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fix(eslint-plugin): [no-unused-vars] no is assigned a value but only used as a type error when it has a same name #11322

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@nayounsang nayounsang commented Jun 20, 2025

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Overview

Strict checks on exports with same type and variable name

  • If the name is the same, the variable is isTypeVariable && isValueVariable.
  • ClassName, TSEnumName, TSModuleName, ImportBinding and arguments also have same characteristics
  • Therefore, only the cases that correspond to the issue are properly verified.

Perform additional validating for abnormal cases

  • def.node.type !== AST_NODE_TYPES.TSTypeAliasDeclaration

Add test cases

  • tc mentioned in issue and similar but valid

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Thanks for the PR, @nayounsang!

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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@nayounsang nayounsang changed the title fix(eslint-plugin): [no-unused-vars] no is assigned a value but only used as a type error when it has a same name type alias declaration exporte fix(eslint-plugin): [no-unused-vars] no is assigned a value but only used as a type error when it has a same name Jun 20, 2025
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View your CI Pipeline Execution ↗ for commit 2f474b3.

Command Status Duration Result
nx test eslint-plugin --coverage=false ✅ Succeeded 5m 1s View ↗
nx run-many -t typecheck ✅ Succeeded 2m 6s 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-many -t lint ✅ Succeeded 10s View ↗
nx test typescript-estree --coverage=false ✅ Succeeded <1s View ↗
nx run generate-configs ✅ Succeeded 4s View ↗
Additional runs (27) ✅ Succeeded ... View ↗

☁️ Nx Cloud last updated this comment at 2025-06-20 12:53:10 UTC

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codecov bot commented Jun 20, 2025

Codecov Report

Attention: Patch coverage is 88.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 90.84%. Comparing base (76cc62c) to head (2f474b3).

Files with missing lines Patch % Lines
...s/eslint-plugin/src/util/collectUnusedVariables.ts 88.00% 3 Missing ⚠️

❌ Your patch check has failed because the patch coverage (88.00%) 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   #11322   +/-   ##
=======================================
  Coverage   90.84%   90.84%           
=======================================
  Files         501      501           
  Lines       50911    50932   +21     
  Branches     8383     8391    +8     
=======================================
+ Hits        46248    46269   +21     
  Misses       4648     4648           
  Partials       15       15           
Flag Coverage Δ
unittest 90.84% <88.00%> (+<0.01%) ⬆️

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

Files with missing lines Coverage Δ
...s/eslint-plugin/src/util/collectUnusedVariables.ts 96.34% <88.00%> (+0.15%) ⬆️
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function isSafeUnusedExportCondition(variable: ScopeVariable): boolean {
if (variable instanceof ESLintScopeVariable) {
return true;
}
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@nayounsang nayounsang Jun 20, 2025

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need advice

I don't know why this condition is necessary. Can't the arg type of isExported, isMergableExported be used as Variable?
Actually, it is used as Variable only.

@@ -465,7 +495,12 @@ function isExported(variable: ScopeVariable): boolean {
}

// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
return node.parent!.type.startsWith('Export');
const isExportedFlag = node.parent!.type.startsWith('Export');
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@nayounsang nayounsang Jun 20, 2025

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need advice

Is there a reason why didn't use optional chaining before?

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Bug: [no-unused-vars] no is assigned a value but only used as a type error when it has a same name type alias declaration exported
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