# React Best Practices

> React best-practices reviewer for TSX files. Triggers after editing multiple TSX components to run a condensed quality checklist covering component structure, hooks usage, accessibility, performance, and TypeScript patterns.

Fuente: https://skillsagentes.com/skills/vercel/vercel-plugin/react-best-practices
Markdown: https://skillsagentes.com/skills/vercel/vercel-plugin/react-best-practices.md

Repositorio: https://github.com/vercel/vercel-plugin
Autor: vercel
Licencia: NOASSERTION
Actualizado: hace 5 meses
Coste de contexto: 56 tok instalada, 2k tok al activarse, 50.9k tok con todos los archivos del bundle
Bundle: 69 archivos, 199 KB
Permisos que pide: ninguno declarado

## Instalación

Un skill son archivos markdown: los mismos archivos valen para cualquier agente y lo único que cambia es el directorio de destino, es decir la bandera `--agent`. Añade `-g` para instalarlo en todos los proyectos de la máquina.

```bash
# Claude Code
npx -y skills add vercel/vercel-plugin --skill react-best-practices --agent claude-code
# Cursor
npx -y skills add vercel/vercel-plugin --skill react-best-practices --agent cursor
# Codex
npx -y skills add vercel/vercel-plugin --skill react-best-practices --agent codex
# Gemini CLI
npx -y skills add vercel/vercel-plugin --skill react-best-practices --agent gemini
# Windsurf
npx -y skills add vercel/vercel-plugin --skill react-best-practices --agent windsurf
# Cline
npx -y skills add vercel/vercel-plugin --skill react-best-practices --agent cline
```

## Archivos

- AGENTS.md — 92 KB
- SKILL.md — 8 KB
- overlay.yaml — 2 KB
- rules/_sections.md — 2 KB
- rules/_template.md — 631 B
- rules/advanced-event-handler-refs.md — 1 KB
- rules/advanced-init-once.md — 958 B
- rules/advanced-use-latest.md — 1 KB
- rules/async-api-routes.md — 1 KB
- rules/async-defer-await.md — 2 KB
- rules/async-dependencies.md — 1 KB
- rules/async-parallel.md — 654 B
- rules/async-suspense-boundaries.md — 2 KB
- rules/bundle-barrel-imports.md — 2 KB
- rules/bundle-conditional.md — 949 B
- rules/bundle-defer-third-party.md — 920 B
- rules/bundle-dynamic-imports.md — 791 B
- rules/bundle-preload.md — 1 KB
- rules/client-event-listeners.md — 2 KB
- rules/client-localstorage-schema.md — 2 KB
- rules/client-passive-event-listeners.md — 2 KB
- rules/client-swr-dedup.md — 1 KB
- rules/js-batch-dom-css.md — 3 KB
- rules/js-cache-function-results.md — 2 KB
- rules/js-cache-property-access.md — 532 B
- rules/js-cache-storage.md — 2 KB
- rules/js-combine-iterations.md — 753 B
- rules/js-early-exit.md — 1 KB
- rules/js-flatmap-filter.md — 1 KB
- rules/js-hoist-regexp.md — 1 KB
- rules/js-index-maps.md — 837 B
- rules/js-length-check-first.md — 2 KB
- rules/js-min-max-loop.md — 2 KB
- rules/js-set-map-lookups.md — 532 B
- rules/js-tosorted-immutable.md — 2 KB
- rules/rendering-activity.md — 564 B
- rules/rendering-animate-svg-wrapper.md — 1 KB
- rules/rendering-conditional-render.md — 980 B
- rules/rendering-content-visibility.md — 815 B
- rules/rendering-hoist-jsx.md — 1 KB
- rules/rendering-hydration-no-flicker.md — 2 KB
- rules/rendering-hydration-suppress-warning.md — 872 B
- rules/rendering-resource-hints.md — 2 KB
- rules/rendering-script-defer-async.md — 2 KB
- rules/rendering-svg-precision.md — 588 B
- rules/rendering-usetransition-loading.md — 2 KB
- rules/rerender-defer-reads.md — 973 B
- rules/rerender-dependencies.md — 824 B
- rules/rerender-derived-state-no-effect.md — 1 KB
- rules/rerender-derived-state.md — 728 B
- rules/rerender-functional-setstate.md — 3 KB
- rules/rerender-lazy-state-init.md — 2 KB
- rules/rerender-memo-with-default-value.md — 1 KB
- rules/rerender-memo.md — 1 KB
- rules/rerender-move-effect-to-event.md — 1 KB
- rules/rerender-no-inline-components.md — 2 KB
- rules/rerender-simple-expression-in-memo.md — 1018 B
- rules/rerender-split-combined-hooks.md — 2 KB
- rules/rerender-transitions.md — 1 KB
- rules/rerender-use-deferred-value.md — 2 KB
- rules/rerender-use-ref-transient-values.md — 2 KB
- rules/server-after-nonblocking.md — 2 KB
- rules/server-auth-actions.md — 3 KB
- rules/server-cache-lru.md — 1 KB
- rules/server-cache-react.md — 2 KB
- rules/server-dedup-props.md — 2 KB
- rules/server-hoist-static-io.md — 4 KB
- rules/server-parallel-fetching.md — 2 KB
- rules/server-serialization.md — 996 B

## SKILL.md

Reproducido tal cual desde vercel/vercel-plugin bajo NOASSERTION. Esta sección es el documento original y está en inglés.

# Vercel React Best Practices

Comprehensive performance optimization guide for React and Next.js applications, maintained by Vercel. Contains 64 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 used
- `async-parallel` - Use Promise.all() for independent operations
- `async-dependencies` - Use better-all for partial dependencies
- `async-api-routes` - Start promises early, await late in API routes
- `async-suspense-boundaries` - Use Suspense to stream content

### 2. Bundle Size Optimization (CRITICAL)

- `bundle-barrel-imports` - Import directly, avoid barrel files
- `bundle-dynamic-imports` - Use next/dynamic for heavy components
- `bundle-defer-third-party` - Load analytics/logging after hydration
- `bundle-conditional` - Load modules only when feature is activated
- `bundle-preload` - Preload on hover/focus for perceived speed

### 3. Server-Side Performance (HIGH)

- `server-auth-actions` - Authenticate server actions like API routes
- `server-cache-react` - Use React.cache() for per-request deduplication
- `server-cache-lru` - Use LRU cache for cross-request caching
- `server-dedup-props` - Avoid duplicate serialization in RSC props
- `server-hoist-static-io` - Hoist static I/O (fonts, logos) to module level
- `server-serialization` - Minimize data passed to client components
- `server-parallel-fetching` - Restructure components to parallelize fetches
- `server-after-nonblocking` - Use after() for non-blocking operations

### 4. Client-Side Data Fetching (MEDIUM-HIGH)

- `client-swr-dedup` - Use SWR for automatic request deduplication
- `client-event-listeners` - Deduplicate global event listeners
- `client-passive-event-listeners` - Use passive listeners for scroll
- `client-localstorage-schema` - Version and minimize localStorage data

### 5. Re-render Optimization (MEDIUM)

- `rerender-defer-reads` - Don't subscribe to state only used in callbacks
- `rerender-memo` - Extract expensive work into memoized components
- `rerender-memo-with-default-value` - Hoist default non-primitive props
- `rerender-dependencies` - Use primitive dependencies in effects
- `rerender-derived-state` - Subscribe to derived booleans, not raw values
- `rerender-derived-state-no-effect` - Derive state during render, not effects
- `rerender-functional-setstate` - Use functional setState for stable callbacks
- `rerender-lazy-state-init` - Pass function to useState for expensive values
- `rerender-simple-expression-in-memo` - Avoid memo for simple primitives
- `rerender-split-combined-hooks` - Split hooks with independent dependencies
- `rerender-move-effect-to-event` - Put interaction logic in event handlers
- `rerender-transitions` - Use startTransition for non-urgent updates
- `rerender-use-deferred-value` - Defer expensive renders to keep input responsive
- `rerender-use-ref-transient-values` - Use refs for transient frequent values
- `rerender-no-inline-components` - Don't define components inside components

### 6. Rendering Performance (MEDIUM)

- `rendering-animate-svg-wrapper` - Animate div wrapper, not SVG element
- `rendering-content-visibility` - Use content-visibility for long lists
- `rendering-hoist-jsx` - Extract static JSX outside components
- `rendering-svg-precision` - Reduce SVG coordinate precision
- `rendering-hydration-no-flicker` - Use inline script for client-only data
- `rendering-hydration-suppress-warning` - Suppress expected mismatches
- `rendering-activity` - Use Activity component for show/hide
- `rendering-conditional-render` - Use ternary, not && for conditionals
- `rendering-usetransition-loading` - Prefer useTransition for loading state
- `rendering-resource-hints` - Use React DOM resource hints for preloading
- `rendering-script-defer-async` - Use defer or async on script tags

### 7. JavaScript Performance (LOW-MEDIUM)

- `js-batch-dom-css` - Group CSS changes via classes or cssText
- `js-index-maps` - Build Map for repeated lookups
- `js-cache-property-access` - Cache object properties in loops
- `js-cache-function-results` - Cache function results in module-level Map
- `js-cache-storage` - Cache localStorage/sessionStorage reads
- `js-combine-iterations` - Combine multiple filter/map into one loop
- `js-length-check-first` - Check array length before expensive comparison
- `js-early-exit` - Return early from functions
- `js-hoist-regexp` - Hoist RegExp creation outside loops
- `js-min-max-loop` - Use loop for min/max instead of sort
- `js-set-map-lookups` - Use Set/Map for O(1) lookups
- `js-tosorted-immutable` - Use toSorted() for immutability
- `js-flatmap-filter` - Use flatMap to map and filter in one pass

### 8. Advanced Patterns (LOW)

- `advanced-event-handler-refs` - Store event handlers in refs
- `advanced-init-once` - Initialize app once per app load
- `advanced-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`

## Dónde encaja

- Categoría: [Herramientas para desarrolladores](https://skillsagentes.com/categorias/herramientas-desarrollo.md) — Skills que cambian cómo tu agente escribe, revisa y despliega código.
- Creador: [vercel](https://skillsagentes.com/creators/vercel.md) — 79 skills en el directorio
- [Todas las skills](https://skillsagentes.com/skills.md)
- [Ranking de instalaciones](https://skillsagentes.com/ranking.md)

## Otras skills del mismo repositorio

- [Knowledge Update](https://skillsagentes.com/skills/vercel/vercel-plugin/knowledge-update.md): Corrects outdated LLM knowledge about the Vercel platform and introduces new products. Injected at session start.
- [Vercel Connect](https://skillsagentes.com/skills/vercel/vercel-plugin/vercel-connect.md): Vercel Connect expert guidance — securely obtain scoped OAuth tokens for third-party services (Slack, GitHub, MCP servers, OAuth, Snowflake) on behalf of apps or users via Vercel OIDC. Use when wiring up third-party API access, connecting to MCP servers, sending Slack messages, accessing GitHub APIs, receiving webhook events from Slack/Linear/GitHub and forwarding them to your agents and apps, or building eve agent connections.
- [Vercel Functions](https://skillsagentes.com/skills/vercel/vercel-plugin/vercel-functions.md): Vercel Functions expert guidance — Serverless Functions, Edge Functions, Fluid Compute, streaming, Cron Jobs, and runtime configuration. Use when configuring, debugging, or optimizing server-side code running on Vercel.
- [Cdn Caching](https://skillsagentes.com/skills/vercel/vercel-plugin/cdn-caching.md): Debug Vercel CDN caching — cache hit rate, stale content, revalidation behavior, ISR + PPR, per-request cache reasons (cacheReason) and PPR state (ppr_state), and costs.
- [Eve](https://skillsagentes.com/skills/vercel/vercel-plugin/eve.md): eve framework guidance for durable AI agents and agent-powered applications. Use when creating, editing, or debugging an eve project, when the user explicitly asks for eve, or when the build-agents skill has selected eve as the default framework. Covers eve's filesystem-first runtime, durable sessions, tools, skills, connections, channels, sandboxes, subagents, schedules, evals, frontend clients, and Agent Runs observability. Do not use for incidental agent mentions, generic agent-building prompts, or established non-eve stacks unless the user asks for comparison or migration.

## Skills relacionadas

- [Benchmark Sandbox](https://skillsagentes.com/skills/vercel/vercel-plugin/benchmark-sandbox.md): Run vercel-plugin eval scenarios in Vercel Sandboxes instead of local WezTerm panels. Provisions ephemeral microVMs with Claude Code + plugin pre-installed, runs benchmark prompts, extracts hook artifacts, and produces coverage reports.
- [Release](https://skillsagentes.com/skills/vercel/vercel-plugin/release.md): Release vercel-plugin — run gates, bump version, generate artifacts, commit, and push. Use when asked to "release", "ship", "bump and push", or "cut a release".
- [Access Protected Vercel Deployment](https://skillsagentes.com/skills/vercel/vercel-plugin/access-protected-vercel-deployment.md): Access and test Vercel deployments protected by Vercel Authentication, SSO, or Deployment Protection. Use when curl, agent-browser, Playwright, or another automated request reaches a Vercel login or protection page; when a protected preview or production URL returns 401 or 403; when TRUSTED_SOURCES_ENVIRONMENT_MISMATCH appears; or when choosing between `vercel curl` and the `x-vercel-trusted-oidc-idp-token` header.
- [Ai Gateway](https://skillsagentes.com/skills/vercel/vercel-plugin/ai-gateway.md): Vercel AI Gateway expert guidance. Use when configuring model routing, provider failover, cost tracking, or managing multiple AI providers through a unified API.
- [Ai Sdk](https://skillsagentes.com/skills/vercel/vercel-plugin/ai-sdk.md): Vercel AI SDK expert guidance. Use when building AI-powered features — chat interfaces, text generation, structured output, tool calling, agents, MCP integration, streaming, embeddings, reranking, image generation, or working with any LLM provider.

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