# facebook/react · RepoSense Release & Migration Intelligence

> Ships `react@19.3.1` with upstream runtime refinements and. Drop-in upgrade. Migration: None.

## Metadata
- **Repository URL**: https://github.com/facebook/react
- **Primary Package**: `react` (NPM)
- **Categories**: `FRAMEWORK`
- **Latest Version**: `v19.3.1`
- **Semantic Status**: `COMPATIBLE`
- **Bundle Size Impact (unavailable)**: `Size Unavailable`
- **Atom Ingestion Feed**: https://github.com/facebook/react/releases.atom

## The Human Context (Plain-English Pitch)
React is a foundational JavaScript library for building interactive user interfaces out of reusable components. Instead of manually updating the browser DOM whenever application data changes, you declare what the screen should look like for any state, and React efficiently updates only the parts that changed.

## Stage 1 Executive Summary ([Core Change] + [Required Action] + [Migration Effort])
Ships `react@19.3.1` with upstream runtime refinements and. Drop-in upgrade. Migration: None.

## Breaking Changes & Required Actions
- Ships `react@19.3.1` with upstream runtime refinements and stability fixes from `facebook/react`.
- Updates TypeScript declarations and internal module exports for `v19.3.1`.

## Migration Snippet
```ts
npm install react@19.3.1
```

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

## Zero-Noise Release Timeline
- **v19.3.1** (2026-10-14) [COMPATIBLE]: Ships `react@19.3.1` with upstream runtime refinements and. Drop-in upgrade. Migration: None.

## Upgrade & Migration Q&A (GEO Direct Answers)
### Is facebook/react v19.3.1 safe to upgrade in production?
facebook/react v19.3.1 is classified as COMPATIBLE (PATCH release). Ships `react@19.3.1` with upstream runtime refinements and. Drop-in upgrade. Migration: None.

### What breaking changes or compatibility risks exist in facebook/react v19.3.1?
No breaking API changes or peer dependency conflicts are recorded for facebook/react v19.3.1 in the RepoSense compatibility graph.

### What is the bundle size impact of react v19.3.1?
Measured bundle size telemetry is currently unavailable for react v19.3.1; verify build output locally before deploying.

### How do I upgrade react to v19.3.1?
Upgrade react to v19.3.1 by running "npm install react@19.3.1" and applying the migration steps: npm install react@19.3.1