[PR #8] [MERGED] Modernize project to use LangChain v1 createAgent #8

New Issue

2026-02-16T05:19:17-05:00

yindo commented

2026-02-16 05:19:17 -05:00

📋 Pull Request Information

Original PR: https://github.com/langchain-ai/react-agent-js/pull/8
Author: @christian-bromann
Created: 12/26/2025
Status: ✅ Merged
Merged: 12/29/2025
Merged by: @christian-bromann

Base: main ← Head: cb/update

📝 Commits (1)

2113e87 chore: update project to use createAgent

📊 Changes

23 files changed (+4841 additions, -4813 deletions)

View changed files

📝 .env.example (+29 -10)
➖ .eslintrc.cjs (+0 -61)
📝 .github/assets/studio_ui.png (+0 -0)
📝 .gitignore (+1 -6)
📝 README.md (+150 -206)
➕ eslint.config.ts (+14 -0)
➖ jest.config.js (+0 -18)
📝 langgraph.json (+2 -2)
📝 package.json (+27 -31)
➕ pnpm-lock.yaml (+4311 -0)
➕ src/agent.ts (+54 -0)
➕ src/index.ts (+39 -0)
➕ src/prompts.ts (+53 -0)
➖ src/react_agent/configuration.ts (+0 -32)
➖ src/react_agent/graph.ts (+0 -75)
➖ src/react_agent/prompts.ts (+0 -7)
➖ src/react_agent/tests/integration/graph.int.test.ts (+0 -18)
➖ src/react_agent/tests/unit/graph.test.ts (+0 -3)
➖ src/react_agent/tools.ts (+0 -23)
➖ src/react_agent/utils.ts (+0 -18)

...and 3 more files

📄 Description

This PR completely modernizes the template project by migrating from the deprecated manual ReAct agent implementation to the new LangChain v1 createAgent API.

🎯 Overview

The old implementation used a custom StateGraph with manually wired nodes and edges. This has been replaced with createAgent from langchain, which provides a cleaner, more maintainable approach with built-in middleware support.

✨ What's Changed

Architecture

Replaced custom StateGraph implementation with createAgent from langchain
Simplified project structure: moved from src/react_agent/ to src/
Removed deprecated configuration and utility files

Dependencies

Updated to Zod v4 for tool schemas
Added @langchain/openai for OpenAI model support
Removed @langchain/langgraph direct dependency (now handled internally by createAgent)
Switched from Yarn to pnpm as package manager
Updated Node.js target to v24

Tooling

Migrated from .eslintrc.cjs to modern flat config (eslint.config.ts)
Removed Jest test setup (can be re-added as needed)
Simplified npm scripts

Example Tools

Added 4 example tools with Zod schemas: calculator, get_current_time, get_weather, search_knowledge
Clear patterns for defining tools using the new tool() function

Documentation

Updated README with new API examples and middleware patterns
Updated links to point to current LangChain/LangSmith documentation
Moved static assets to .github/assets/

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/langchain-ai/react-agent-js/pull/8 **Author:** [@christian-bromann](https://github.com/christian-bromann) **Created:** 12/26/2025 **Status:** ✅ Merged **Merged:** 12/29/2025 **Merged by:** [@christian-bromann](https://github.com/christian-bromann) **Base:** `main` ← **Head:** `cb/update` --- ### 📝 Commits (1) - [`2113e87`](https://github.com/langchain-ai/react-agent-js/commit/2113e87f3dd42b461ed7d3f84567d498ba90de28) chore: update project to use createAgent ### 📊 Changes **23 files changed** (+4841 additions, -4813 deletions) <details> <summary>View changed files</summary> 📝 `.env.example` (+29 -10) ➖ `.eslintrc.cjs` (+0 -61) 📝 `.github/assets/studio_ui.png` (+0 -0) 📝 `.gitignore` (+1 -6) 📝 `README.md` (+150 -206) ➕ `eslint.config.ts` (+14 -0) ➖ `jest.config.js` (+0 -18) 📝 `langgraph.json` (+2 -2) 📝 `package.json` (+27 -31) ➕ `pnpm-lock.yaml` (+4311 -0) ➕ `src/agent.ts` (+54 -0) ➕ `src/index.ts` (+39 -0) ➕ `src/prompts.ts` (+53 -0) ➖ `src/react_agent/configuration.ts` (+0 -32) ➖ `src/react_agent/graph.ts` (+0 -75) ➖ `src/react_agent/prompts.ts` (+0 -7) ➖ `src/react_agent/tests/integration/graph.int.test.ts` (+0 -18) ➖ `src/react_agent/tests/unit/graph.test.ts` (+0 -3) ➖ `src/react_agent/tools.ts` (+0 -23) ➖ `src/react_agent/utils.ts` (+0 -18) _...and 3 more files_ </details> ### 📄 Description This PR completely modernizes the template project by migrating from the deprecated manual ReAct agent implementation to the new LangChain v1 `createAgent` API. ### 🎯 Overview The old implementation used a custom `StateGraph` with manually wired nodes and edges. This has been replaced with `createAgent` from `langchain`, which provides a cleaner, more maintainable approach with built-in middleware support. ### ✨ What's Changed **Architecture** - Replaced custom `StateGraph` implementation with `createAgent` from `langchain` - Simplified project structure: moved from `src/react_agent/` to `src/` - Removed deprecated configuration and utility files **Dependencies** - Updated to Zod v4 for tool schemas - Added `@langchain/openai` for OpenAI model support - Removed `@langchain/langgraph` direct dependency (now handled internally by `createAgent`) - Switched from Yarn to pnpm as package manager - Updated Node.js target to v24 **Tooling** - Migrated from `.eslintrc.cjs` to modern flat config (`eslint.config.ts`) - Removed Jest test setup (can be re-added as needed) - Simplified npm scripts **Example Tools** - Added 4 example tools with Zod schemas: `calculator`, `get_current_time`, `get_weather`, `search_knowledge` - Clear patterns for defining tools using the new `tool()` function **Documentation** - Updated README with new API examples and middleware patterns - Updated links to point to current LangChain/LangSmith documentation - Moved static assets to `.github/assets/` --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

yindo added the pull-request label 2026-02-16 05:19:17 -05:00

yindo closed this issue

2026-02-16 05:19:17 -05:00

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Reference: langchain-ai/react-agent-js#8

[PR #8] [MERGED] Modernize project to use LangChain v1 createAgent #8