1s View ↗
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☁️ Nx Cloud last updated this comment at 2025-07-03 19:30:58 UTC

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.84%. Comparing base (5b378e2) to head (b19188d).

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
@kirkwaiblinger kirkwaiblinger force-pushed the error-on-nested-extends branch from a650f88 to b19188d Compare July 3, 2025 19:25
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Enhancement: tseslint.config() should prohibit nested extends
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@kirkwaiblinger