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fix(noNestedTernary): detect nested ternaries wrapped in parentheses#8086

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ematipico merged 2 commits intobiomejs:mainfrom
matanshavit:fix/8045-noNestedTernary-parentheses
Nov 12, 2025
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fix(noNestedTernary): detect nested ternaries wrapped in parentheses#8086
ematipico merged 2 commits intobiomejs:mainfrom
matanshavit:fix/8045-noNestedTernary-parentheses

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@matanshavit matanshavit commented Nov 12, 2025 •
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AI Assistance Notice

This PR was written primarily with Claude Code. See Contribution Guidelines - AI Assistance.

Summary

Fixes #8045

The noNestedTernary rule now correctly detects nested ternary expressions even when they are wrapped in parentheses.

Previously, the rule would not flag nested ternaries like foo ? (bar ? 1 : 2) : 3 because the parentheses prevented detection.

Test Plan

I added valid and invalid tests with ternary operators in parenthesis.

Docs

Changeset included

Implementation notes

This is a two line change to production code, using consequent.omit_parentheses() in place of consequent.

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changeset-bot Bot commented Nov 12, 2025 •
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🦋 Changeset detected

Latest commit: 2fdaf13

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 13 packages
Name Type
@biomejs/biome Patch
@biomejs/cli-win32-x64 Patch
@biomejs/cli-win32-arm64 Patch
@biomejs/cli-darwin-x64 Patch
@biomejs/cli-darwin-arm64 Patch
@biomejs/cli-linux-x64 Patch
@biomejs/cli-linux-arm64 Patch
@biomejs/cli-linux-x64-musl Patch
@biomejs/cli-linux-arm64-musl Patch
@biomejs/wasm-web Patch
@biomejs/wasm-bundler Patch
@biomejs/wasm-nodejs Patch
@biomejs/backend-jsonrpc Patch

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@github-actions github-actions Bot added A-Linter Area: linter L-JavaScript Language: JavaScript and super languages labels Nov 12, 2025
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codspeed-hq Bot commented Nov 12, 2025 •
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CodSpeed Performance Report

Merging #8086 will not alter performance

Comparing matanshavit:fix/8045-noNestedTernary-parentheses (2fdaf13) with main (5cd3d27)

Summary

✅ 58 untouched
⏩ 95 skipped1

Footnotes

  1. 95 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

@matanshavit matanshavit marked this pull request as ready for review November 12, 2025 16:17
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coderabbitai Bot commented Nov 12, 2025 •
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Walkthrough

This change updates the noNestedTernary lint rule to unwrap surrounding parentheses on the consequent and alternate expressions before checking for nested conditional expressions. The rule now calls omit_parentheses() (or equivalent) when matching JsConditionalExpression, enabling detection of nested ternaries wrapped in parentheses. Tests were expanded with multiple parenthesised and non‑parenthesised nested ternary cases, and a changelog entry documenting the patch release was added. No exported or public API declarations were changed.

Suggested reviewers

  • ematipico
  • dyc3

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)
Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. You can run @coderabbitai generate docstrings to improve docstring coverage.
✅ Passed checks (4 passed)
Check name Status Explanation
Title check ✅ Passed The title accurately and concisely describes the fix: enabling detection of nested ternaries wrapped in parentheses, which is the main change across all files.
Description check ✅ Passed The description clearly explains the problem, solution, test coverage, and implementation approach, all directly relevant to the changeset.
Linked Issues check ✅ Passed The PR successfully addresses issue #8045 by modifying the noNestedTernary rule to detect nested ternaries wrapped in parentheses using omit_parentheses(), with comprehensive test coverage added.
Out of Scope Changes check ✅ Passed All changes are directly within scope: production logic fix, changeset documentation, invalid test cases, and valid test cases for the parenthesised ternary detection feature.
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📒 Files selected for processing (1)
  • .changeset/fix-nested-ternary-parentheses.md (1 hunks)
🚧 Files skipped from review as they are similar to previous changes (1)
  • .changeset/fix-nested-ternary-parentheses.md

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dyc3
dyc3 approved these changes Nov 12, 2025
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Love to see an easy fix

Comment thread .changeset/fix-nested-ternary-parentheses.md Outdated
@ematipico ematipico merged commit 2b41e82 into biomejs:main Nov 12, 2025
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@github-actions github-actions Bot mentioned this pull request Nov 12, 2025
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l0ngvh pushed a commit to l0ngvh/biome that referenced this pull request Dec 21, 2025
@matanshavit @dyc3 @l0ngvh
fix(noNestedTernary): detect nested ternaries wrapped in parentheses (b…
bb289cd 
…iomejs#8086)

Co-authored-by: Carson McManus <[email protected]>
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@dyc3 dyc3 dyc3 approved these changes

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💅 lint/style/noNestedTernary doesn't work with parentheses

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@matanshavit @dyc3 @ematipico