React Native in 2026: The New Architecture Is Default

React Native's "New Architecture" — JSI (JavaScript Interface), Fabric renderer, TurboModules, and Bridgeless mode — is enabled by default in Expo SDK 52 and React Native 0.76+. The notorious bridge bottleneck is gone. Performance is no longer a valid argument against React Native for most apps.

Why Expo in 2026?

Expo is no longer just a managed workflow for beginners. It's the recommended way to build React Native apps, full stop. Expo SDK 52 provides:

• Expo Router v4 — file-based routing with typed routes, universal links, and web support
• EAS Build & Submit — cloud CI/CD for iOS and Android, including automatic App Store submission
• EAS Update — over-the-air JS updates without App Store review (for eligible changes)
• Expo Modules API — write native Swift/Kotlin modules with a clean TypeScript-first API
• DOM Components — render web views inline using the same React component model

Getting Started in 2026

npx create-expo-app@latest MyApp --template blank-typescript
cd MyApp
npx expo start

Expo Router v4 — File-Based Navigation

app/
  _layout.tsx        ← Root layout (Stack navigator)
  index.tsx          ← "/" home screen
  (tabs)/
    _layout.tsx      ← Tab bar layout
    feed.tsx         ← "/feed"
    profile.tsx      ← "/profile"
  product/
    [id].tsx         ← "/product/123" (dynamic route)

// Typed navigation — no route typos
import { router } from "expo-router";
router.push("/product/123");
router.push({ pathname: "/product/[id]", params: { id: "123" } });

New Architecture: What Changes in Practice

• Synchronous native calls — read layout measurements, access native APIs synchronously via JSI. No more async workarounds.
• Concurrent React — Fabric renderer is fully compatible with React 19 concurrent features — Suspense, transitions, and use() all work.
• Faster startup — TurboModules are lazily loaded; only the modules your app actually uses are initialized.

EAS Build Workflow

# One-time setup
npx eas-cli build:configure

# Build for iOS (cloud, no Mac required)
npx eas build --platform ios --profile production

# Submit to App Store
npx eas submit --platform ios

Performance Tips

• Use FlashList (Shopify) instead of FlatList — ~10x faster for long lists
• Offload heavy computation to Worklets via react-native-reanimated
• Use expo-image instead of the built-in Image — better caching and format support
• Enable Hermes (default in 0.76+) — significantly faster JS execution and lower memory