Advanced concepts in React Native, page 2
Connect React Native Apps to BLE Hardware
react-native-ble-plx is the bridge from your RN app to physical BLE hardware. Use it to scan for, connect to, and exchange data with peripherals like sensors or smart locks, without writing native code.
Inline Requires: Defer JS Loading in React Native
Inline requires are just-in-time loading for code. Instead of loading everything at startup, you pull in modules only when needed, improving initial app speed. This is ideal for heavy components. The footgun: module side effects will execute later.
Profiling React Native on Android with System Tracing
System Tracing helps you find UI jank on Android by showing where time is spent in each 16ms frame. Use it in Android Studio to diagnose stuttering animations by inspecting the UI, JS, and Native Module threads.
Turbo Modules: Type-Safe Native Code in React Native
Turbo Modules let your JS code call native APIs synchronously, skipping the slow async bridge. Use them to access device features or high-performance native libraries.
JSI Host Objects: Exposing C++ to JavaScript
A JSI Host Object is a C++ object exposed directly to your JavaScript runtime, bypassing React Native's slow, serializing bridge. It's used in high-performance native modules like database adapters.
Detox: Gray-Box E2E Testing for React Native
Detox runs gray-box E2E tests by automatically synchronizing with your React Native app's activity. This eliminates flaky sleep() calls. Write one JavaScript test suite for iOS and Android that runs reliably on CI and real devices.
OTA Updates: Ship JS Fixes Without App Store Review
Over-the-Air (OTA) updates let you ship JavaScript, styling, and image changes directly to users, bypassing app store review. Use it to fix JS bugs or tweak UI between releases. The footgun: you can't update native code or change permissions this way.
fastlane for React Native: Automating Native Builds
fastlane automates the native build and release steps for your React Native app. It scripts Xcode and Gradle tasks like code signing and uploading to stores, letting you ship from one command. The footgun: it only automates native toolchains, not JS bundling.
CI/CD for React Native: Automating App Releases
CI/CD for React Native is an assembly line for your app, taming the complexity of managing JS, Android, and iOS code. It automates builds on every push and deploys to stores. The main footgun is storing signing keys directly in your repo instead of using.
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