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Expert skill for building high-performance native executables from Java applications using GraalVM Native Image, dramatically reducing startup time and memory consumption.

Write and review React Native component tests using Testing Library v13 and v14. \n \n Covers render patterns, screen queries (getBy/getAllBy/queryBy/findBy variants), Jest matchers, userEvent interactions, fireEvent, and async patterns with version-specific behavior \n Automatically detects your project's RNTL version (v13 for React 18, v14 for React 19+) and applies correct API signatures and sync/async rules \n Provides query priority guidance (getByRole first), interaction best practices (us

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Add @storybook/react-native v10 to a React Native project.

Cross-platform mobile apps with React Native styling, navigation, and performant Reanimated animations. \n \n Covers StyleSheet patterns, dynamic styling, Flexbox layouts, and platform-specific designs for iOS and Android \n Includes React Navigation 6+ setup for stack and tab navigators with type-safe route definitions \n Provides Reanimated 3 fundamentals including shared values, animated styles, and Gesture Handler integration for drag interactions \n Features best practices for performance (

Guidelines for building high-quality Expo React Native applications with JavaScript, focusing on clean code, modularity, and performance.

Network requests, API calls, and data fetching for Expo apps with caching, error handling, and offline support. \n \n Covers fetch API, React Query, error handling patterns, token management with expo-secure-store, and retry logic with exponential backoff \n Includes offline-first strategies using NetInfo and React Query persistence, plus environment variable configuration with EXPO_PUBLIC_ prefix for client-side URLs \n Supports Expo Router data loaders ( useLoaderData ) for route-level data lo

Create robust cross-platform mobile applications using React Native with modern development patterns including navigation, state management, API integration, and native module handling.

Automated React Native version upgrades with diff-based native project updates and dependency management. \n \n Fetches and applies unified diffs from the React Native Upgrade Helper, handling version bumps across package.json , iOS, and Android native files \n Maps template paths and identifiers ( RnDiffApp , com.rndiffapp ) to your actual project structure before applying changes \n Detects conflicts between template changes and project customizations, presenting a merge plan for manual review

Cross-platform native interoperability for Flutter apps on Android, iOS, and Web. \n \n Provides decision logic to select the optimal integration strategy: FFI for C/C++ code, Platform Channels for OS-specific APIs, Platform Views for native UI components, and JS Interop for web \n Implements modern FFI architecture using build hooks (Flutter 3.38+) with native toolchain compilation and Dart bindings \n Supports asynchronous Platform Channels (MethodChannel) with complete Kotlin and Swift implem