[dinwwwh]

🤖 Generated with Claude Code

https://claude.ai/code/session_01VVaw7RYWCsn8myBE4Rncuq

Test-only. Stryker on main left 3 mutants alive that change output.

• key === 'anyOf' && out.oneOf === undefined → true in mergeNullable. Under this mutant, oneOf: [null, $ref Pet] with Pet = type: [object, null] gains a $ref beside the oneOf. A new assertion pins that the oneOf stays as it is. In 3.1 that oneOf rejects null, because both branches match it, and the 3.0 output keeps that meaning.
• key === 'anyOf' → false / '' in the post-pass. These mutants only let a pair merge when it has exactly 2 branches. anyOf: [null, string, null] then stays a oneOf. dropEqualBranches removes only adjacent repeats, so this needs null on both sides of the branch. A new assertion pins { type: string, nullable: true }.

Both assertions pass on main and fail under the mutants.

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Generated by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[codspeed]

Merging this PR will not alter performance

✅ 29 untouched benchmarks
⏩ 2 skipped benchmarks¹

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_{Comparing claude/project-thread-rixcs1 (ca238b9) with main (d1d2512)}

Footnotes

1. 2 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. ↩

[pullfrog]

✅ No new issues found.

Reviewed changes

• anyOf null-pair pin: adds an assertion that anyOf: [{ type: 'null' }, { type: 'string' }, { type: 'null' }] still merges to { type: 'string', nullable: true }. The null on both sides matters because dropEqualBranches only removes adjacent repeats, so the union keeps 3 branches and the post-pass key === 'anyOf' || branches.length === 2 gate is what lets mergeNullable run.
• oneOf null-pair pin: adds an assertion that oneOf: [{ type: 'null' }, { $ref: Pet }] with Pet = { type: ['object', 'null'] } stays a oneOf, since a oneOf rejects the null that both branches match.

I confirmed both assertions pass on the head commit and hand-mutated the source to verify each targeted mutant fails them: key === 'anyOf' && out.oneOf === undefined → true in mergeNullable, and key === 'anyOf' → false in the post-pass. uncheck on the file passes (oxlint, oxfmt, tsc).

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