fix(eslint-plugin): [prefer-nullish-coalescing] ignoreBooleanCoercion should not apply to top-level ternary expressions #11614

mdm317 · 2025-09-18T07:19:01Z

PR Checklist

Addresses an existing open issue: fixes Bug: [prefer-nullish-coalescing] ignoreBooleanCoercion should not apply to ternary expressions #11581
That issue was marked as accepting prs
Steps in Contributing were taken

Overview

Report this case when ignoreBooleanCoercion is true:

declare const a: string | true | undefined;
declare const b: string | boolean | undefined;
const x = Boolean(a ? a : b);

but do not report this case:

declare const a: string | true | undefined;
declare const b: string | boolean | undefined;
declare const c: string | boolean | undefined;
const x = Boolean(c || (a ? a : b));

typescript-eslint · 2025-09-18T07:19:05Z

Thanks for the PR, @mdm317!

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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nx-cloud · 2025-09-18T07:20:28Z

View your CI Pipeline Execution ↗ for commit 2654b6b

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☁️ Nx Cloud last updated this comment at 2025-09-23 15:13:05 UTC

codecov · 2025-09-18T07:31:13Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.93%. Comparing base (c198052) to head (2654b6b).
⚠️ Report is 14 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11614   +/-   ##
=======================================
  Coverage   90.93%   90.93%           
=======================================
  Files         506      506           
  Lines       51370    51373    +3     
  Branches     8476     8478    +2     
=======================================
+ Hits        46711    46714    +3     
  Misses       4646     4646           
  Partials       13       13

Flag	Coverage Δ
unittest	`90.93% <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
...lint-plugin/src/rules/prefer-nullish-coalescing.ts	`98.27% <100.00%> (+<0.01%)`	⬆️

🚀 New features to boost your workflow:

❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
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JoshuaKGoldberg

Nice, thanks! 🚀

@thebolarin

| datasource | package | from | to | | ---------- | -------------------------------- | ------ | ------ | | npm | @typescript-eslint/eslint-plugin | 8.44.1 | 8.45.0 | | npm | @typescript-eslint/parser | 8.44.1 | 8.45.0 | ## [v8.45.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8450-2025-09-29) ##### 🚀 Features - **eslint-plugin:** expose rule name via RuleModule interface ([#11616](typescript-eslint/typescript-eslint#11616)) ##### 🩹 Fixes - **eslint-plugin:** \[prefer-nullish-coalescing] ignoreBooleanCoercion should not apply to top-level ternary expressions ([#11614](typescript-eslint/typescript-eslint#11614)) - **eslint-plugin:** \[no-base-to-string] check if superclass is ignored ([#11617](typescript-eslint/typescript-eslint#11617)) ##### ❤️ Thank You - mdm317 - Moses Odutusin [@thebolarin](https://github.com/thebolarin) - Yukihiro Hasegawa [@y-hsgw](https://github.com/y-hsgw) 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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report only when ternary is top-level inside Boolean

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Merge branch 'main' into fix-11581

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mdm317 marked this pull request as ready for review September 23, 2025 15:13

JoshuaKGoldberg approved these changes Sep 29, 2025

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JoshuaKGoldberg merged commit 967764e into typescript-eslint:main Sep 29, 2025
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chrisbbreuer mentioned this pull request Sep 29, 2025

chore(deps): update all non-major dependencies stacksjs/eslint-plugin#64

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ArnaudBarre added a commit to ArnaudBarre/tsl that referenced this pull request Oct 1, 2025

Add test from typescript-eslint/typescript-eslint#11614

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chrisbbreuer mentioned this pull request Oct 4, 2025

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

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chore(deps-dev): bump the dependencies group with 4 updates openfga/js-sdk#263

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Bump @typescript-eslint/eslint-plugin from 8.44.1 to 8.46.0 fossas/fossa-action#220

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fix(eslint-plugin): [prefer-nullish-coalescing] ignoreBooleanCoercion should not apply to top-level ternary expressions #11614

fix(eslint-plugin): [prefer-nullish-coalescing] ignoreBooleanCoercion should not apply to top-level ternary expressions #11614

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fix(eslint-plugin): [prefer-nullish-coalescing] ignoreBooleanCoercion should not apply to top-level ternary expressions #11614

fix(eslint-plugin): [prefer-nullish-coalescing] ignoreBooleanCoercion should not apply to top-level ternary expressions #11614

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