feat: adds permissive mode for batch API

[pedro-stramantinoli]

This PR is related to this feature.

Basically it should allow to call batch API with header x-batch-validation.
If the header value is permissive, it should expect to receive a field errors with data.
This should NOT cause a breaking change.

For that, if no header is provided, we guarantee that no field errors will be returned.

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Summary by cubic

Adds a permissive mode to the Batch API. When clients send x-batch-validation=permissive, responses can include an errors array for partial failures; without it, the SDK omits errors to preserve the old response shape (no breaking change).

• New Features
  • Forwards custom headers in batch.create (adds PostOptions.headers).
  • Adds optional errors[] to CreateBatchSuccessResponse typing.
  • Strips errors from responses unless permissive mode is used.
  • Adds tests for permissive mode and backward compatibility, plus a mockSuccessWithStatusCode helper.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/resend/resend-node/resend@599

commit: baafc52

[cubic-dev-ai]

3 issues found across 5 files

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[gabrielmfern]

LGTM! But since I made so many changes I think it would be nice to get the eyes of somebody else too