developing-react

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React 19.x development guide covering internals (rendering, reconciliation, Fiber), performance optimization (47+ react-doctor rules, memoization, bundle size), UI animation patterns (CSS transitions, easing, hover/touch), and React Testing Library (RTL queries, interactions, TDD patterns). Use when package.json contains 'react' (without 'next'), or when working on React-specific concerns in any framework. For Next.js-specific features (App Router, Server Components, Cache Components), use developing-nextjs instead. For E2E testing with Playwright, use testing-e2e-with-playwright. For general testing methodology, use testing-code.