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Upgrading firebase 12 to 13

Breaking12.19.0 → 13.1.0Breaking3Deprecated1New3Changed11Fixed5Other3

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BreakingUpgrade verdict

3 breaking changes.

In plain terms
  • The old Vertex AI backend option is gone; use AgentPlatformBackend instead, noting its default location is global rather than us-central1.
  • Calls to the template model methods now pass a single request object instead of separate arguments.
  • Message parts now carry an explicit type field, and a new UnknownPart type covers raw or user-provided inputs.
  • These generation settings are unsupported in Gemini 3.x and later models, so they are being phased out.
Must act 4 items need code or config changes

What you must change

Breaking3
Removes deprecated VertexAIBackend and BackendType.VERTEX_AI, updates the default hybrid-in-cloud model to gemini-3.5-flash-lite.
VertexAIBackendBackendType.VERTEX_AIAgentPlatformBackendBackendType.AGENT_PLATFORMgetAIgemini-3.5-flash-lite
13.0.0GitHub ReleaseSummarizedView source
Refactors TemplateGenerativeModel.generateContent and generateContentStream to take a unified TemplateRequest object as the first parameter.
TemplateGenerativeModel.generateContentTemplateGenerativeModel.generateContentStreamTemplateRequestStartTemplateChatParamstemplateIdtemplateVariablestoolConfig
13.0.0GitHub ReleaseSummarizedView source
Refactors Part into a discriminated union with explicit type properties and introduces UnknownPart for raw wire and user inputs.
PartUnknownParttype
13.0.0GitHub ReleaseSummarizedView source

Deprecations to plan for

Deprecated1
Deprecates candidateCount, temperature, topP, topK, presencePenalty and frequencyPenalty in GenerationConfig and LiveGenerationConfig.
candidateCounttemperaturetopPtopKpresencePenaltyfrequencyPenaltyGenerationConfigLiveGenerationConfig
13.0.0GitHub ReleaseSummarizedView source