@posthog/ai
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PostHog Node.js AI integrations
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{"version":3,"file":"index.mjs","sources":["../../src/utils.ts","../../src/typeGuards.ts","../../src/sanitization.ts","../../src/vercel/middleware.ts"],"sourcesContent":["import { PostHog } from 'posthog-node'\nimport { Buffer } from 'buffer'\nimport OpenAIOrignal from 'openai'\nimport AnthropicOriginal from '@anthropic-ai/sdk'\nimport type { ChatCompletionTool } from 'openai/resources/chat/completions'\nimport type { Tool as GeminiTool } from '@google/genai'\nimport type { FormattedMessage, FormattedContent, TokenUsage } from './types'\n\ntype ChatCompletionCreateParamsBase = OpenAIOrignal.Chat.Completions.ChatCompletionCreateParams\ntype MessageCreateParams = AnthropicOriginal.Messages.MessageCreateParams\ntype ResponseCreateParams = OpenAIOrignal.Responses.ResponseCreateParams\ntype AnthropicTool = AnthropicOriginal.Tool\n\n// limit large outputs by truncating to 200kb (approx 200k bytes)\nexport const MAX_OUTPUT_SIZE = 200000\nconst STRING_FORMAT = 'utf8'\n\nexport interface MonitoringParams {\n posthogDistinctId?: string\n posthogTraceId?: string\n posthogProperties?: Record<string, any>\n posthogPrivacyMode?: boolean\n posthogGroups?: Record<string, any>\n posthogModelOverride?: string\n posthogProviderOverride?: string\n posthogCostOverride?: CostOverride\n posthogCaptureImmediate?: boolean\n}\n\nexport interface CostOverride {\n inputCost: number\n outputCost: number\n}\n\nexport const getModelParams = (\n params: ((ChatCompletionCreateParamsBase | MessageCreateParams | ResponseCreateParams) & MonitoringParams) | null\n): Record<string, any> => {\n if (!params) {\n return {}\n }\n const modelParams: Record<string, any> = {}\n const paramKeys = [\n 'temperature',\n 'max_tokens',\n 'max_completion_tokens',\n 'top_p',\n 'frequency_penalty',\n 'presence_penalty',\n 'n',\n 'stop',\n 'stream',\n 'streaming',\n ] as const\n\n for (const key of paramKeys) {\n if (key in params && (params as any)[key] !== undefined) {\n modelParams[key] = (params as any)[key]\n }\n }\n return modelParams\n}\n\n/**\n * Helper to format responses (non-streaming) for consumption, mirroring Python's openai vs. anthropic approach.\n */\nexport const formatResponse = (response: any, provider: string): FormattedMessage[] => {\n if (!response) {\n return []\n }\n if (provider === 'anthropic') {\n return formatResponseAnthropic(response)\n } else if (provider === 'openai') {\n return formatResponseOpenAI(response)\n } else if (provider === 'gemini') {\n return formatResponseGemini(response)\n }\n return []\n}\n\nexport const formatResponseAnthropic = (response: any): FormattedMessage[] => {\n const output: FormattedMessage[] = []\n const content: FormattedContent = []\n\n for (const choice of response.content ?? []) {\n if (choice?.type === 'text' && choice?.text) {\n content.push({ type: 'text', text: choice.text })\n } else if (choice?.type === 'tool_use' && choice?.name && choice?.id) {\n content.push({\n type: 'function',\n id: choice.id,\n function: {\n name: choice.name,\n arguments: choice.input || {},\n },\n })\n }\n }\n\n if (content.length > 0) {\n output.push({\n role: 'assistant',\n content,\n })\n }\n\n return output\n}\n\nexport const formatResponseOpenAI = (response: any): FormattedMessage[] => {\n const output: FormattedMessage[] = []\n\n if (response.choices) {\n for (const choice of response.choices) {\n const content: FormattedContent = []\n let role = 'assistant'\n\n if (choice.message) {\n if (choice.message.role) {\n role = choice.message.role\n }\n\n if (choice.message.content) {\n content.push({ type: 'text', text: choice.message.content })\n }\n\n if (choice.message.tool_calls) {\n for (const toolCall of choice.message.tool_calls) {\n content.push({\n type: 'function',\n id: toolCall.id,\n function: {\n name: toolCall.function.name,\n arguments: toolCall.function.arguments,\n },\n })\n }\n }\n }\n\n if (content.length > 0) {\n output.push({\n role,\n content,\n })\n }\n }\n }\n\n // Handle Responses API format\n if (response.output) {\n const content: FormattedContent = []\n let role = 'assistant'\n\n for (const item of response.output) {\n if (item.type === 'message') {\n role = item.role\n\n if (item.content && Array.isArray(item.content)) {\n for (const contentItem of item.content) {\n if (contentItem.type === 'output_text' && contentItem.text) {\n content.push({ type: 'text', text: contentItem.text })\n } else if (contentItem.text) {\n content.push({ type: 'text', text: contentItem.text })\n } else if (contentItem.type === 'input_image' && contentItem.image_url) {\n content.push({\n type: 'image',\n image: contentItem.image_url,\n })\n }\n }\n } else if (item.content) {\n content.push({ type: 'text', text: String(item.content) })\n }\n } else if (item.type === 'function_call') {\n content.push({\n type: 'function',\n id: item.call_id || item.id || '',\n function: {\n name: item.name,\n arguments: item.arguments || {},\n },\n })\n }\n }\n\n if (content.length > 0) {\n output.push({\n role,\n content,\n })\n }\n }\n\n return output\n}\n\nexport const formatResponseGemini = (response: any): FormattedMessage[] => {\n const output: FormattedMessage[] = []\n\n if (response.candidates && Array.isArray(response.candidates)) {\n for (const candidate of response.candidates) {\n if (candidate.content && candidate.content.parts) {\n const content: FormattedContent = []\n\n for (const part of candidate.content.parts) {\n if (part.text) {\n content.push({ type: 'text', text: part.text })\n } else if (part.functionCall) {\n content.push({\n type: 'function',\n function: {\n name: part.functionCall.name,\n arguments: part.functionCall.args,\n },\n })\n }\n }\n\n if (content.length > 0) {\n output.push({\n role: 'assistant',\n content,\n })\n }\n } else if (candidate.text) {\n output.push({\n role: 'assistant',\n content: [{ type: 'text', text: candidate.text }],\n })\n }\n }\n } else if (response.text) {\n output.push({\n role: 'assistant',\n content: [{ type: 'text', text: response.text }],\n })\n }\n\n return output\n}\n\nexport const mergeSystemPrompt = (params: MessageCreateParams & MonitoringParams, provider: string): any => {\n if (provider == 'anthropic') {\n const messages = params.messages || []\n if (!(params as any).system) {\n return messages\n }\n const systemMessage = (params as any).system\n return [{ role: 'system', content: systemMessage }, ...messages]\n }\n return params.messages\n}\n\nexport const withPrivacyMode = (client: PostHog, privacyMode: boolean, input: any): any => {\n return (client as any).privacy_mode || privacyMode ? null : input\n}\n\nexport const truncate = (str: string): string => {\n try {\n const buffer = Buffer.from(str, STRING_FORMAT)\n if (buffer.length <= MAX_OUTPUT_SIZE) {\n return str\n }\n const truncatedBuffer = buffer.slice(0, MAX_OUTPUT_SIZE)\n return `${truncatedBuffer.toString(STRING_FORMAT)}... [truncated]`\n } catch (error) {\n console.error('Error truncating, likely not a string')\n return str\n }\n}\n\n/**\n * Extract available tool calls from the request parameters.\n * These are the tools provided to the LLM, not the tool calls in the response.\n */\nexport const extractAvailableToolCalls = (\n provider: string,\n params: any\n): ChatCompletionTool[] | AnthropicTool[] | GeminiTool[] | null => {\n if (provider === 'anthropic') {\n if (params.tools) {\n return params.tools\n }\n\n return null\n } else if (provider === 'gemini') {\n if (params.config && params.config.tools) {\n return params.config.tools\n }\n\n return null\n } else if (provider === 'openai') {\n if (params.tools) {\n return params.tools\n }\n\n return null\n } else if (provider === 'vercel') {\n // Vercel AI SDK stores tools in params.mode.tools when mode type is 'regular'\n if (params.mode?.type === 'regular' && params.mode.tools) {\n return params.mode.tools\n }\n\n return null\n }\n\n return null\n}\n\nexport type SendEventToPosthogParams = {\n client: PostHog\n distinctId?: string\n traceId: string\n model: string\n provider: string\n input: any\n output: any\n latency: number\n baseURL: string\n httpStatus: number\n usage?: TokenUsage\n params: (ChatCompletionCreateParamsBase | MessageCreateParams | ResponseCreateParams) & MonitoringParams\n isError?: boolean\n error?: string\n tools?: ChatCompletionTool[] | AnthropicTool[] | GeminiTool[] | null\n captureImmediate?: boolean\n}\n\nfunction sanitizeValues(obj: any): any {\n if (obj === undefined || obj === null) {\n return obj\n }\n const jsonSafe = JSON.parse(JSON.stringify(obj))\n if (typeof jsonSafe === 'string') {\n return Buffer.from(jsonSafe, STRING_FORMAT).toString(STRING_FORMAT)\n } else if (Array.isArray(jsonSafe)) {\n return jsonSafe.map(sanitizeValues)\n } else if (jsonSafe && typeof jsonSafe === 'object') {\n return Object.fromEntries(Object.entries(jsonSafe).map(([k, v]) => [k, sanitizeValues(v)]))\n }\n return jsonSafe\n}\n\nexport const sendEventToPosthog = async ({\n client,\n distinctId,\n traceId,\n model,\n provider,\n input,\n output,\n latency,\n baseURL,\n params,\n httpStatus = 200,\n usage = {},\n isError = false,\n error,\n tools,\n captureImmediate = false,\n}: SendEventToPosthogParams): Promise<void> => {\n if (!client.capture) {\n return Promise.resolve()\n }\n // sanitize input and output for UTF-8 validity\n const safeInput = sanitizeValues(input)\n const safeOutput = sanitizeValues(output)\n const safeError = sanitizeValues(error)\n\n let errorData = {}\n if (isError) {\n errorData = {\n $ai_is_error: true,\n $ai_error: safeError,\n }\n }\n let costOverrideData = {}\n if (params.posthogCostOverride) {\n const inputCostUSD = (params.posthogCostOverride.inputCost ?? 0) * (usage.inputTokens ?? 0)\n const outputCostUSD = (params.posthogCostOverride.outputCost ?? 0) * (usage.outputTokens ?? 0)\n costOverrideData = {\n $ai_input_cost_usd: inputCostUSD,\n $ai_output_cost_usd: outputCostUSD,\n $ai_total_cost_usd: inputCostUSD + outputCostUSD,\n }\n }\n\n const additionalTokenValues = {\n ...(usage.reasoningTokens ? { $ai_reasoning_tokens: usage.reasoningTokens } : {}),\n ...(usage.cacheReadInputTokens ? { $ai_cache_read_input_tokens: usage.cacheReadInputTokens } : {}),\n ...(usage.cacheCreationInputTokens ? { $ai_cache_creation_input_tokens: usage.cacheCreationInputTokens } : {}),\n }\n\n const properties = {\n $ai_provider: params.posthogProviderOverride ?? provider,\n $ai_model: params.posthogModelOverride ?? model,\n $ai_model_parameters: getModelParams(params),\n $ai_input: withPrivacyMode(client, params.posthogPrivacyMode ?? false, safeInput),\n $ai_output_choices: withPrivacyMode(client, params.posthogPrivacyMode ?? false, safeOutput),\n $ai_http_status: httpStatus,\n $ai_input_tokens: usage.inputTokens ?? 0,\n $ai_output_tokens: usage.outputTokens ?? 0,\n ...additionalTokenValues,\n $ai_latency: latency,\n $ai_trace_id: traceId,\n $ai_base_url: baseURL,\n ...params.posthogProperties,\n ...(distinctId ? {} : { $process_person_profile: false }),\n ...(tools ? { $ai_tools: tools } : {}),\n ...errorData,\n ...costOverrideData,\n }\n\n const event = {\n distinctId: distinctId ?? traceId,\n event: '$ai_generation',\n properties,\n groups: params.posthogGroups,\n }\n\n if (captureImmediate) {\n // await capture promise to send single event in serverless environments\n await client.captureImmediate(event)\n } else {\n client.capture(event)\n }\n}\n","// Type guards for safer type checking\n\nexport const isString = (value: unknown): value is string => {\n return typeof value === 'string'\n}\n\nexport const isObject = (value: unknown): value is Record<string, unknown> => {\n return value !== null && typeof value === 'object' && !Array.isArray(value)\n}\n","import { isString, isObject } from './typeGuards'\n\nconst REDACTED_IMAGE_PLACEHOLDER = '[base64 image redacted]'\n\n// ============================================\n// Base64 Detection Helpers\n// ============================================\n\nconst isBase64DataUrl = (str: string): boolean => {\n return /^data:([^;]+);base64,/.test(str)\n}\n\nconst isValidUrl = (str: string): boolean => {\n try {\n new URL(str)\n return true\n } catch {\n // Not an absolute URL, check if it's a relative URL or path\n return str.startsWith('/') || str.startsWith('./') || str.startsWith('../')\n }\n}\n\nconst isRawBase64 = (str: string): boolean => {\n // Skip if it's a valid URL or path\n if (isValidUrl(str)) {\n return false\n }\n\n // Check if it's a valid base64 string\n // Base64 images are typically at least a few hundred chars, but we'll be conservative\n return str.length > 20 && /^[A-Za-z0-9+/]+=*$/.test(str)\n}\n\nexport function redactBase64DataUrl(str: string): string\nexport function redactBase64DataUrl(str: unknown): unknown\nexport function redactBase64DataUrl(str: unknown): unknown {\n if (!isString(str)) return str\n\n // Check for data URL format\n if (isBase64DataUrl(str)) {\n return REDACTED_IMAGE_PLACEHOLDER\n }\n\n // Check for raw base64 (Vercel sends raw base64 for inline images)\n if (isRawBase64(str)) {\n return REDACTED_IMAGE_PLACEHOLDER\n }\n\n return str\n}\n\n// ============================================\n// Common Message Processing\n// ============================================\n\ntype ContentTransformer = (item: unknown) => unknown\n\nconst processMessages = (messages: unknown, transformContent: ContentTransformer): unknown => {\n if (!messages) return messages\n\n const processContent = (content: unknown): unknown => {\n if (typeof content === 'string') return content\n\n if (!content) return content\n\n if (Array.isArray(content)) {\n return content.map(transformContent)\n }\n\n // Handle single object content\n return transformContent(content)\n }\n\n const processMessage = (msg: unknown): unknown => {\n if (!isObject(msg) || !('content' in msg)) return msg\n return { ...msg, content: processContent(msg.content) }\n }\n\n // Handle both arrays and single messages\n if (Array.isArray(messages)) {\n return messages.map(processMessage)\n }\n\n return processMessage(messages)\n}\n\n// ============================================\n// Provider-Specific Image Sanitizers\n// ============================================\n\nconst sanitizeOpenAIImage = (item: unknown): unknown => {\n if (!isObject(item)) return item\n\n // Handle image_url format\n if (item.type === 'image_url' && 'image_url' in item && isObject(item.image_url) && 'url' in item.image_url) {\n return {\n ...item,\n image_url: {\n ...item.image_url,\n url: redactBase64DataUrl(item.image_url.url),\n },\n }\n }\n\n return item\n}\n\nconst sanitizeOpenAIResponseImage = (item: unknown): unknown => {\n if (!isObject(item)) return item\n\n // Handle input_image format\n if (item.type === 'input_image' && 'image_url' in item) {\n return {\n ...item,\n image_url: redactBase64DataUrl(item.image_url),\n }\n }\n\n return item\n}\n\nconst sanitizeAnthropicImage = (item: unknown): unknown => {\n if (!isObject(item)) return item\n\n // Handle Anthropic's image format\n if (\n item.type === 'image' &&\n 'source' in item &&\n isObject(item.source) &&\n item.source.type === 'base64' &&\n 'data' in item.source\n ) {\n return {\n ...item,\n source: {\n ...item.source,\n data: REDACTED_IMAGE_PLACEHOLDER,\n },\n }\n }\n\n return item\n}\n\nconst sanitizeGeminiPart = (part: unknown): unknown => {\n if (!isObject(part)) return part\n\n // Handle Gemini's inline data format\n if ('inlineData' in part && isObject(part.inlineData) && 'data' in part.inlineData) {\n return {\n ...part,\n inlineData: {\n ...part.inlineData,\n data: REDACTED_IMAGE_PLACEHOLDER,\n },\n }\n }\n\n return part\n}\n\nconst processGeminiItem = (item: unknown): unknown => {\n if (!isObject(item)) return item\n\n // If it has parts, process them\n if ('parts' in item && item.parts) {\n const parts = Array.isArray(item.parts) ? item.parts.map(sanitizeGeminiPart) : sanitizeGeminiPart(item.parts)\n\n return { ...item, parts }\n }\n\n return item\n}\n\nconst sanitizeLangChainImage = (item: unknown): unknown => {\n if (!isObject(item)) return item\n\n // OpenAI style\n if (item.type === 'image_url' && 'image_url' in item && isObject(item.image_url) && 'url' in item.image_url) {\n return {\n ...item,\n image_url: {\n ...item.image_url,\n url: redactBase64DataUrl(item.image_url.url),\n },\n }\n }\n\n // Direct image with data field\n if (item.type === 'image' && 'data' in item) {\n return { ...item, data: redactBase64DataUrl(item.data) }\n }\n\n // Anthropic style\n if (item.type === 'image' && 'source' in item && isObject(item.source) && 'data' in item.source) {\n return {\n ...item,\n source: {\n ...item.source,\n data: redactBase64DataUrl(item.source.data),\n },\n }\n }\n\n // Google style\n if (item.type === 'media' && 'data' in item) {\n return { ...item, data: redactBase64DataUrl(item.data) }\n }\n\n return item\n}\n\n// Export individual sanitizers for tree-shaking\nexport const sanitizeOpenAI = (data: unknown): unknown => {\n return processMessages(data, sanitizeOpenAIImage)\n}\n\nexport const sanitizeOpenAIResponse = (data: unknown): unknown => {\n return processMessages(data, sanitizeOpenAIResponseImage)\n}\n\nexport const sanitizeAnthropic = (data: unknown): unknown => {\n return processMessages(data, sanitizeAnthropicImage)\n}\n\nexport const sanitizeGemini = (data: unknown): unknown => {\n // Gemini has a different structure with 'parts' directly on items instead of 'content'\n // So we need custom processing instead of using processMessages\n if (!data) return data\n\n if (Array.isArray(data)) {\n return data.map(processGeminiItem)\n }\n\n return processGeminiItem(data)\n}\n\nexport const sanitizeLangChain = (data: unknown): unknown => {\n return processMessages(data, sanitizeLangChainImage)\n}\n","import { wrapLanguageModel } from 'ai'\nimport type {\n LanguageModelV2,\n LanguageModelV2Content,\n LanguageModelV2Middleware,\n LanguageModelV2Prompt,\n LanguageModelV2StreamPart,\n} from '@ai-sdk/provider'\nimport { v4 as uuidv4 } from 'uuid'\nimport { PostHog } from 'posthog-node'\nimport { CostOverride, sendEventToPosthog, truncate, MAX_OUTPUT_SIZE, extractAvailableToolCalls } from '../utils'\nimport { Buffer } from 'buffer'\nimport { redactBase64DataUrl } from '../sanitization'\nimport { isString } from '../typeGuards'\n\ninterface ClientOptions {\n posthogDistinctId?: string\n posthogTraceId?: string\n posthogProperties?: Record<string, any>\n posthogPrivacyMode?: boolean\n posthogGroups?: Record<string, any>\n posthogModelOverride?: string\n posthogProviderOverride?: string\n posthogCostOverride?: CostOverride\n posthogCaptureImmediate?: boolean\n}\n\ninterface CreateInstrumentationMiddlewareOptions {\n posthogDistinctId?: string\n posthogTraceId?: string\n posthogProperties?: Record<string, any>\n posthogPrivacyMode?: boolean\n posthogGroups?: Record<string, any>\n posthogModelOverride?: string\n posthogProviderOverride?: string\n posthogCostOverride?: CostOverride\n posthogCaptureImmediate?: boolean\n}\n\ninterface PostHogInput {\n role: string\n type?: string\n content?:\n | string\n | {\n [key: string]: any\n }\n}\n\nconst mapVercelParams = (params: any): Record<string, any> => {\n return {\n temperature: params.temperature,\n max_output_tokens: params.maxOutputTokens,\n top_p: params.topP,\n frequency_penalty: params.frequencyPenalty,\n presence_penalty: params.presencePenalty,\n stop: params.stopSequences,\n stream: params.stream,\n }\n}\n\nconst mapVercelPrompt = (messages: LanguageModelV2Prompt): PostHogInput[] => {\n // Map and truncate individual content\n const inputs: PostHogInput[] = messages.map((message) => {\n let content: any\n\n // Handle system role which has string content\n if (message.role === 'system') {\n content = [\n {\n type: 'text',\n text: truncate(String(message.content)),\n },\n ]\n } else {\n // Handle other roles which have array content\n if (Array.isArray(message.content)) {\n content = message.content.map((c: any) => {\n if (c.type === 'text') {\n return {\n type: 'text',\n text: truncate(c.text),\n }\n } else if (c.type === 'file') {\n // For file type, check if it's a data URL and redact if needed\n let fileData: string\n\n const contentData: unknown = c.data\n\n if (contentData instanceof URL) {\n fileData = contentData.toString()\n } else if (isString(contentData)) {\n // Redact base64 data URLs and raw base64 to prevent oversized events\n fileData = redactBase64DataUrl(contentData)\n } else {\n fileData = 'raw files not supported'\n }\n\n return {\n type: 'file',\n file: fileData,\n mediaType: c.mediaType,\n }\n } else if (c.type === 'reasoning') {\n return {\n type: 'reasoning',\n text: truncate(c.reasoning),\n }\n } else if (c.type === 'tool-call') {\n return {\n type: 'tool-call',\n toolCallId: c.toolCallId,\n toolName: c.toolName,\n input: c.input,\n }\n } else if (c.type === 'tool-result') {\n return {\n type: 'tool-result',\n toolCallId: c.toolCallId,\n toolName: c.toolName,\n output: c.output,\n isError: c.isError,\n }\n }\n return {\n type: 'text',\n text: '',\n }\n })\n } else {\n // Fallback for non-array content\n content = [\n {\n type: 'text',\n text: truncate(String(message.content)),\n },\n ]\n }\n }\n\n return {\n role: message.role,\n content,\n }\n })\n\n try {\n // Trim the inputs array until its JSON size fits within MAX_OUTPUT_SIZE\n let serialized = JSON.stringify(inputs)\n let removedCount = 0\n // We need to keep track of the initial size of the inputs array because we're going to be mutating it\n const initialSize = inputs.length\n for (let i = 0; i < initialSize && Buffer.byteLength(serialized, 'utf8') > MAX_OUTPUT_SIZE; i++) {\n inputs.shift()\n removedCount++\n serialized = JSON.stringify(inputs)\n }\n if (removedCount > 0) {\n // Add one placeholder to indicate how many were removed\n inputs.unshift({\n role: 'posthog',\n content: `[${removedCount} message${removedCount === 1 ? '' : 's'} removed due to size limit]`,\n })\n }\n } catch (error) {\n console.error('Error stringifying inputs', error)\n return [{ role: 'posthog', content: 'An error occurred while processing your request. Please try again.' }]\n }\n return inputs\n}\n\nconst mapVercelOutput = (result: LanguageModelV2Content[]): PostHogInput[] => {\n const content: any[] = result.map((item) => {\n if (item.type === 'text') {\n return { type: 'text', text: truncate(item.text) }\n }\n if (item.type === 'tool-call') {\n return {\n type: 'tool-call',\n id: item.toolCallId,\n function: {\n name: item.toolName,\n arguments: (item as any).args || JSON.stringify((item as any).arguments || {}),\n },\n }\n }\n if (item.type === 'reasoning') {\n return { type: 'reasoning', text: truncate(item.text) }\n }\n if (item.type === 'file') {\n // Handle files similar to input mapping - avoid large base64 data\n let fileData: string\n if (item.data instanceof URL) {\n fileData = item.data.toString()\n } else if (typeof item.data === 'string') {\n fileData = redactBase64DataUrl(item.data)\n\n // If not redacted and still large, replace with size indicator\n if (fileData === item.data && item.data.length > 1000) {\n fileData = `[${item.mediaType} file - ${item.data.length} bytes]`\n }\n } else {\n fileData = `[binary ${item.mediaType} file]`\n }\n\n return {\n type: 'file',\n name: 'generated_file',\n mediaType: item.mediaType,\n data: fileData,\n }\n }\n if (item.type === 'source') {\n return {\n type: 'source',\n sourceType: item.sourceType,\n id: item.id,\n url: (item as any).url || '',\n title: item.title || '',\n }\n }\n // Fallback for unknown types - try to extract text if possible\n return { type: 'text', text: truncate(JSON.stringify(item)) }\n })\n\n if (content.length > 0) {\n return [\n {\n role: 'assistant',\n content: content.length === 1 && content[0].type === 'text' ? content[0].text : content,\n },\n ]\n }\n // otherwise stringify and truncate\n try {\n const jsonOutput = JSON.stringify(result)\n return [{ content: truncate(jsonOutput), role: 'assistant' }]\n } catch (error) {\n console.error('Error stringifying output')\n return []\n }\n}\n\nconst extractProvider = (model: LanguageModelV2): string => {\n const provider = model.provider.toLowerCase()\n const providerName = provider.split('.')[0]\n return providerName\n}\n\nexport const createInstrumentationMiddleware = (\n phClient: PostHog,\n model: LanguageModelV2,\n options: CreateInstrumentationMiddlewareOptions\n): LanguageModelV2Middleware => {\n const middleware: LanguageModelV2Middleware = {\n wrapGenerate: async ({ doGenerate, params }) => {\n const startTime = Date.now()\n const mergedParams = {\n ...options,\n ...mapVercelParams(params),\n }\n const availableTools = extractAvailableToolCalls('vercel', params)\n\n try {\n const result = await doGenerate()\n const modelId =\n options.posthogModelOverride ?? (result.response?.modelId ? result.response.modelId : model.modelId)\n const provider = options.posthogProviderOverride ?? extractProvider(model)\n const baseURL = '' // cannot currently get baseURL from vercel\n const content = mapVercelOutput(result.content)\n const latency = (Date.now() - startTime) / 1000\n const providerMetadata = result.providerMetadata\n const additionalTokenValues = {\n ...(providerMetadata?.anthropic\n ? {\n cacheCreationInputTokens: providerMetadata.anthropic.cacheCreationInputTokens,\n }\n : {}),\n }\n const usage = {\n inputTokens: result.usage.inputTokens,\n outputTokens: result.usage.outputTokens,\n reasoningTokens: result.usage.reasoningTokens,\n cacheReadInputTokens: result.usage.cachedInputTokens,\n ...additionalTokenValues,\n }\n await sendEventToPosthog({\n client: phClient,\n distinctId: options.posthogDistinctId,\n traceId: options.posthogTraceId ?? uuidv4(),\n model: modelId,\n provider: provider,\n input: options.posthogPrivacyMode ? '' : mapVercelPrompt(params.prompt),\n output: content,\n latency,\n baseURL,\n params: mergedParams as any,\n httpStatus: 200,\n usage,\n tools: availableTools,\n captureImmediate: options.posthogCaptureImmediate,\n })\n\n return result\n } catch (error: any) {\n const modelId = model.modelId\n await sendEventToPosthog({\n client: phClient,\n distinctId: options.posthogDistinctId,\n traceId: options.posthogTraceId ?? uuidv4(),\n model: modelId,\n provider: model.provider,\n input: options.posthogPrivacyMode ? '' : mapVercelPrompt(params.prompt),\n output: [],\n latency: 0,\n baseURL: '',\n params: mergedParams as any,\n httpStatus: error?.status ? error.status : 500,\n usage: {\n inputTokens: 0,\n outputTokens: 0,\n },\n isError: true,\n error: truncate(JSON.stringify(error)),\n tools: availableTools,\n captureImmediate: options.posthogCaptureImmediate,\n })\n throw error\n }\n },\n\n wrapStream: async ({ doStream, params }) => {\n const startTime = Date.now()\n let generatedText = ''\n let reasoningText = ''\n let usage: {\n inputTokens?: number\n outputTokens?: number\n reasoningTokens?: any\n cacheReadInputTokens?: any\n cacheCreationInputTokens?: any\n } = {}\n const mergedParams = {\n ...options,\n ...mapVercelParams(params),\n }\n\n const modelId = options.posthogModelOverride ?? model.modelId\n const provider = options.posthogProviderOverride ?? extractProvider(model)\n const availableTools = extractAvailableToolCalls('vercel', params)\n const baseURL = '' // cannot currently get baseURL from vercel\n\n try {\n const { stream, ...rest } = await doStream()\n const transformStream = new TransformStream<LanguageModelV2StreamPart, LanguageModelV2StreamPart>({\n transform(chunk, controller) {\n // Handle new v5 streaming patterns\n if (chunk.type === 'text-delta') {\n generatedText += chunk.delta\n }\n if (chunk.type === 'reasoning-delta') {\n reasoningText += chunk.delta // New in v5\n }\n if (chunk.type === 'finish') {\n const providerMetadata = chunk.providerMetadata\n const additionalTokenValues = {\n ...(providerMetadata?.anthropic\n ? {\n cacheCreationInputTokens: providerMetadata.anthropic.cacheCreationInputTokens,\n }\n : {}),\n }\n usage = {\n inputTokens: chunk.usage?.inputTokens,\n outputTokens: chunk.usage?.outputTokens,\n reasoningTokens: chunk.usage?.reasoningTokens,\n cacheReadInputTokens: chunk.usage?.cachedInputTokens,\n ...additionalTokenValues,\n }\n }\n controller.enqueue(chunk)\n },\n\n flush: async () => {\n const latency = (Date.now() - startTime) / 1000\n // Build content array similar to mapVercelOutput structure\n const content = []\n if (reasoningText) {\n content.push({ type: 'reasoning', text: truncate(reasoningText) })\n }\n if (generatedText) {\n content.push({ type: 'text', text: truncate(generatedText) })\n }\n\n // Structure output like mapVercelOutput does\n const output =\n content.length > 0\n ? 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