feat: Bump to LangChain 1.0 and drop community package requirement (#1311)

Author: epietrowicz

packages/ai-providers/server-ai-langchain/__tests__/LangChainProvider.test.ts

@@ -76,12 +76,10 @@ describe('LangChainProvider', () => {
   describe('getAIMetricsFromResponse', () => {
     it('creates metrics with success=true and token usage', () => {
       const mockResponse = new AIMessage('Test response');
-      mockResponse.response_metadata = {
-        tokenUsage: {
-          totalTokens: 100,
-          promptTokens: 50,
-          completionTokens: 50,
-        },
+      mockResponse.usage_metadata = {
+        total_tokens: 100,
+        input_tokens: 50,
+        output_tokens: 50,
       };
 
       const result = LangChainProvider.getAIMetricsFromResponse(mockResponse);

packages/ai-providers/server-ai-langchain/package.json

@@ -43,11 +43,10 @@
   "author": "LaunchDarkly",
   "license": "Apache-2.0",
   "devDependencies": {
-    "@langchain/community": "^0.3.0",
-    "@langchain/core": "^0.3.0",
+    "@langchain/core": "^1.1.41",
     "@launchdarkly/server-sdk-ai": "^0.17.1",
     "@opentelemetry/api": "^1.9.0",
-    "@traceloop/instrumentation-langchain": "^0.22.0",
+    "@traceloop/instrumentation-langchain": "^0.26.0",
     "@trivago/prettier-plugin-sort-imports": "^4.1.1",
     "@types/jest": "^29.5.3",
     "@typescript-eslint/eslint-plugin": "^6.20.0",
@@ -58,19 +57,18 @@
     "eslint-plugin-jest": "^27.6.3",
     "eslint-plugin-prettier": "^5.0.0",
     "jest": "^29.6.1",
-    "langchain": "^0.3.0",
+    "langchain": "^1.3.4",
     "prettier": "^3.0.0",
     "ts-jest": "^29.1.1",
     "tsup": "^8.5.1",
     "typescript": "5.1.6"
   },
   "peerDependencies": {
-    "@langchain/community": "^0.2.0 || ^0.3.0",
-    "@langchain/core": "^0.2.0 || ^0.3.0",
+    "@langchain/core": "^1.0.0",
     "@launchdarkly/server-sdk-ai": "^0.17.0",
     "@opentelemetry/api": "^1.0.0",
-    "@traceloop/instrumentation-langchain": "^0.22.0",
-    "langchain": "^0.2.0 || ^0.3.0"
+    "@traceloop/instrumentation-langchain": "^0.26.0",
+    "langchain": "^1.0.0"
   },
   "peerDependenciesMeta": {
     "@opentelemetry/api": {

packages/ai-providers/server-ai-langchain/src/LangChainProvider.ts

@@ -213,12 +213,11 @@ export class LangChainProvider extends AIProvider {
   static getAIMetricsFromResponse(response: AIMessage): LDAIMetrics {
     // Extract token usage if available
     let usage: LDTokenUsage | undefined;
-    if (response?.response_metadata?.tokenUsage) {
-      const { tokenUsage } = response.response_metadata;
+    if (response?.usage_metadata) {
       usage = {
-        total: tokenUsage.totalTokens || 0,
-        input: tokenUsage.promptTokens || 0,
-        output: tokenUsage.completionTokens || 0,
+        total: response.usage_metadata.total_tokens,
+        input: response.usage_metadata.input_tokens,
+        output: response.usage_metadata.output_tokens,
       };
     }