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Modern React UI patterns for loading states, error handling, and data fetching. \n \n Covers five core principles: never show stale UI, always surface errors, use optimistic updates, progressive disclosure, and graceful degradation \n Provides decision trees and component patterns for loading indicators, skeleton screens, error states, empty states, and button submission handling \n Includes critical anti-patterns to avoid, such as showing spinners when cached data exists, silently swallowing er

Exhaustive React API research from authoritative sources, not training knowledge. \n \n Spawns six parallel research agents to systematically search React's test files, source code, git history, PRs, issues, and type definitions \n Enforces skepticism mandate: treats source material as sole authority and flags discrepancies between findings and common understanding \n Generates documented research with exact file paths, line numbers, and source links for every claim, code example, and warning \n

Build Expo apps with React Native 0.76-0.82+ and SDK 52-55, navigating mandatory New Architecture, React 19 changes, and 16 documented breaking changes. \n \n Covers React Native 0.82+ where New Architecture is mandatory and legacy architecture completely removed; includes interop layer guidance for 0.76-0.81 migration path \n Addresses 16 specific breaking changes including propTypes removal, forwardRef deprecation, Swift iOS template migration, Metro log forwarding removal, and Chrome debugger

Convert JSON specs into React component trees with type-safe props and state management. \n \n Define catalogs with Zod schemas for component props, then implement components with automatic type safety and validation \n Built-in state management via StateProvider with two-way binding ( $bindState ), conditional rendering, and external store integration (Redux, Zustand, XState) \n Event system with action dispatching, state watchers, and four built-in actions (setState, pushState, removeState, va

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.

Sentry error monitoring, session replay, and tracing for React applications. \n \n Install @sentry/react and initialize via instrument.js (imported first in your entry point) with DSN configuration \n Supports error capture via React 19+ error hooks or ErrorBoundary component for earlier versions \n Includes browser tracing, session replay, and Redux integration; router integrations available for React Router (v4–v7) and TanStack Router \n Source map upload via @sentry/wizard enables readable st

45 performance optimization rules for React and Next.js, organized by impact and category. \n \n Covers 8 rule categories from eliminating waterfalls and bundle optimization (critical) through JavaScript performance and advanced patterns (low priority) \n Each rule includes explanation, before/after code examples, and context to guide automated refactoring and code generation \n Prioritized by impact: waterfalls and bundle size are critical; server-side performance and re-render optimization are

React hooks and components library for async state, reactive watching, lifecycle management, and error handling. \n \n Includes async hooks for state management and callbacks, watch hooks for reactive value tracking, and lifecycle utilities for component mounting \n Provides conditional rendering components (If/Else, Switch/Case) and error-safe hooks with built-in fallback behavior \n Offers advanced features: cross-component event bus, offset-based pagination, and fetch request/response interce

Orchestrates React Native version upgrades with template diffs, dependency resolution, and native platform migration. \n \n Applies canonical rn-diff-purge template diffs to align native iOS and Android configuration with target React Native versions \n Handles package.json dependency updates, CocoaPods and Gradle changes, and breaking API migrations across major and minor version bumps \n Includes Expo SDK upgrade layer for managed Expo projects and post-upgrade verification checklist \n Provid

Full-stack React development with file-based routing, server/client rendering, data loading, and type-safe route modules. \n \n Supports file-based routing with nested routes, dynamic segments, and multiple rendering strategies (SSR, SPA, pre-rendering) \n Handles data loading via loader / clientLoader and mutations via action / clientAction with built-in form handling and optimistic UI \n Includes 10+ reference guides covering routing, data loading, actions, navigation, error boundaries, authen