Upgrading React Native

npx react-native upgrade

{
  "dependencies": {
    "react": "19.2.3",
    "react-native": "0.84.0"
  }
}

npm install

cd ios
pod install
cd ..

buildscript {
    ext {
        buildToolsVersion = "34.0.0"
        minSdkVersion = 24
        compileSdkVersion = 35
        targetSdkVersion = 35
        ndkVersion = "26.1.10909125"
    }
}

# Clear Metro bundler cache
npx react-native start --reset-cache

# Clear iOS build
rm -rf ios/build

# Clear Android build
cd android && ./gradlew clean && cd ..

# Clear node modules
rm -rf node_modules && npm install

# iOS
npx react-native run-ios

# Android
npx react-native run-android

# Minimum Node.js version
node --version  # Must be v22.11+

# Using nvm
nvm install 22
nvm use 22

// Hermes is now the default JavaScript engine
// No action needed unless you want to disable it

:hermes_enabled => false

hermesEnabled=false

# iOS - ios/Podfile
# This is now the default, no action needed
:fabric_enabled => true

# Android - android/gradle.properties
newArchEnabled=true

// TurboCxxModule and CxxModule removed
// Migrate to TurboModules

// Before:
class MyModule : public facebook::xplat::module::CxxModule {
  // ...
};

// After: Use TurboModules with Codegen

// XHRInterceptor - Deprecated
// Use Chrome DevTools Protocol Network domain instead

// Before:
import {XHRInterceptor} from 'react-native/Libraries/Network/XHRInterceptor';

// After: Use CDP or other debugging tools

// android/build.gradle
buildscript {
    ext {
        buildToolsVersion = "34.0.0"
        minSdkVersion = 23  // Increased from 21
        compileSdkVersion = 34
        targetSdkVersion = 34
    }
}

// Enable New Architecture (Fabric + TurboModules)

# ios/Podfile
use_frameworks! :linkage => :static
:fabric_enabled => true

# android/gradle.properties
newArchEnabled=true

# Check current Xcode version
xcodebuild -version

platform :ios, '13.4'  # Or higher as required

<!-- ios/YourApp/Info.plist -->
<key>NSPhotoLibraryUsageDescription</key>
<string>Your description</string>

compileSdkVersion = 35
targetSdkVersion = 35
minSdkVersion = 24  // Check minimum required

distributionUrl=https\://services.gradle.org/distributions/gradle-8.3-all.zip

<!-- android/app/src/main/AndroidManifest.xml -->
<uses-permission android:name="android.permission.INTERNET" />

# Run unit tests
npm test

# Run E2E tests
npm run test:e2e

# Discard all changes
git reset --hard HEAD

# Or rollback to specific commit
git reset --hard <commit-hash>

# Reinstall dependencies
rm -rf node_modules
npm install
cd ios && pod install

{
  "dependencies": {
    "react-native": "0.83.2"  // Specific version, not ^0.83.2
  },
  "resolutions": {
    "react-native": "0.83.2"
  }
}