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Summary of Changes

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This pull request introduces enhanced flexibility for defining structured output in AI model responses by adding support for standard JSON Schema. Users can now specify the expected format of generated content using the responseJsonSchema field, providing a powerful alternative to the existing responseSchema. This change aims to simplify the integration of AI-generated structured data into applications, aligning with common industry practices for data validation and serialization.

Highlights

• New Feature: responseJsonSchema: Added a new responseJsonSchema field to the GenerationConfig interface, allowing users to define structured output using standard JSON Schema.
• Mutual Exclusivity Validation: Implemented a validation check to ensure that responseJsonSchema and the existing responseSchema cannot be used simultaneously within the same GenerationConfig.
• API Documentation and Types: Updated the API review file and the requests.ts type definitions to include the new responseJsonSchema field and its associated documentation.

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Vertex AI Mock Responses Check ⚠️

A newer major version of the mock responses for Vertex AI unit tests is available. update_vertexai_responses.sh should be updated to clone the latest version of the responses: v16.2

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@rachelsaunders @DellaBitta @hsubox76 This PR introduces a critical bug which makes it impossible to use responseSchema:

    (generationConfig.responseSchema != null ||
      generationConfig.responseJsonSchema != null) &&
    generationConfig.responseMimeType
  ) {
    throw new AIError(
      AIErrorCode.UNSUPPORTED,
      `responseMimeType must be set if responseSchema or responseJsonSchema are set.`
    );
  }

This block should be checking generationConfig.responseMimeType !== "application/json". Additionally this error message should be explicit about the required value.

Thanks, making a PR to fix. Our next planned release is Apr 9. In the short term, users experiencing this problem should roll back to the previous version (12.10.0), or use patch-package or a similar solution and make the code change in the comment above if you need features in 12.11.0.