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anthropic-vertex-ai

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[nalaso/anthropic-vertex-ai](https://github.com/nalaso/anthropic-vertex-ai) is a community provider that uses Anthropic models through Vertex AI to provide language model support for the Vercel AI SDK.

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{"version":3,"sources":["../src/anthropic-vertex-provider.ts","../src/anthropic-messages-language-model.ts","../src/anthropic-error.ts","../src/convert-to-anthropic-messages-prompt.ts","../src/map-anthropic-stop-reason.ts"],"sourcesContent":["import { loadApiKey, loadSetting, withoutTrailingSlash } from '@ai-sdk/provider-utils';\nimport { GoogleAuth, GoogleAuthOptions } from 'google-auth-library';\nimport { AnthropicMessagesLanguageModel } from './anthropic-messages-language-model';\nimport {\n AnthropicMessagesModelId,\n AnthropicMessagesSettings,\n} from './anthropic-messages-settings';\n\nexport interface AnthropicVertexProvider {\n /**\nCreates a model for text generation.\n*/\n (\n modelId: AnthropicMessagesModelId,\n settings?: AnthropicMessagesSettings,\n ): AnthropicMessagesLanguageModel;\n\n /**\nCreates a model for text generation.\n*/\n languageModel(\n modelId: AnthropicMessagesModelId,\n settings?: AnthropicMessagesSettings,\n ): AnthropicMessagesLanguageModel;\n\n /**\nCreates a model for text generation.\n*/\n chat(\n modelId: AnthropicMessagesModelId,\n settings?: AnthropicMessagesSettings,\n ): AnthropicMessagesLanguageModel;\n}\n\nexport interface AnthropicVertexProviderSettings {\n /**\nYour Google Vertex region. Defaults to the environment variable `GOOGLE_VERTEX_REGION`.\n */\n region?: string;\n\n /**\nYour Google Vertex project. Defaults to the environment variable `GOOGLE_VERTEX_PROJECT_ID`.\n */\n projectId?: string;\n\n /**\n Optional. The Authentication options provided by google-auth-library.\nComplete list of authentication options is documented in the\nGoogleAuthOptions interface:\nhttps://github.com/googleapis/google-auth-library-nodejs/blob/main/src/auth/googleauth.ts.\n */\n googleAuth?: GoogleAuth;\n\n /**\nUse a different URL prefix for API calls, e.g. to use proxy servers.\nThe default prefix is `https://api.anthropic.com/v1`.\n */\n baseURL?: string;\n\n /**\nAPI key that is being send using the `x-api-key` header.\nIt defaults to the `ANTHROPIC_API_KEY` environment variable.\n */\n apiKey?: string;\n\n /**\nCustom headers to include in the requests.\n */\n headers?: Record<string, string>;\n\n /**\nCustom fetch implementation. You can use it as a middleware to intercept requests,\nor to provide a custom fetch implementation for e.g. testing.\n */\n fetch?: typeof fetch;\n\n generateId?: () => string;\n}\n\n/**\nCreate an Anthropic provider instance.\n */\nexport function createAnthropicVertex(\n options: AnthropicVertexProviderSettings = {},\n): AnthropicVertexProvider {\n\n const getConfig = () => {\n const config = {\n projectId: loadSetting({\n settingValue: options.projectId,\n settingName: 'projectId',\n environmentVariableName: 'GOOGLE_VERTEX_PROJECT_ID',\n description: 'Google Vertex project id',\n }),\n region: loadSetting({\n settingValue: options.region,\n settingName: 'region',\n environmentVariableName: 'GOOGLE_VERTEX_REGION',\n description: 'Google Vertex region',\n }),\n googleAuth: options.googleAuth,\n };\n\n if (!config.region) {\n throw new Error(\n 'No region was given. The client should be instantiated with the `region` option or the `GOOGLE_VERTEX_REGION` environment variable should be set.',\n );\n }\n\n if (!config.projectId) {\n throw new Error(\n 'No project was given. The client should be instantiated with the `projectID` option or the `GOOGLE_VERTEX_PROJECT_ID` environment variable should be set.',\n );\n }\n\n return config;\n }\n\n const createChatModel = (\n modelId: AnthropicMessagesModelId,\n settings: AnthropicMessagesSettings = {},\n ) => {\n \n const config = getConfig();\n\n const baseURL =\n withoutTrailingSlash(options.baseURL) ??\n `https://${config.region}-aiplatform.googleapis.com/v1`;\n\n const auth =\n options.googleAuth ?? new GoogleAuth({ scopes: 'https://www.googleapis.com/auth/cloud-platform' });\n\n return new AnthropicMessagesLanguageModel(modelId, settings, {\n provider: 'anthropic.messages',\n baseURL,\n headers: () => ({\n ...options.headers\n }),\n fetch: options.fetch,\n projectId: config.projectId,\n region: config.region,\n googleAuth: auth\n });\n }\n\n const provider = function (\n modelId: AnthropicMessagesModelId,\n settings?: AnthropicMessagesSettings,\n ) {\n if (new.target) {\n throw new Error(\n 'The Anthropic model function cannot be called with the new keyword.',\n );\n }\n\n return createChatModel(modelId, settings);\n };\n\n provider.languageModel = createChatModel;\n provider.chat = createChatModel;\n\n return provider as AnthropicVertexProvider;\n}\n\n/**\nDefault Anthropic provider instance.\n */\nexport const anthropicVertex = createAnthropicVertex();","import {\n LanguageModelV1,\n LanguageModelV1CallWarning,\n LanguageModelV1FinishReason,\n LanguageModelV1FunctionToolCall,\n LanguageModelV1StreamPart,\n UnsupportedFunctionalityError,\n} from '@ai-sdk/provider';\nimport {\n ParseResult,\n combineHeaders,\n createEventSourceResponseHandler,\n createJsonResponseHandler,\n postJsonToApi,\n} from '@ai-sdk/provider-utils';\nimport { z } from 'zod';\nimport { anthropicFailedResponseHandler } from './anthropic-error';\nimport {\n AnthropicMessagesModelId,\n AnthropicMessagesSettings,\n} from './anthropic-messages-settings';\nimport { convertToAnthropicMessagesPrompt } from './convert-to-anthropic-messages-prompt';\nimport { mapAnthropicStopReason } from './map-anthropic-stop-reason';\nimport { GoogleAuth } from 'google-auth-library';\n\ntype AnthropicMessagesConfig = {\n provider: string;\n baseURL: string;\n headers: () => Record<string, string | undefined>;\n fetch?: typeof fetch;\n projectId?: string;\n region?: string;\n googleAuth?: GoogleAuth;\n};\n\nexport class AnthropicMessagesLanguageModel implements LanguageModelV1 {\n readonly specificationVersion = 'v1';\n readonly defaultObjectGenerationMode = 'tool';\n readonly supportsImageUrls = false;\n readonly defaultVersion = 'vertex-2023-10-16';\n\n readonly modelId: AnthropicMessagesModelId;\n readonly settings: AnthropicMessagesSettings;\n readonly path: string;\n\n private readonly config: AnthropicMessagesConfig;\n\n constructor(\n modelId: AnthropicMessagesModelId,\n settings: AnthropicMessagesSettings,\n config: AnthropicMessagesConfig,\n ) {\n this.modelId = modelId;\n this.settings = settings;\n this.config = config;\n this.path = `/projects/${config.projectId}/locations/${config.region}/publishers/anthropic/models/${modelId}`;\n }\n\n get provider(): string {\n return this.config.provider;\n }\n\n private async getArgs({\n mode,\n prompt,\n maxTokens,\n temperature,\n topP,\n topK,\n frequencyPenalty,\n presencePenalty,\n stopSequences,\n responseFormat,\n seed,\n }: Parameters<LanguageModelV1['doGenerate']>[0]) {\n const type = mode.type;\n\n const warnings: LanguageModelV1CallWarning[] = [];\n\n if (frequencyPenalty != null) {\n warnings.push({\n type: 'unsupported-setting',\n setting: 'frequencyPenalty',\n });\n }\n\n if (presencePenalty != null) {\n warnings.push({\n type: 'unsupported-setting',\n setting: 'presencePenalty',\n });\n }\n\n if (seed != null) {\n warnings.push({\n type: 'unsupported-setting',\n setting: 'seed',\n });\n }\n\n if (responseFormat != null && responseFormat.type !== 'text') {\n warnings.push({\n type: 'unsupported-setting',\n setting: 'responseFormat',\n details: 'JSON response format is not supported.',\n });\n }\n\n const messagesPrompt = convertToAnthropicMessagesPrompt(prompt);\n\n const baseArgs = {\n anthropic_version: this.defaultVersion,\n // model specific settings:\n top_k: topK ?? this.settings.topK,\n\n // standardized settings:\n max_tokens: maxTokens ?? 4096, // 4096: max model output tokens\n temperature,\n top_p: topP,\n stop_sequences: stopSequences,\n\n // prompt:\n system: messagesPrompt.system,\n messages: messagesPrompt.messages,\n };\n\n switch (type) {\n case 'regular': {\n return {\n args: { ...baseArgs, ...prepareToolsAndToolChoice(mode) },\n warnings,\n };\n }\n\n case 'object-json': {\n throw new UnsupportedFunctionalityError({\n functionality: 'json-mode object generation',\n });\n }\n\n case 'object-tool': {\n const { name, description, parameters } = mode.tool;\n\n return {\n args: {\n ...baseArgs,\n tools: [{ name, description, input_schema: parameters }],\n tool_choice: { type: 'tool', name },\n },\n warnings,\n };\n }\n\n default: {\n const _exhaustiveCheck: never = type;\n throw new Error(`Unsupported type: ${_exhaustiveCheck}`);\n }\n }\n }\n\n async doGenerate(\n options: Parameters<LanguageModelV1['doGenerate']>[0],\n ): Promise<Awaited<ReturnType<LanguageModelV1['doGenerate']>>> {\n const { args, warnings } = await this.getArgs(options);\n\n const authClient = await this.config.googleAuth?.getClient(); \n const authHeaders = await authClient?.getRequestHeaders();\n\n options.headers = { ...authHeaders, ...options.headers };\n\n const specifier = 'rawPredict';\n\n const { responseHeaders, value: response } = await postJsonToApi({\n url: `${this.config.baseURL}${this.path}:${specifier}`,\n headers: combineHeaders(this.config.headers(), options.headers),\n body: args,\n failedResponseHandler: anthropicFailedResponseHandler,\n successfulResponseHandler: createJsonResponseHandler(\n anthropicMessagesResponseSchema,\n ),\n abortSignal: options.abortSignal,\n fetch: this.config.fetch,\n });\n\n const { messages: rawPrompt, ...rawSettings } = args;\n\n // extract text\n let text = '';\n for (const content of response.content) {\n if (content.type === 'text') {\n text += content.text;\n }\n }\n\n // extract tool calls\n let toolCalls: LanguageModelV1FunctionToolCall[] | undefined = undefined;\n if (response.content.some(content => content.type === 'tool_use')) {\n toolCalls = [];\n for (const content of response.content) {\n if (content.type === 'tool_use') {\n toolCalls.push({\n toolCallType: 'function',\n toolCallId: content.id,\n toolName: content.name,\n args: JSON.stringify(content.input),\n });\n }\n }\n }\n\n return {\n text,\n toolCalls,\n finishReason: mapAnthropicStopReason(response.stop_reason),\n usage: {\n promptTokens: response.usage.input_tokens,\n completionTokens: response.usage.output_tokens,\n },\n rawCall: { rawPrompt, rawSettings },\n rawResponse: { headers: responseHeaders },\n warnings,\n };\n }\n\n async doStream(\n options: Parameters<LanguageModelV1['doStream']>[0],\n ): Promise<Awaited<ReturnType<LanguageModelV1['doStream']>>> {\n const { args, warnings } = await this.getArgs(options);\n\n const authClient = await this.config.googleAuth?.getClient(); \n const authHeaders = await authClient?.getRequestHeaders();\n\n options.headers = { ...authHeaders, ...options.headers };\n\n const specifier = 'streamRawPredict';\n\n const { responseHeaders, value: response } = await postJsonToApi({\n url: `${this.config.baseURL}${this.path}:${specifier}`,\n headers: combineHeaders(this.config.headers(), options.headers),\n body: {\n ...args,\n stream: true,\n },\n failedResponseHandler: anthropicFailedResponseHandler,\n successfulResponseHandler: createEventSourceResponseHandler(\n anthropicMessagesChunkSchema,\n ),\n abortSignal: options.abortSignal,\n fetch: this.config.fetch,\n });\n\n const { messages: rawPrompt, ...rawSettings } = args;\n\n let finishReason: LanguageModelV1FinishReason = 'other';\n const usage: { promptTokens: number; completionTokens: number } = {\n promptTokens: Number.NaN,\n completionTokens: Number.NaN,\n };\n\n const toolCallContentBlocks: Record<\n number,\n {\n toolCallId: string;\n toolName: string;\n jsonText: string;\n }\n > = {};\n\n return {\n stream: response.pipeThrough(\n new TransformStream<\n ParseResult<z.infer<typeof anthropicMessagesChunkSchema>>,\n LanguageModelV1StreamPart\n >({\n transform(chunk, controller) {\n if (!chunk.success) {\n controller.enqueue({ type: 'error', error: chunk.error });\n return;\n }\n\n const value = chunk.value;\n\n switch (value.type) {\n case 'ping': {\n return; // ignored\n }\n\n case 'content_block_start': {\n const contentBlockType = value.content_block.type;\n\n switch (contentBlockType) {\n case 'text': {\n return; // ignored\n }\n\n case 'tool_use': {\n toolCallContentBlocks[value.index] = {\n toolCallId: value.content_block.id,\n toolName: value.content_block.name,\n jsonText: '',\n };\n return;\n }\n\n default: {\n const _exhaustiveCheck: never = contentBlockType;\n throw new Error(\n `Unsupported content block type: ${_exhaustiveCheck}`,\n );\n }\n }\n }\n\n case 'content_block_stop': {\n // when finishing a tool call block, send the full tool call:\n if (toolCallContentBlocks[value.index] != null) {\n const contentBlock = toolCallContentBlocks[value.index];\n\n controller.enqueue({\n type: 'tool-call',\n toolCallType: 'function',\n toolCallId: contentBlock.toolCallId,\n toolName: contentBlock.toolName,\n args: contentBlock.jsonText,\n });\n\n delete toolCallContentBlocks[value.index];\n }\n\n return;\n }\n\n case 'content_block_delta': {\n const deltaType = value.delta.type;\n switch (deltaType) {\n case 'text_delta': {\n controller.enqueue({\n type: 'text-delta',\n textDelta: value.delta.text,\n });\n\n return;\n }\n\n case 'input_json_delta': {\n const contentBlock = toolCallContentBlocks[value.index];\n\n controller.enqueue({\n type: 'tool-call-delta',\n toolCallType: 'function',\n toolCallId: contentBlock.toolCallId,\n toolName: contentBlock.toolName,\n argsTextDelta: value.delta.partial_json,\n });\n\n contentBlock.jsonText += value.delta.partial_json;\n\n return;\n }\n\n default: {\n const _exhaustiveCheck: never = deltaType;\n throw new Error(\n `Unsupported delta type: ${_exhaustiveCheck}`,\n );\n }\n }\n }\n\n case 'message_start': {\n usage.promptTokens = value.message.usage.input_tokens;\n usage.completionTokens = value.message.usage.output_tokens;\n return;\n }\n\n case 'message_delta': {\n usage.completionTokens = value.usage.output_tokens;\n finishReason = mapAnthropicStopReason(value.delta.stop_reason);\n return;\n }\n\n case 'message_stop': {\n controller.enqueue({ type: 'finish', finishReason, usage });\n return;\n }\n\n default: {\n const _exhaustiveCheck: never = value;\n throw new Error(`Unsupported chunk type: ${_exhaustiveCheck}`);\n }\n }\n },\n }),\n ),\n rawCall: { rawPrompt, rawSettings },\n rawResponse: { headers: responseHeaders },\n warnings,\n };\n }\n}\n\n// limited version of the schema, focussed on what is needed for the implementation\n// this approach limits breakages when the API changes and increases efficiency\nconst anthropicMessagesResponseSchema = z.object({\n type: z.literal('message'),\n content: z.array(\n z.discriminatedUnion('type', [\n z.object({\n type: z.literal('text'),\n text: z.string(),\n }),\n z.object({\n type: z.literal('tool_use'),\n id: z.string(),\n name: z.string(),\n input: z.unknown(),\n }),\n ]),\n ),\n stop_reason: z.string().optional().nullable(),\n usage: z.object({\n input_tokens: z.number(),\n output_tokens: z.number(),\n }),\n});\n\n// limited version of the schema, focussed on what is needed for the implementation\n// this approach limits breakages when the API changes and increases efficiency\nconst anthropicMessagesChunkSchema = z.discriminatedUnion('type', [\n z.object({\n type: z.literal('message_start'),\n message: z.object({\n usage: z.object({\n input_tokens: z.number(),\n output_tokens: z.number(),\n }),\n }),\n }),\n z.object({\n type: z.literal('content_block_start'),\n index: z.number(),\n content_block: z.discriminatedUnion('type', [\n z.object({\n type: z.literal('text'),\n text: z.string(),\n }),\n z.object({\n type: z.literal('tool_use'),\n id: z.string(),\n name: z.string(),\n }),\n ]),\n }),\n z.object({\n type: z.literal('content_block_delta'),\n index: z.number(),\n delta: z.discriminatedUnion('type', [\n z.object({\n type: z.literal('input_json_delta'),\n partial_json: z.string(),\n }),\n z.object({\n type: z.literal('text_delta'),\n text: z.string(),\n }),\n ]),\n }),\n z.object({\n type: z.literal('content_block_stop'),\n index: z.number(),\n }),\n z.object({\n type: z.literal('message_delta'),\n delta: z.object({ stop_reason: z.string().optional().nullable() }),\n usage: z.object({ output_tokens: z.number() }),\n }),\n z.object({\n type: z.literal('message_stop'),\n }),\n z.object({\n type: z.literal('ping'),\n }),\n]);\n\nfunction prepareToolsAndToolChoice(\n mode: Parameters<LanguageModelV1['doGenerate']>[0]['mode'] & {\n type: 'regular';\n },\n) {\n // when the tools array is empty, change it to undefined to prevent errors:\n const tools = mode.tools?.length ? mode.tools : undefined;\n\n if (tools == null) {\n return { tools: undefined, tool_choice: undefined };\n }\n\n const mappedTools = tools.map(tool => ({\n name: tool.name,\n description: tool.description,\n input_schema: tool.parameters,\n }));\n\n const toolChoice = mode.toolChoice;\n\n if (toolChoice == null) {\n return { tools: mappedTools, tool_choice: undefined };\n }\n\n const type = toolChoice.type;\n\n switch (type) {\n case 'auto':\n return { tools: mappedTools, tool_choice: { type: 'auto' } };\n case 'required':\n return { tools: mappedTools, tool_choice: { type: 'any' } };\n case 'none':\n // Anthropic does not support 'none' tool choice, so we remove the tools:\n return { tools: undefined, tool_choice: undefined };\n case 'tool':\n return {\n tools: mappedTools,\n tool_choice: { type: 'tool', name: toolChoice.toolName },\n };\n default: {\n const _exhaustiveCheck: never = type;\n throw new Error(`Unsupported tool choice type: ${_exhaustiveCheck}`);\n }\n }\n}\n","import { createJsonErrorResponseHandler } from '@ai-sdk/provider-utils';\nimport { z } from 'zod';\n\nconst anthropicErrorDataSchema = z.object({\n type: z.literal('error'),\n error: z.object({\n type: z.string(),\n message: z.string(),\n }),\n});\n\nexport type AnthropicErrorData = z.infer<typeof anthropicErrorDataSchema>;\n\nexport const anthropicFailedResponseHandler = createJsonErrorResponseHandler({\n errorSchema: anthropicErrorDataSchema,\n errorToMessage: data => data.error.message,\n});\n","import {\n LanguageModelV1Message,\n LanguageModelV1Prompt,\n UnsupportedFunctionalityError,\n} from '@ai-sdk/provider';\nimport { convertUint8ArrayToBase64 } from '@ai-sdk/provider-utils';\nimport {\n AnthropicMessage,\n AnthropicMessagesPrompt,\n AnthropicUserMessage,\n} from './anthropic-messages-prompt';\n\nexport function convertToAnthropicMessagesPrompt(\n prompt: LanguageModelV1Prompt,\n): AnthropicMessagesPrompt {\n const blocks = groupIntoBlocks(prompt);\n\n let system: string | undefined = undefined;\n const messages: AnthropicMessage[] = [];\n\n for (let i = 0; i < blocks.length; i++) {\n const block = blocks[i];\n const type = block.type;\n\n switch (type) {\n case 'system': {\n if (system != null) {\n throw new UnsupportedFunctionalityError({\n functionality:\n 'Multiple system messages that are separated by user/assistant messages',\n });\n }\n\n system = block.messages.map(({ content }) => content).join('\\n');\n break;\n }\n\n case 'user': {\n // combines all user and tool messages in this block into a single message:\n const anthropicContent: AnthropicUserMessage['content'] = [];\n\n for (const { role, content } of block.messages) {\n switch (role) {\n case 'user': {\n for (const part of content) {\n switch (part.type) {\n case 'text': {\n anthropicContent.push({ type: 'text', text: part.text });\n break;\n }\n case 'image': {\n if (part.image instanceof URL) {\n // The AI SDK automatically downloads images for user image parts with URLs\n throw new UnsupportedFunctionalityError({\n functionality: 'Image URLs in user messages',\n });\n }\n\n anthropicContent.push({\n type: 'image',\n source: {\n type: 'base64',\n media_type: part.mimeType ?? 'image/jpeg',\n data: convertUint8ArrayToBase64(part.image),\n },\n });\n\n break;\n }\n }\n }\n\n break;\n }\n case 'tool': {\n for (const part of content) {\n anthropicContent.push({\n type: 'tool_result',\n tool_use_id: part.toolCallId,\n content: JSON.stringify(part.result),\n is_error: part.isError,\n });\n }\n\n break;\n }\n default: {\n const _exhaustiveCheck: never = role;\n throw new Error(`Unsupported role: ${_exhaustiveCheck}`);\n }\n }\n }\n\n messages.push({ role: 'user', content: anthropicContent });\n\n break;\n }\n\n case 'assistant': {\n if (block.messages.length > 1) {\n throw new UnsupportedFunctionalityError({\n functionality: 'Multiple assistant messages in block',\n });\n }\n\n const { content } = block.messages[0];\n\n messages.push({\n role: 'assistant',\n content: content.map((part, j) => {\n switch (part.type) {\n case 'text': {\n // trim the last text part if it's the last message in the block\n // because Anthropic does not allow trailing whitespace\n // in pre-filled assistant responses\n if (\n i === blocks.length - 1 &&\n j === block.messages.length - 1\n ) {\n return { type: 'text', text: part.text.trim() };\n }\n\n return { type: 'text', text: part.text };\n }\n case 'tool-call': {\n return {\n type: 'tool_use',\n id: part.toolCallId,\n name: part.toolName,\n input: part.args,\n };\n }\n }\n }),\n });\n\n break;\n }\n\n default: {\n const _exhaustiveCheck: never = type;\n throw new Error(`Unsupported type: ${_exhaustiveCheck}`);\n }\n }\n }\n\n return {\n system,\n messages,\n };\n}\n\ntype SystemBlock = {\n type: 'system';\n messages: Array<LanguageModelV1Message & { role: 'system' }>;\n};\ntype AssistantBlock = {\n type: 'assistant';\n messages: Array<LanguageModelV1Message & { role: 'assistant' }>;\n};\ntype UserBlock = {\n type: 'user';\n messages: Array<LanguageModelV1Message & { role: 'user' | 'tool' }>;\n};\n\nfunction groupIntoBlocks(\n prompt: LanguageModelV1Prompt,\n): Array<SystemBlock | AssistantBlock | UserBlock> {\n const blocks: Array<SystemBlock | AssistantBlock | UserBlock> = [];\n let currentBlock: SystemBlock | AssistantBlock | UserBlock | undefined =\n undefined;\n\n for (const { role, content } of prompt) {\n switch (role) {\n case 'system': {\n if (currentBlock?.type !== 'system') {\n currentBlock = { type: 'system', messages: [] };\n blocks.push(currentBlock);\n }\n\n currentBlock.messages.push({ role, content });\n break;\n }\n case 'assistant': {\n if (currentBlock?.type !== 'assistant') {\n currentBlock = { type: 'assistant', messages: [] };\n blocks.push(currentBlock);\n }\n\n currentBlock.messages.push({ role, content });\n break;\n }\n case 'user': {\n if (currentBlock?.type !== 'user') {\n currentBlock = { type: 'user', messages: [] };\n blocks.push(currentBlock);\n }\n\n currentBlock.messages.push({ role, content });\n break;\n }\n case 'tool': {\n if (currentBlock?.type !== 'user') {\n currentBlock = { type: 'user', messages: [] };\n blocks.push(currentBlock);\n }\n\n currentBlock.messages.push({ role, content });\n break;\n }\n default: {\n const _exhaustiveCheck: never = role;\n throw new Error(`Unsupported role: ${_exhaustiveCheck}`);\n }\n }\n }\n\n return blocks;\n}\n","import { LanguageModelV1FinishReason } from '@ai-sdk/provider';\n\nexport function mapAnthropicStopReason(\n finishReason: string | null | undefined,\n): LanguageModelV1FinishReason {\n switch (finishReason) {\n case 'end_turn':\n case 'stop_sequence':\n return 'stop';\n case 'tool_use':\n return 'tool-calls';\n case 'max_tokens':\n return 'length';\n default:\n return 'other';\n 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