fix(langgraph-js): bump @langchain/langgraph to 1.3.0 and pin langgraph-cli@1.2.1

@langchain/langgraph-api@1.2.1 (pulled transitively by langgraph-cli) imports
STREAM_EVENTS_V3_MODES from @langchain/langgraph/web, which only exists in
1.3.0. The starter's overrides + agent dep were pinning langgraph to 1.2.9,
causing the agent container to crash on startup with a SyntaxError. Bump
the override and the direct pin to 1.3.0, and pin @langchain/langgraph-cli
in the npx invocations so future cross-package drift in the LangChain
ecosystem cannot silently re-break this starter.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: marthakelly

examples/integrations/langgraph-js/agent/package.json

@@ -8,12 +8,12 @@
   "type": "module",
   "main": "index.js",
   "scripts": {
-    "dev": "npx @langchain/langgraph-cli dev --port 8123 --no-browser"
+    "dev": "npx @langchain/langgraph-cli@1.2.1 dev --port 8123 --no-browser"
   },
   "dependencies": {
     "@copilotkit/sdk-js": "1.56.5",
     "@langchain/core": "1.1.41",
-    "@langchain/langgraph": "1.2.9",
+    "@langchain/langgraph": "1.3.0",
     "@langchain/openai": "1.4.4",
     "langchain": "1.3.4"
   },

examples/integrations/langgraph-js/docker/Dockerfile.agent

@@ -15,4 +15,4 @@ RUN npm install
 
 EXPOSE 8123
 
-CMD ["npx", "@langchain/langgraph-cli", "dev", "--host", "0.0.0.0", "--port", "8123", "--no-browser"]
+CMD ["npx", "@langchain/langgraph-cli@1.2.1", "dev", "--host", "0.0.0.0", "--port", "8123", "--no-browser"]

examples/integrations/langgraph-js/package.json

@@ -47,7 +47,7 @@
   },
   "overrides": {
     "@langchain/core": "1.0.1",
-    "@langchain/langgraph": "1.2.9"
+    "@langchain/langgraph": "1.3.0"
   },
   "engines": {
     "node": ">=18.0.0"