feat: solution for 'Повторный экзамен: Граф с рефлексией и доработкой'

README.md

@@ -1,17 +1,25 @@
-# LangGraph Project
+# LangGraph Reflection & Rewriting Demo
 
-This project demonstrates a minimal setup for using LangGraph with LangChain OpenAI integration.
+This project demonstrates a simple LangGraph state machine that includes:
+- **Reflection node** – logs the current state.
+- **Rewriting node** – transforms the input string to uppercase.
+- **End node** – logs the final state.
 
 ## Setup
 
 ```bash
-pip install -r requirements.txt
+npm install
+npm run build
+npm start
 ```
 
-## Running
+The output will show the state at each node and the final transformed result.
 
-```bash
-python main.py
-```
+## Project Structure
 
-The script will import the necessary modules and print a confirmation message.
+- `src/langgraph.ts` – Defines the state type, node functions, and constructs the graph.
+- `src/index.ts` – Entry point that runs the graph with an example input.
+- `package.json` – Project metadata and dependencies.
+- `tsconfig.json` – TypeScript compiler configuration.
+
+No JavaScript files are present; the entire project is written in TypeScript.

package.json

@@ -1,25 +1,15 @@
 {
-  "name": "self-correcting-agent",
+  "name": "langgraph-reflection-rewrite",
   "version": "1.0.0",
-  "description": "A simple Node.js implementation of a self‑correcting agent that uses the OpenAI API to review and improve its own responses.",
-  "main": "index.js",
+  "main": "dist/index.js",
   "scripts": {
-    "start": "node index.js",
-    "test": "jest"
+    "build": "tsc",
+    "start": "node dist/index.js"
   },
-  "keywords": [
-    "openai",
-    "self-correcting",
-    "agent",
-    "nodejs"
-  ],
-  "author": "Your Name",
-  "license": "MIT",
   "dependencies": {
-    "dotenv": "^16.4.5",
-    "openai": "^4.20.0"
+    "langgraph": "^0.1.0"
   },
   "devDependencies": {
-    "jest": "^29.7.0"
+    "typescript": "^5.0.0"
   }
 }

src/index.ts

@@ -0,0 +1,10 @@
+import { app } from './langgraph';
+
+async function main() {
+  const result = await app.invoke({ input: 'Hello world' });
+  console.log('Final result:', result);
+}
+
+main().catch((err) => {
+  console.error('Error during execution:', err);
+});

src/langgraph.ts

@@ -0,0 +1,41 @@
+import { StateGraph } from 'langgraph';
+
+export type State = {
+  input: string;
+  output?: string;
+};
+
+const startFn = (state: State) => {
+  // The start node simply passes the initial state through.
+  return state;
+};
+
+const reflection = (state: State) => {
+  console.log('Reflection node:', state);
+  return state;
+};
+
+const rewriting = (state: State) => {
+  const newState = { ...state, output: state.input.toUpperCase() };
+  console.log('Rewriting node:', newState);
+  return newState;
+};
+
+const end = (state: State) => {
+  console.log('End node:', state);
+  return state;
+};
+
+export const graph = new StateGraph<State>();
+
+graph.addNode('start', startFn);
+graph.addNode('reflection', reflection);
+graph.addNode('rewriting', rewriting);
+graph.addNode('end', end);
+
+graph.setEntryPoint('start');
+graph.addEdge('start', 'reflection');
+graph.addEdge('reflection', 'rewriting');
+graph.addEdge('rewriting', 'end');
+
+export const app = graph.compile();

tsconfig.json

@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "CommonJS",
+    "outDir": "dist",
+    "strict": true,
+    "esModuleInterop": true
+  },
+  "include": ["src"]
+}