# langchain-ai/langchainjs · RepoSense Release & Migration Intelligence

> Ships `@langchain/core@langchain@1.6.2` with upstream runt. Drop-in upgrade. Migration: None.

## Metadata
- **Repository URL**: https://github.com/langchain-ai/langchainjs
- **Primary Package**: `@langchain/core` (NPM)
- **Categories**: `AI-FRAMEWORK`, `AI-AGENT`, `BACKEND`
- **Latest Version**: `langchain@1.6.2`
- **Semantic Status**: `COMPATIBLE`
- **Bundle Size Impact (unavailable)**: `Size Unavailable`
- **Atom Ingestion Feed**: https://github.com/langchain-ai/langchainjs/releases.atom

## The Human Context (Plain-English Pitch)
LangChain.js is an orchestration framework for building JavaScript and TypeScript applications powered by large language models. It solves the complexity of chaining prompts, connecting external data sources for RAG, and coordinating multi-step AI workflows across different model providers.

## Stage 1 Executive Summary ([Core Change] + [Required Action] + [Migration Effort])
Ships `@langchain/core@langchain@1.6.2` with upstream runt. Drop-in upgrade. Migration: None.

## Breaking Changes & Required Actions
- Ships `@langchain/core@langchain@1.6.2` with upstream runtime refinements and stability fixes from `langchain-ai/langchainjs`.
- Updates TypeScript declarations and internal module exports for `langchain@1.6.2`.

## Migration Snippet
```ts
npm install @langchain/core@langchain@1.6.2
```

## Ecosystem Compatibility Matrix & Graph Warnings
- **TypeScript 5.x** [`COMPATIBLE`]: Ships standard TypeScript declaration files without type regressions.

## Zero-Noise Release Timeline
- **langchain@1.6.2** (2026-11-05) [COMPATIBLE]: Ships `@langchain/core@langchain@1.6.2` with upstream runt. Drop-in upgrade. Migration: None.

## Upgrade & Migration Q&A (GEO Direct Answers)
### Is langchain-ai/langchainjs langchain@1.6.2 safe to upgrade in production?
langchain-ai/langchainjs langchain@1.6.2 is classified as COMPATIBLE (PATCH release). Ships `@langchain/core@langchain@1.6.2` with upstream runt. Drop-in upgrade. Migration: None.

### What breaking changes or compatibility risks exist in langchain-ai/langchainjs langchain@1.6.2?
No breaking API changes or peer dependency conflicts are recorded for langchain-ai/langchainjs langchain@1.6.2 in the RepoSense compatibility graph.

### What is the bundle size impact of @langchain/core langchain@1.6.2?
Measured bundle size telemetry is currently unavailable for @langchain/core langchain@1.6.2; verify build output locally before deploying.

### How do I upgrade @langchain/core to langchain@1.6.2?
Upgrade @langchain/core to langchain@1.6.2 by running "npm install @langchain/core@langchain@1.6.2" and applying the migration steps: npm install @langchain/core@langchain@1.6.2