developing-react

From sumik

React 19.x development guide covering internals (rendering, reconciliation, Fiber), design patterns (Container/Presenter, HOC, Render Props, Compound Components), state management (useState to Zustand/TanStack Query, nuqs/Jotai), error handling (ErrorBoundary, React 19 error APIs), accessibility (ARIA, focus management, keyboard navigation, WCAG 2.1 AA), performance optimization (react-doctor, React Compiler, memoization), UI animation patterns (CSS transitions, easing), React Testing Library (RTL queries, interactions, TDD patterns), and Storybook (CSF3, interaction testing, a11y). Use when package.json contains 'react' (without 'next'), or when working on React-specific concerns in any framework. Also covers Storybook story creation, play function interaction tests, and axe-core a11y testing. For Next.js-specific features, use developing-nextjs instead. For E2E testing, use testing-e2e-with-playwright. For general testing methodology, use testing-code.