feat: Support auto-streaming with langchain

packages/langchain/package.json

@@ -39,5 +39,8 @@
     "@sap-cloud-sdk/connectivity": "^4.2.0",
     "@sap-cloud-sdk/util": "^4.2.0",
     "uuid": "^13.0.0"
+  },
+  "devDependencies": {
+    "@langchain/langgraph": "^1.0.7"
   }
 }

packages/langchain/src/openai/__snapshots__/chat.test.ts.snap

@@ -1,5 +1,173 @@
 // Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
 
+exports[`Chat client streaming has langchain handle disabling streaming via disableStreaming flag in stream 1`] = `
+{
+  "id": [
+    "langchain_core",
+    "messages",
+    "AIMessage",
+  ],
+  "kwargs": {
+    "additional_kwargs": {
+      "function_call": undefined,
+      "tool_calls": undefined,
+    },
+    "content": "The capital of France is Paris.",
+    "invalid_tool_calls": [],
+    "response_metadata": {
+      "created": undefined,
+      "finish_reason": undefined,
+      "function_call": undefined,
+      "id": undefined,
+      "index": 0,
+      "model": undefined,
+      "object": undefined,
+      "promptFilterResults": undefined,
+      "tokenUsage": {
+        "completionTokens": 0,
+        "promptTokens": 0,
+        "totalTokens": 0,
+      },
+      "tool_calls": undefined,
+    },
+    "tool_calls": [],
+    "usage_metadata": {
+      "input_tokens": 0,
+      "output_tokens": 0,
+      "total_tokens": 0,
+    },
+  },
+  "lc": 1,
+  "type": "constructor",
+}
+`;
+
+exports[`Chat client streaming supports auto-streaming responses 1`] = `
+{
+  "id": [
+    "langchain_core",
+    "messages",
+    "AIMessageChunk",
+  ],
+  "kwargs": {
+    "additional_kwargs": {},
+    "content": "The capital of France is Paris.",
+    "id": undefined,
+    "invalid_tool_calls": [],
+    "response_metadata": {
+      "completion": 0,
+      "created": 1730125149,
+      "finish_reason": "stop",
+      "id": "chatcmpl-ANKsHIdjvozwuOGpGI6rygvwSJH0I",
+      "index": 0,
+      "model_name": "gpt-4o",
+      "prompt": 0,
+      "system_fingerprint": "fp_808245b034",
+      "token_usage": {
+        "completion_tokens": 7,
+        "prompt_tokens": 14,
+        "total_tokens": 21,
+      },
+    },
+    "tool_call_chunks": [],
+    "tool_calls": [],
+    "usage_metadata": {
+      "input_token_details": {},
+      "input_tokens": 14,
+      "output_token_details": {},
+      "output_tokens": 7,
+      "total_tokens": 21,
+    },
+  },
+  "lc": 1,
+  "type": "constructor",
+}
+`;
+
+exports[`Chat client streaming supports auto-streaming responses via invoke-stream 1`] = `
+{
+  "id": [
+    "langchain_core",
+    "messages",
+    "AIMessageChunk",
+  ],
+  "kwargs": {
+    "additional_kwargs": {},
+    "content": "The capital of France is Paris.",
+    "id": undefined,
+    "invalid_tool_calls": [],
+    "response_metadata": {
+      "completion": 0,
+      "created": 1730125149,
+      "finish_reason": "stop",
+      "id": "chatcmpl-ANKsHIdjvozwuOGpGI6rygvwSJH0I",
+      "index": 0,
+      "model_name": "gpt-4o",
+      "prompt": 0,
+      "system_fingerprint": "fp_808245b034",
+      "token_usage": {
+        "completion_tokens": 7,
+        "prompt_tokens": 14,
+        "total_tokens": 21,
+      },
+    },
+    "tool_call_chunks": [],
+    "tool_calls": [],
+    "usage_metadata": {
+      "input_token_details": {},
+      "input_tokens": 14,
+      "output_token_details": {},
+      "output_tokens": 7,
+      "total_tokens": 21,
+    },
+  },
+  "lc": 1,
+  "type": "constructor",
+}
+`;
+
+exports[`Chat client streaming supports disabling auto-streaming via disableStreaming flag 1`] = `
+{
+  "id": [
+    "langchain_core",
+    "messages",
+    "AIMessage",
+  ],
+  "kwargs": {
+    "additional_kwargs": {
+      "function_call": undefined,
+      "tool_calls": undefined,
+    },
+    "content": "The capital of France is Paris.",
+    "invalid_tool_calls": [],
+    "response_metadata": {
+      "created": undefined,
+      "finish_reason": undefined,
+      "function_call": undefined,
+      "id": undefined,
+      "index": 0,
+      "model": undefined,
+      "object": undefined,
+      "promptFilterResults": undefined,
+      "tokenUsage": {
+        "completionTokens": 0,
+        "promptTokens": 0,
+        "totalTokens": 0,
+      },
+      "tool_calls": undefined,
+    },
+    "tool_calls": [],
+    "usage_metadata": {
+      "input_tokens": 0,
+      "output_tokens": 0,
+      "total_tokens": 0,
+    },
+  },
+  "lc": 1,
+  "type": "constructor",
+}
+`;
+
 exports[`Chat client streaming supports streaming responses 1`] = `
 {
   "id": [