feat(client)!: remove OpenAI helper from the Node.js SDK

BREAKING CHANGE: use LangChain collector instead

api/client/node/README.md

@@ -122,58 +122,3 @@ Invalidate portal tokens for all or specific subjects.
 ```ts
 await openmeter.portal.invalidateTokens()
 ```
-
-## Helpers
-
-### Vercel AI SDK / Next.js
-
-The OpenAI streaming API used by the Vercel AI SDK doesn't return token usage metadata by default.
-The OpenMeter `createOpenAIStreamCallback` helper function decorates the callback with a `onUsage`
-callback which you can use to report usage to OpenMeter.
-
-```ts
-import OpenAI from 'openai'
-import { OpenAIStream, StreamingTextResponse } from 'ai'
-import { createOpenAIStreamCallback } from '@openmeter/sdk'
-
-export async function POST(req: Request) {
-  const { messages } = await req.json()
-  const model = 'gpt-3.5-turbo'
-
-  const response = await openai.chat.completions.create({
-    model,
-    messages,
-    stream: true,
-  })
-
-  const streamCallbacks = await createOpenAIStreamCallback(
-    {
-      model,
-      prompts: messages.map(({ content }) => content),
-    },
-    {
-      // onToken() => {...}
-      // onFinal() => {...}
-      async onUsage(usage) {
-        try {
-          await openmeter.events.ingest({
-            source: 'my-app',
-            type: 'my-event-type',
-            subject: 'my-customer-id',
-            data: {
-              // Usage is { total_tokens, prompt_tokens, completion_tokens }
-              ...usage,
-              model,
-            },
-          })
-        } catch (err) {
-          console.error('failed to ingest usage', err)
-        }
-      },
-    }
-  )
-
-  const stream = OpenAIStream(response, streamCallbacks)
-  return new StreamingTextResponse(stream)
-}
-```

api/client/node/index.ts

@@ -7,8 +7,6 @@ export { OpenMeterConfig, RequestOptions } from './clients/client.js'
 export { Event, IngestedEvent } from './clients/event.js'
 export { Meter, MeterAggregation, WindowSize } from './clients/meter.js'
 
-export { createOpenAIStreamCallback } from './next.js'
-
 export class OpenMeter {
   public events: EventsClient
   public meters: MetersClient

api/client/node/package.json

@@ -49,10 +49,6 @@
     "current node"
   ],
   "dependencies": {
-    "ai": "^2.2.19",
     "undici": "^5.27.2"
-  },
-  "optionalDependencies": {
-    "js-tiktoken": "^1.0.7"
   }
 }