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Audit UI code against Vercel's Web Interface Guidelines for design and accessibility compliance. \n \n Fetches the latest guidelines from a remote source before each review, ensuring rules stay current \n Accepts file paths or patterns as arguments; prompts for files if none provided \n Outputs findings in a terse file:line format for quick scanning and remediation \n Covers design, accessibility, and UX best practices as defined in the guidelines repository \n

Production-ready React Native patterns with Expo, navigation, offline-first architecture, and native module integration. \n \n Covers Expo Router for file-based navigation, authentication flows with secure token storage, and route protection patterns \n Includes offline-first data sync using React Query with AsyncStorage persistence and online status detection \n Demonstrates native module integration for haptics, biometrics, push notifications, and platform-specific code patterns \n Provides pe

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

React useEffect best practices guide covering when to use Effects and superior alternatives. \n \n Teaches the escape-hatch nature of Effects: use only for synchronizing with external systems, not for derived state, expensive calculations, or user event responses \n Provides a decision tree and quick-reference table mapping common situations (data fetching, state derivation, prop changes) to the correct React pattern \n Covers when NOT to use Effects: transforming data for render, handling user

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 (

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

Effects are an escape hatch from React. They let you synchronize with external systems. If there is no external system involved, you shouldn't need an Effect.

Comprehensive performance optimization guide for React and Next.js applications, maintained by Vercel. Contains 45 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.

React Three Fiber (R3F) is a React renderer for Three.js. Write declarative, component-based 3D scenes using JSX.

Interactive node-based graph visualization and workflow editor for React applications. \n \n Provides built-in node types (default, input, output, group) and edge types (bezier, straight, step, smoothstep) with full customization via custom components \n Includes Handle components for connection points, NodeProps and EdgeProps for typed custom nodes and edges, and EdgeLabelRenderer for interactive labels \n Offers programmatic control through useReactFlow hook for viewport management (fitView, z