Introduction

React Native 0.83 is here, bringing React 19.2, enhanced DevTools, and new APIs like Intersection Observer (canary) and stable Web Performance APIs. Best of all, this release introduces no user-facing breaking changes, making it a smooth upgrade. This guide will walk you through upgrading and using the key new features step by step.

What You Need

• A React Native project (version 0.82 or earlier)
• Node.js 18+ installed
• Basic familiarity with npm or yarn
• Optional: access to React Native DevTools for new panels

Step-by-Step Guide

Step 1: Upgrade to React Native 0.83

Run the appropriate upgrade command for your package manager:

• npm: npx react-native upgrade
• yarn: yarn upgrade react-native@0.83.0

If you’re using a monorepo, also update react to 19.2.0 and verify any server dependencies (react-server-dom-webpack, react-server-dom-parcel, react-server-dom-turbopack) are patched to version 19.2.1 to address CVE-2025-55182. Note: React Native itself is not vulnerable, but monorepo setups may need attention.

Step 2: Verify No Breaking Changes

This release has zero user-facing breaking changes. Run your existing tests and check console logs for deprecation warnings. If you see none, you’re good to proceed. The only caution is the CVE mentioned above – skip this step if you’ve already handled server side packages.

Step 3: Use the New <Activity> Component

React 19.2 introduces <Activity>, letting you split your UI into “activities” with controlled visibility. It supports two modes:

• visible – renders children normally, mounts effects.
• hidden – hides children, unmounts effects, and defers all updates until React is idle. State is preserved.

Example: Wrap a search results component in <Activity mode='hidden'> when showing a detail view. When the user returns, the search query and selection remain intact.

import { Activity } from 'react';

<Activity mode={isSearchVisible ? 'visible' : 'hidden'}>
  <SearchResults />
</Activity>

For more details, refer to the React docs.

Step 4: Implement useEffectEvent for Cleaner Side Effects

The new useEffectEvent hook lets you extract event-driven logic from useEffect, avoiding unnecessary re‑runs. This solves the common pattern of notifying app code about external events without triggering effect re‑execution when unrelated values change.

Example: Previously you might write:

useEffect(() => {
  const onConnect = () => console.log(user); // re-runs on user change
  socket.on('connect', onConnect);
}, [user]);

With useEffectEvent:

const onConnect = useEffectEvent(() => {
  console.log(user); // does NOT cause effect re-run
});
useEffect(() => {
  socket.on('connect', onConnect);
}, []); // empty dependency array

Read more in the React docs.

Step 5: Explore New DevTools Features

React Native 0.83 includes two powerful DevTools panels:

• Network panel – inspect all network requests made by your app, view headers, payloads, and timings.
• Performance panel – trace JavaScript and native performance, identify bottlenecks.

Open DevTools (connect to a running app or use Flipper). You’ll see the new tabs automatically. For detailed usage, check the Tips section below.

Step 6: Use Intersection Observer (Canary)

The Intersection Observer API is now available as a canary feature. It lets you efficiently detect when an element becomes visible (or fully visible) in the viewport – useful for lazy loading images, analytics, or infinite scroll.

Enable it by importing IntersectionObserver from 'react-native' (may require enabling in your metro.config.js – see official docs).

Step 7: Implement Web Performance APIs (Stable)

The following performance APIs are now stable and ready for production:

• Performance.now() – measure elapsed time with high precision.
• Performance.mark() and Performance.measure() – create custom timings.
• PerformanceObserver – observe performance entries.

Use them to profile startup times, screen transitions, or any custom metric. They work similarly to browser APIs.

Tips

• Monorepo security: Even though React Native is unaffected, if your repo includes server‑rendering packages, upgrade them immediately to 19.2.1.
• DevTools debugging: After upgrading, if the Network or Performance panels don’t appear, ensure you’re using a recent version of Flipper or the DevTools standalone. You may need to restart both the app and dev tools.
• <Activity> best practices: Use hidden mode for screens you expect the user to return to (e.g., tab views). Avoid it for large, never‑used trees — it still preserves state, which consumes memory.
• Performance monitoring: Combine Performance.mark() with PerformanceObserver to log durations to your analytics service. Remember to clear marks when done.
• Intersection Observer: Since it’s canary, use it experimentally. Plan to remove it if the API changes before stabilization.