react-best-practices

Name: react-best-practices
Author: vercel-labs

byvercel-labs· 154 skills

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vercel-labs/agent-skills/react-best-practices

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SKILL.md

1	# Vercel React Best Practices
2
3	Comprehensive performance optimization guide for React and Next.js applications, maintained by Vercel. Contains 70 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.
4
5	## When to Apply
6
7	Reference these guidelines when:
8	- Writing new React components or Next.js pages
9	- Implementing data fetching (client or server-side)
10	- Reviewing code for performance issues
11	- Refactoring existing React/Next.js code
12	- Optimizing bundle size or load times
13
14	## Rule Categories by Priority
15
16	\| Priority \| Category \| Impact \| Prefix \|
17	\|----------\|----------\|--------\|--------\|
18	\| 1 \| Eliminating Waterfalls \| CRITICAL \| `async-` \|
19	\| 2 \| Bundle Size Optimization \| CRITICAL \| `bundle-` \|
20	\| 3 \| Server-Side Performance \| HIGH \| `server-` \|
21	\| 4 \| Client-Side Data Fetching \| MEDIUM-HIGH \| `client-` \|
22	\| 5 \| Re-render Optimization \| MEDIUM \| `rerender-` \|
23	\| 6 \| Rendering Performance \| MEDIUM \| `rendering-` \|
24	\| 7 \| JavaScript Performance \| LOW-MEDIUM \| `js-` \|
25	\| 8 \| Advanced Patterns \| LOW \| `advanced-` \|
26
27	## Quick Reference
28
29	### 1. Eliminating Waterfalls (CRITICAL)
30
31	- `async-cheap-condition-before-await` - Check cheap sync conditions before awaiting flags or remote values
32	- `async-defer-await` - Move await into branches where actually used
33	- `async-parallel` - Use Promise.all() for independent operations
34	- `async-dependencies` - Use better-all for partial dependencies
35	- `async-api-routes` - Start promises early, await late in API routes
36	- `async-suspense-boundaries` - Use Suspense to stream content
37
38	### 2. Bundle Size Optimization (CRITICAL)
39
40	- `bundle-barrel-imports` - Import directly, avoid barrel files
41	- `bundle-analyzable-paths` - Prefer statically analyzable import and file-system paths to avoid broad bundles and traces
42	- `bundle-dynamic-imports` - Use next/dynamic for heavy components
43	- `bundle-defer-third-party` - Load analytics/logging after hydration
44	- `bundle-conditional` - Load modules only when feature is activated
45	- `bundle-preload` - Preload on hover/focus for perceived speed
46
47	### 3. Server-Side Performance (HIGH)
48
49	- `server-auth-actions` - Authenticate server actions like API routes
50	- `server-cache-react` - Use React.cache() for per-request deduplication
51	- `server-cache-lru` - Use LRU cache for cross-request caching
52	- `server-dedup-props` - Avoid duplicate serialization in RSC props
53	- `server-hoist-static-io` - Hoist static I/O (fonts, logos) to module level
54	- `server-no-shared-module-state` - Avoid module-level mutable request state in RSC/SSR
55	- `server-serialization` - Minimize data passed to client components
56	- `server-parallel-fetching` - Restructure components to parallelize fetches
57	- `server-parallel-nested-fetching` - Chain nested fetches per item in Promise.all
58	- `server-after-nonblocking` - Use after() for non-blocking operations
59
60	### 4. Client-Side Data Fetching (MEDIUM-HIGH)
61
62	- `client-swr-dedup` - Use SWR for automatic request deduplication
63	- `client-event-listeners` - Deduplicate global event listeners
64	- `client-passive-event-listeners` - Use passive listeners for scroll
65	- `client-localstorage-schema` - Version and minimize localStorage data
66
67	### 5. Re-render Optimization (MEDIUM)
68
69	- `rerender-defer-reads` - Don't subscribe to state only used in callbacks
70	- `rerender-memo` - Extract expensive work into memoized components
71	- `rerender-memo-with-default-value` - Hoist default non-primitive props
72	- `rerender-dependencies` - Use primitive dependencies in effects
73	- `rerender-derived-state` - Subscribe to derived booleans, not raw values
74	- `rerender-derived-state-no-effect` - Derive state during render, not effects
75	- `rerender-functional-setstate` - Use functional setState for stable callbacks
76	- `rerender-lazy-state-init` - Pass function to useState for expensive values
77	- `rerender-simple-expression-in-memo` - Avoid memo for simple primitives
78	- `rerender-split-combined-hooks` - Split hooks with independent dependencies
79	- `rerender-move-effect-to-event` - Put interaction logic in event handlers
80	- `rerender-transitions` - Use startTransition for non-urgent updates
81	- `rerender-use-deferred-value` - Defer expensive renders to keep input responsive
82	- `rerender-use-ref-transient-values` - Use refs for transient frequent values
83	- `rerender-no-inline-components` - Don't define components inside components
84
85	### 6. Rendering Performance (MEDIUM)
86
87	- `rendering-animate-svg-wrapper` - Animate div wrapper, not SVG element
88	- `rendering-content-visibility` - Use content-visibility for long lists
89	- `rendering-hoist-jsx` - Extract static JSX outside components
90	- `rendering-svg-precision` - Reduce SVG coordinate precision
91	- `rendering-hydration-no-flicker` - Use inline script for client-only data
92	- `rendering-hydration-suppress-warning` - Suppress expected mismatches
93	- `rendering-activity` - Use Activity component for show/hide
94	- `rendering-conditional-render` - Use ternary, not && for conditionals
95	- `rendering-usetransition-loading` - Prefer useTransition for loading state
96	- `rendering-resource-hints` - Use React DOM resource hints for preloading
97	- `rendering-script-defer-async` - Use defer or async on script tags
98
99	### 7. JavaScript Performance (LOW-MEDIUM)
100
101	- `js-batch-dom-css` - Group CSS changes via classes or cssText
102	- `js-index-maps` - Build Map for repeated lookups
103	- `js-cache-property-access` - Cache object properties in loops
104	- `js-cache-function-results` - Cache function results in module-level Map
105	- `js-cache-storage` - Cache localStorage/sessionStorage reads
106	- `js-combine-iterations` - Combine multiple filter/map into one loop
107	- `js-length-check-first` - Check array length before expensive comparison
108	- `js-early-exit` - Return early from functions
109	- `js-hoist-regexp` - Hoist RegExp creation outside loops
110	- `js-min-max-loop` - Use loop for min/max instead of sort
111	- `js-set-map-lookups` - Use Set/Map for O(1) lookups
112	- `js-tosorted-immutable` - Use toSorted() for immutability
113	- `js-flatmap-filter` - Use flatMap to map and filter in one pass
114	- `js-request-idle-callback` - Defer non-critical work to browser idle time
115
116	### 8. Advanced Patterns (LOW)
117
118	- `advanced-effect-event-deps` - Don't put `useEffectEvent` results in effect deps
119	- `advanced-event-handler-refs` - Store event handlers in refs
120	- `advanced-init-once` - Initialize app once per app load
121	- `advanced-use-latest` - useLatest for stable callback refs
122
123	## How to Use
124
125	Read individual rule files for detailed explanations and code examples:
126
127	```
128	rules/async-parallel.md
129	rules/bundle-barrel-imports.md
130	```
131
132	Each rule file contains:
133	- Brief explanation of why it matters
134	- Incorrect code example with explanation
135	- Correct code example with explanation
136	- Additional context and references
137
138	## Full Compiled Document
139
140	For the complete guide with all rules expanded: `AGENTS.md`

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Run `npx skills use "https://github.com/vercel-labs/agent-skills" --skill "vercel-labs/agent-skills/react-best-practices"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.

Use the skills in "https://github.com/vercel-labs/agent-skills" that are relevant to the current task. Run `npx skills add "https://github.com/vercel-labs/agent-skills"` and select the relevant skills, then follow their instructions.

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