react-best-practices
React and Next.js performance optimization guidelines from Vercel Engineering. Use when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data fetching, bundle optimization, or performance improvements. Do NOT use for component API architecture or composition patterns (use react-composition-patterns instead).
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/tech-leads-club/agent-skills --skill react-best-practices- 01
Install
Run the command in your project. The CLI asks which agents to install for.
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Describe the task
Ask your agent for something this skill covers. It loads react-best-practices automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Vercel React Best Practices
Comprehensive performance optimization guide for React and Next.js applications, maintained by Vercel. Contains 57 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.
When to Apply
Reference these guidelines when:
- Writing new React components or Next.js pages
- Implementing data fetching (client or server-side)
- Reviewing code for performance issues
- Refactoring existing React/Next.js code
- Optimizing bundle size or load times
Rule Categories by Priority
| Priority | Category | Impact | Prefix |
|---|---|---|---|
| 1 | Eliminating Waterfalls | CRITICAL | async- |
| 2 | Bundle Size Optimization | CRITICAL | bundle- |
| 3 | Server-Side Performance | HIGH | server- |
| 4 | Client-Side Data Fetching | MEDIUM-HIGH | client- |
| 5 | Re-render Optimization | MEDIUM | rerender- |
| 6 | Rendering Performance | MEDIUM | rendering- |
| 7 | JavaScript Performance | LOW-MEDIUM | js- |
| 8 | Advanced Patterns | LOW | advanced- |
Quick Reference
1. Eliminating Waterfalls (CRITICAL)
async-defer-await- Move await into branches where actually usedasync-parallel- Use Promise.all() for independent operationsasync-dependencies- Use better-all for partial dependenciesasync-api-routes- Start promises early, await late in API routesasync-suspense-boundaries- Use Suspense to stream content
2. Bundle Size Optimization (CRITICAL)
bundle-barrel-imports- Import directly, avoid barrel filesbundle-dynamic-imports- Use next/dynamic for heavy componentsbundle-defer-third-party- Load analytics/logging after hydrationbundle-conditional- Load modules only when feature is activatedbundle-preload- Preload on hover/focus for perceived speed
3. Server-Side Performance (HIGH)
server-auth-actions- Authenticate server actions like API routesserver-cache-react- Use React.cache() for per-request deduplicationserver-cache-lru- Use LRU cache for cross-request cachingserver-dedup-props- Avoid duplicate serialization in RSC propsserver-serialization- Minimize data passed to client componentsserver-parallel-fetching- Restructure components to parallelize fetchesserver-after-nonblocking- Use after() for non-blocking operations
4. Client-Side Data Fetching (MEDIUM-HIGH)
client-swr-dedup- Use SWR for automatic request deduplicationclient-event-listeners- Deduplicate global event listenersclient-passive-event-listeners- Use passive listeners for scrollclient-localstorage-schema- Version and minimize localStorage data
5. Re-render Optimization (MEDIUM)
rerender-defer-reads- Don't subscribe to state only used in callbacksrerender-memo- Extract expensive work into memoized componentsrerender-memo-with-default-value- Hoist default non-primitive propsrerender-dependencies- Use primitive dependencies in effectsrerender-derived-state- Subscribe to derived booleans, not raw valuesrerender-derived-state-no-effect- Derive state during render, not effectsrerender-functional-setstate- Use functional setState for stable callbacksrerender-lazy-state-init- Pass function to useState for expensive valuesrerender-simple-expression-in-memo- Avoid memo for simple primitivesrerender-move-effect-to-event- Put interaction logic in event handlersrerender-transitions- Use startTransition for non-urgent updatesrerender-use-ref-transient-values- Use refs for transient frequent values
6. Rendering Performance (MEDIUM)
rendering-animate-svg-wrapper- Animate div wrapper, not SVG elementrendering-content-visibility- Use content-visibility for long listsrendering-hoist-jsx- Extract static JSX outside componentsrendering-svg-precision- Reduce SVG coordinate precisionrendering-hydration-no-flicker- Use inline script for client-only datarendering-hydration-suppress-warning- Suppress expected mismatchesrendering-activity- Use Activity component for show/hiderendering-conditional-render- Use ternary, not && for conditionalsrendering-usetransition-loading- Prefer useTransition for loading state
7. JavaScript Performance (LOW-MEDIUM)
js-batch-dom-css- Group CSS changes via classes or cssTextjs-index-maps- Build Map for repeated lookupsjs-cache-property-access- Cache object properties in loopsjs-cache-function-results- Cache function results in module-level Mapjs-cache-storage- Cache localStorage/sessionStorage readsjs-combine-iterations- Combine multiple filter/map into one loopjs-length-check-first- Check array length before expensive comparisonjs-early-exit- Return early from functionsjs-hoist-regexp- Hoist RegExp creation outside loopsjs-min-max-loop- Use loop for min/max instead of sortjs-set-map-lookups- Use Set/Map for O(1) lookupsjs-tosorted-immutable- Use toSorted() for immutability
8. Advanced Patterns (LOW)
advanced-event-handler-refs- Store event handlers in refsadvanced-init-once- Initialize app once per app loadadvanced-use-latest- useLatest for stable callback refs
How to Use
Read individual rule files for detailed explanations and code examples:
rules/async-parallel.md
rules/bundle-barrel-imports.md
Each rule file contains:
- Brief explanation of why it matters
- Incorrect code example with explanation
- Correct code example with explanation
- Additional context and references
Full Compiled Document
For the complete guide with all rules expanded: AGENTS.md
FAQ
What does the react-best-practices skill do?
React and Next.js performance optimization guidelines from Vercel Engineering. Use when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data fetching, bundle optimization, or performance improvements. Do NOT use for component API architecture or composition patterns (use react-composition-patterns instead).
How do I install react-best-practices?
Run npx skills add https://github.com/tech-leads-club/agent-skills --skill react-best-practices in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/react-best-practices/ (personal) or .claude/skills/react-best-practices/ (project).
Which AI agents can use react-best-practices?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is react-best-practices safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains react-best-practices?
It is published by tech-leads-club in tech-leads-club/agent-skills. It has 236 recorded installs.
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