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React Native upgrades are safest when you treat them as a controlled migration, not a package bump. The work spans JavaScript dependencies, native iOS and Android project files, Expo modules, build tooling, runtime versions, and QA. This guide gives you an evergreen upgrade path that works for bare React Native apps, Expo apps, and production templates.

Most production React Native apps talk to at least one REST API: auth, profiles, feeds, search, orders, payments, media, notifications, analytics, or admin workflows. The important decision is not whether you use Fetch or Axios. The important decision is whether every request goes through a typed, observable, cancellable, and secure API layer.

Memory leaks in React Native usually come from resources that outlive the screen that created them: timers, subscriptions, unresolved requests, sockets, navigation listeners, heavy lists, image caches, and native module handles. The fix is not a single package. It is a repeatable loop: reproduce the leak, profile it in a realistic build, remove the retained reference, and verify that memory returns to a stable baseline.

FlatList is fast when each row is cheap, keys are stable, virtualization is tuned for the screen, and the data layer avoids unnecessary re-renders. It becomes slow when rows contain heavy images, anonymous render functions, unstable item references, eager API calls, and too many mounted views. This guide focuses on practical fixes you can apply to production feeds, chats, catalogs, and marketplace screens.

Continuous integration for React Native should do more than run npm test. A useful pipeline protects every pull request, builds signed release artifacts from clean commits, keeps secrets out of the repository, and makes app store submission repeatable.

Operate Expo updates with explicit runtime compatibility, channels, staged rollout, adoption monitoring, and a recovery strategy for failed JavaScript bundles. This revised guide emphasizes supported APIs, production tradeoffs, and an upgrade-friendly path without tying the advice to a calendar year.

Build React Native chat on Firebase with secure membership rules, paginated messages, optimistic sends, attachment controls, presence tradeoffs, and push notifications. This revised guide emphasizes supported APIs, production tradeoffs, and an upgrade-friendly path without tying the advice to a calendar year.

Combine React Native product UI with an Axmol-powered native game surface only after validating the native view bridge and lifecycle on both platforms. This revised guide emphasizes supported APIs, production tradeoffs, and an upgrade-friendly path without tying the advice to a calendar year.

Configure React Native icons and splash screens from source assets through Expo config plugins or native asset catalogs, then validate the actual store build. This revised guide emphasizes supported APIs, production tradeoffs, and an upgrade-friendly path without tying the advice to a calendar year.

Build a food-delivery app around secure roles, catalog and cart state, idempotent orders, payment boundaries, realtime status, location privacy, and operational tooling. This revised guide emphasizes supported APIs, production tradeoffs, and an upgrade-friendly path without tying the advice to a calendar year.

Fix Metro errors by classifying resolution, cache, transform, monorepo, native dependency, and environment failures before clearing caches blindly. This revised guide emphasizes supported APIs, production tradeoffs, and an upgrade-friendly path without tying the advice to a calendar year.