Fix: Issue #94 CallbackManager is deprecated (#165)

Co-authored-by: Jared Palmer <jared@jaredpalmer.com>

.changeset/blue-rice-remember.md

@@ -0,0 +1,5 @@
+---
+'ai': patch
+---
+
+Provider direct callback handlers in LangChain now that `CallbackManager` is deprecated.

docs/pages/docs/api-reference/langchain-stream.mdx

@@ -35,7 +35,6 @@ The `LangChainCallbacks` object has the following properties which are compatibl
 import { StreamingTextResponse, LangChainStream } from 'ai'
 import { ChatOpenAI } from 'langchain/chat_models/openai'
 import { AIChatMessage, HumanChatMessage } from 'langchain/schema'
-import { CallbackManager } from 'langchain/callbacks'
 
 export const runtime = 'edge'
 
@@ -45,7 +44,7 @@ export async function POST(req: Request) {
 
   const llm = new ChatOpenAI({
     streaming: true,
-    callbackManager: CallbackManager.fromHandlers(handlers)
+    callbacks: [handlers]
   })
 
   llm

docs/pages/docs/guides/langchain.mdx

@@ -13,7 +13,6 @@ Here is an example implementation of a chat application that uses both Vercel AI
 
 ```tsx filename="app/api/chat/route.ts" {1,11,15,28}
 import { StreamingTextResponse, LangChainStream, Message } from 'ai'
-import { CallbackManager } from 'langchain/callbacks'
 import { ChatOpenAI } from 'langchain/chat_models/openai'
 import { AIChatMessage, HumanChatMessage } from 'langchain/schema'
 
@@ -26,7 +25,7 @@ export async function POST(req: Request) {
 
   const llm = new ChatOpenAI({
     streaming: true,
-    callbackManager: CallbackManager.fromHandlers(handlers)
+    callbacks: [handlers]
   })
 
   llm

examples/next-langchain/app/api/chat/route.ts

@@ -1,5 +1,4 @@
 import { StreamingTextResponse, LangChainStream, Message } from 'ai'
-import { CallbackManager } from 'langchain/callbacks'
 import { ChatOpenAI } from 'langchain/chat_models/openai'
 import { AIChatMessage, HumanChatMessage } from 'langchain/schema'
 
@@ -12,7 +11,7 @@ export async function POST(req: Request) {
 
   const llm = new ChatOpenAI({
     streaming: true,
-    callbackManager: CallbackManager.fromHandlers(handlers)
+    callbacks: [handlers]
   })
 
   llm

examples/nuxt-langchain/server/api/chat.ts

@@ -1,5 +1,4 @@
 import { LangChainStream, Message, streamToResponse } from 'ai'
-import { CallbackManager } from 'langchain/callbacks'
 import { ChatOpenAI } from 'langchain/chat_models/openai'
 import { AIChatMessage, HumanChatMessage } from 'langchain/schema'
 
@@ -18,7 +17,7 @@ export default defineEventHandler(async (event: any) => {
     const llm = new ChatOpenAI({
       openAIApiKey: process.env.OPENAI_API_KEY,
       streaming: true,
-      callbackManager: CallbackManager.fromHandlers(handlers)
+      callbacks: [handlers]
     })
 
     llm