Update package dependencies and refactor GraphRunner

The package dependencies "@langchain/community", "@langchain/core", and "@langchain/openai" have been updated to newer versions. In the GraphRunner code, 'agentState' was refactored into 'schema', and some rewording was applied to comments for clarity. These changes aim to keep the package dependencies up-to-date and improve the readability and management of the code.

Author: nyvyn

package-lock.json

@@ -18,10 +18,10 @@
     "update scripts": "npx npm-check-updates -u"
   },
   "dependencies": {
-    "@langchain/community": "^0.0.46",
-    "@langchain/core": "^0.1.55",
+    "@langchain/community": "^0.0.47",
+    "@langchain/core": "^0.1.57",
     "@langchain/langgraph": "0.0.12",
-    "@langchain/openai": "^0.0.26",
+    "@langchain/openai": "^0.0.28",
     "yaml": "^2.4.1",
     "yargs": "^17.7.2"
   },

package.json

@@ -6,6 +6,7 @@ import { AIMessage, BaseMessage, HumanMessage } from "@langchain/core/messages";
 import { PromptTemplate } from "@langchain/core/prompts";
 import { Runnable, RunnableConfig, RunnableLambda } from "@langchain/core/runnables";
 import { END, StateGraph } from "@langchain/langgraph";
+import { BinaryOperator } from "@langchain/langgraph/dist/channels/binop";
 import { createFunctionCallingExecutor } from "@langchain/langgraph/prebuilt";
 import { Pregel } from "@langchain/langgraph/pregel";
 
@@ -171,21 +172,21 @@ export class GraphRunner extends Runnable<GraphRunnerInput, GraphRunnerOutput> {
             }
         });
 
-        const agentState = {
+        const schema: {
+            messages: {
+                value: BinaryOperator<unknown> | null;
+                default?: () => unknown;
+            }
+        } = {
             messages: {
                 value: (x: BaseMessage[], y: BaseMessage[]) => x.concat(y),
                 default: () => [],
             },
-            viewstate: {
-                value: (x: Record<any, any>, y: Record<any, any>) => ({...x, ...y}),
-                default: () => {
-                },
-            },
         };
 
         // Define a new graph
         const workflow = new StateGraph({
-            channels: agentState,
+            channels: schema,
         });
 
         // Define the nodes
@@ -209,12 +210,12 @@ export class GraphRunner extends Runnable<GraphRunnerInput, GraphRunnerOutput> {
 
         // Define the edges between the nodes
         nodes.forEach((node, index) => {
-            // If this is the first agent, set it as the entry point
+            // If this is the first agent, set it as the entry point.
             if (index === 0) {
                 workflow.setEntryPoint(node.name!);
             }
 
-            // If this is the last node, set it as the finish point
+            // If this is the last node, set it as the finish point.
             if (index === nodes.length - 1) {
                 workflow.setFinishPoint(node.name!);
             }
@@ -247,7 +248,7 @@ export class GraphRunner extends Runnable<GraphRunnerInput, GraphRunnerOutput> {
 
             } else {
 
-                // If not the last node, add the edge to the next node
+                // If not the last node, add the edge to the next node.
                 if (index < nodes.length - 1) {
                     if (node.isExit) {
                         workflow.addEdge(node.name!, END);