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Frontend Mastery

frontend_mastery

Advanced React patterns, performance optimization, and state management rules.

majiayu000/claude-skill-registry0installs663stars

SKILL.md

Full skill instructions

Frontend Mastery Protocol (React + Vite + Tailwind)

1. Performance "Pro" Checklist

Before submitting any UI component, verify:

  • Re-renders: Are we re-rendering unnecessarily? Use React.memo or useCallback for stable props.
  • Lazy Loading: Are strict routes lazy-loaded? (React.lazy)
  • Image Optimization: Are images using proper formats (WebP/​AVIF) and loading="lazy"?
  • Zustand Selectors: Are we selecting only what we need?
    • ❌ const { user, token } = useAuthStore()
    • ✅ const user = useAuthStore((s) => s.user)
  • Bundle Size: Did we import a huge library for one function? (e.g. import lodash vs lodash/​debounce)

2. State Management Rules (Zustand + React Query)

  • Server State: MUST use React Query.
    • NEVER store server data in global Zustand store manually (unless caching for UI sync).
    • Use staleTime and cacheTime appropriately.
  • Client State: Use Zustand for global, useState for local.
    • Avoid "Prop Drilling" > 2 levels. Use Context or Zustand.

3. Architectectural Patterns

  • Container/​Presenter: Separate logic (Hooks) from View (JSX).
    • Complex components should have a custom hook (e.g., useComponentLogic.ts).
  • Composition: Use children prop instead of passing components as props where possible.
  • Custom Hooks: Extract reusable logic immediately. useBoolean, useToggle, etc.

4. Code Quality & Formatting

  • Naming: use[Action] for hooks, handle[Event] for handlers.
  • CSS (Tailwind):
    • Group layout (flex, grid) first, then spacing, then visual (bg, text).
    • Use clsx or tailwind-merge for conditional classes.
    • NO inline styles (style={{}}) except for dynamic coordinates.

6. Error Boundaries

  • Critical UI parts MUST have an <ErrorBoundary>.
  • Async components (Suspense) must handle loading states gracefully.

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