3 issues found across 17 files

Confidence score: 4/5

• This PR looks generally safe to merge, with issues that are mostly localized and straightforward to fix rather than broad runtime regressions.
• The highest-impact item is in tests/unit/toFormData.test.js: nest(100) appears to trigger the default maxDepth: 100 guard, so the boundary test is off by one and likely to fail unless adjusted.
• There is a public API consistency gap in lib/core/AxiosError.js versus typings: the new runtime error code should also be declared in index.d.ts to avoid TypeScript consumer mismatch.
• Pay close attention to tests/unit/toFormData.test.js, lib/core/AxiosError.js, and docs/es/pages/advanced/multipart-form-data-format.md - boundary behavior, TS declaration parity, and docs option structure need alignment.

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="docs/es/pages/advanced/multipart-form-data-format.md">

<violation number="1" location="docs/es/pages/advanced/multipart-form-data-format.md:86">
P3: Move `maxDepth` out of the `indexes` sublist so it renders as a top-level `formSerializer` option.</violation>
</file>

<file name="tests/unit/toFormData.test.js">

<violation number="1" location="tests/unit/toFormData.test.js:137">
P2: This boundary case is off by one: `nest(100)` already hits the default `maxDepth: 100` guard, so the test will fail. Use one level less for the success case (or expect an error).</violation>
</file>

<file name="lib/core/AxiosError.js">

<violation number="1" location="lib/core/AxiosError.js:89">
P2: Add the new error code to the TypeScript declaration; the runtime now exposes a public constant that `index.d.ts` does not declare.</violation>
</file>

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1 issue found across 19 files

Confidence score: 5/5

• Low merge risk: this is a single low-severity documentation issue (3/10) with no direct runtime or functional regression indicated.
• In docs/es/pages/advanced/multipart-form-data-format.md, the example should use a multipart request; otherwise formSerializer is ignored, which can mislead readers about correct usage.
• Pay close attention to docs/es/pages/advanced/multipart-form-data-format.md - ensure the request type matches multipart behavior so the example reflects actual formSerializer handling.

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="docs/es/pages/advanced/multipart-form-data-format.md">

<violation number="1" location="docs/es/pages/advanced/multipart-form-data-format.md:90">
P3: Use a multipart request here; otherwise `formSerializer` is ignored and the example is misleading.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}