feat: add responseModalities support for Gemini image generation #41
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Add support for the `responseModalities` parameter in Google and VertexAI LLM classes to enable native Gemini image generation models to return images alongside text. Changes: - Add `responseModalities` to `GoogleClientOptions` and `VertexAIClientOptions` types - Pass `responseModalities` to `generationConfig` in `CustomChatGoogleGenerativeAI` - Handle `inlineData` (image) parts in response processing, converting to `image_url` content blocks - Add `responseModalities` to generation config in VertexAI `CustomChatConnection.formatData` This enables models like `gemini-2.5-flash-image` and `gemini-3-pro-image-preview` to generate and return images when `responseModalities: ['TEXT', 'IMAGE']` is set.
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Summary
Add support for the
responseModalitiesparameter in Google and VertexAI LLM classes to enable native Gemini image generation models (gemini-2.5-flash-image,gemini-3-pro-image-preview, etc.) to return images alongside text.Changes
responseModalities?: ('TEXT' | 'IMAGE' | 'AUDIO')[]toGoogleClientOptionsandVertexAIClientOptionstypesresponseModalitiestogenerationConfiginCustomChatGoogleGenerativeAIconstructorinlineData(image) parts in response processing (convertResponseContentToChatGenerationChunkandmapGenerateContentResultToChatResult), converting them toimage_urlcontent blocks with base64 data URLsresponseModalitiesto generation config in VertexAICustomChatConnection.formatDataUsage
Tested Models
gemini-2.5-flash-image- Returns text + PNG imagegemini-3-pro-image-preview- Returns JPEG imageRelated