Live Dev Session: React Native 0.81 Is Here! Faster Builds, API Changes, and What You Need to Know
Featuring
This week’s livestream was all about turbocharged builds, smarter tooling, and developer-first upgrades. Our main spotlight: React Native 0.81 landed, and with it came precompiled iOS builds that radically accelerate your workflow. We also covered build housekeeping, tooling perks, and a few tech news gems worth sharing.
React Native 0.81: A Leap Forward in iOS Development
React Native 0.81 is a performance game changer, especially for iOS builds.
Precompiled iOS Builds
- Built-in support for precompiled iOS binaries: React Native now ships an
ReactNativeDependencies.xcframeworkcontaining compiled native dependencies like Folly, Glog, DoubleConversion, and the React call invoker. - This results in dramatic speed ups: in benchmarks on Apple Silicon (M4), builds were ~8.3× faster—going from ~147s down to ~18s.
- In our own tests:
- Fresh RN project: 200s → 20s
- With Reanimated: 70s
- The feature is experimental but promising. To enable it, use the environment flags when installing pods:
ENV['RCT_USE_RN_DEP'] = '1'
ENV['RCT_USE_PREBUILT_RNCORE'] = '1'- The heavy lifting is handled by CocoaPods switching to the binary under the hood; no major Podfile rewrites needed.
Why this matters
- Build times slashed: whether for local dev, CI/CD, or new machines, save serious time.
- Consistent results across environments: reducing flaky native builds.
- Better dev experience: faster iteration, fewer interruptions, and smoother onboarding.
Other React Native 0.81 Highlights
- Android 16 (API 36) is now the default: edge-to-edge rendering is required, and predictive back gestures are enabled by default.
<SafeAreaView>is deprecated: migrate toreact-native-safe-area-context.- JavaScriptCore (JSC) support removed from core: apps that need JSC must now install the community-maintained package from Expo & Callstack. Hermes remains unaffected.
- Minimum requirements bumped: Node.js v20.19.4+, Xcode 16.1+, and updated Metro bundler configs.
Other highlights from the live dev session
- Managing Xcode versions like a pro: We explored Xcodes: a CLI/GUI tool that lets you install and switch Xcode versions effortlessly. Perfect for multi-version workflows.
- Why older color choices still haunt the web today: A UI decision from five years ago still shapes modern design palettes → Adam Wathan’s post.
- Trademark humor in action
- “Why did Oracle bring an attorney to defend “JavaScript” at the TTAB? Because they heard that without representation, things might get null and void”
- The joke underscores the Oracle vs. Deno trademark dispute over “JavaScript” → read more.
- GitHub joins Microsoft’s CoreAI team —No longer a separate company, GitHub is now part of CoreAI. Expect deeper AI integrations soon → The Verge article.
Catch the full livestream replay for demos, build comparisons, and a behind-the-scenes look at setting up precompiled iOS builds.
