vercel-react-best-practices

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

12installs121forks

How to install vercel-react-best-practices?

jarrodwatts/claude-code-config/vercel-react-best-practices

$npx -y skills add jarrodwatts/claude-code-config --skill vercel-react-best-practices

Installs into the current project.

Summary

React and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used 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,

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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 45 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-defer-await` - Move await into branches where actually used
32	- `async-parallel` - Use Promise.all() for independent operations
33	- `async-dependencies` - Use better-all for partial dependencies
34	- `async-api-routes` - Start promises early, await late in API routes
35	- `async-suspense-boundaries` - Use Suspense to stream content
36
37	### 2. Bundle Size Optimization (CRITICAL)
38
39	- `bundle-barrel-imports` - Import directly, avoid barrel files
40	- `bundle-dynamic-imports` - Use next/dynamic for heavy components
41	- `bundle-defer-third-party` - Load analytics/logging after hydration
42	- `bundle-conditional` - Load modules only when feature is activated
43	- `bundle-preload` - Preload on hover/focus for perceived speed
44
45	### 3. Server-Side Performance (HIGH)
46
47	- `server-cache-react` - Use React.cache() for per-request deduplication
48	- `server-cache-lru` - Use LRU cache for cross-request caching
49	- `server-serialization` - Minimize data passed to client components
50	- `server-parallel-fetching` - Restructure components to parallelize fetches
51	- `server-after-nonblocking` - Use after() for non-blocking operations
52
53	### 4. Client-Side Data Fetching (MEDIUM-HIGH)
54
55	- `client-swr-dedup` - Use SWR for automatic request deduplication
56	- `client-event-listeners` - Deduplicate global event listeners
57
58	### 5. Re-render Optimization (MEDIUM)
59
60	- `rerender-defer-reads` - Don't subscribe to state only used in callbacks
61	- `rerender-memo` - Extract expensive work into memoized components
62	- `rerender-dependencies` - Use primitive dependencies in effects
63	- `rerender-derived-state` - Subscribe to derived booleans, not raw values
64	- `rerender-functional-setstate` - Use functional setState for stable callbacks
65	- `rerender-lazy-state-init` - Pass function to useState for expensive values
66	- `rerender-transitions` - Use startTransition for non-urgent updates
67
68	### 6. Rendering Performance (MEDIUM)
69
70	- `rendering-animate-svg-wrapper` - Animate div wrapper, not SVG element
71	- `rendering-content-visibility` - Use content-visibility for long lists
72	- `rendering-hoist-jsx` - Extract static JSX outside components
73	- `rendering-svg-precision` - Reduce SVG coordinate precision
74	- `rendering-hydration-no-flicker` - Use inline script for client-only data
75	- `rendering-activity` - Use Activity component for show/hide
76	- `rendering-conditional-render` - Use ternary, not && for conditionals
77
78	### 7. JavaScript Performance (LOW-MEDIUM)
79
80	- `js-batch-dom-css` - Group CSS changes via classes or cssText
81	- `js-index-maps` - Build Map for repeated lookups
82	- `js-cache-property-access` - Cache object properties in loops
83	- `js-cache-function-results` - Cache function results in module-level Map
84	- `js-cache-storage` - Cache localStorage/sessionStorage reads
85	- `js-combine-iterations` - Combine multiple filter/map into one loop
86	- `js-length-check-first` - Check array length before expensive comparison
87	- `js-early-exit` - Return early from functions
88	- `js-hoist-regexp` - Hoist RegExp creation outside loops
89	- `js-min-max-loop` - Use loop for min/max instead of sort
90	- `js-set-map-lookups` - Use Set/Map for O(1) lookups
91	- `js-tosorted-immutable` - Use toSorted() for immutability
92
93	### 8. Advanced Patterns (LOW)
94
95	- `advanced-event-handler-refs` - Store event handlers in refs
96	- `advanced-use-latest` - useLatest for stable callback refs
97
98	## How to Use
99
100	Read individual rule files for detailed explanations and code examples:
101
102	```
103	rules/async-parallel.md
104	rules/bundle-barrel-imports.md
105	rules/_sections.md
106	```
107
108	Each rule fi

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vercel-react-best-practices

12installs121forks

View on GitHub

How to install vercel-react-best-practices?

jarrodwatts/claude-code-config/vercel-react-best-practices

$npx -y skills add jarrodwatts/claude-code-config --skill vercel-react-best-practices

Installs into the current project.

Summary

Files · 1

View on GitHub

SKILL.md

1	# Vercel React Best Practices
2
3	Comprehensive performance optimization guide for React and Next.js applications, maintained by Vercel. Contains 45 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-defer-await` - Move await into branches where actually used
32	- `async-parallel` - Use Promise.all() for independent operations
33	- `async-dependencies` - Use better-all for partial dependencies
34	- `async-api-routes` - Start promises early, await late in API routes
35	- `async-suspense-boundaries` - Use Suspense to stream content
36
37	### 2. Bundle Size Optimization (CRITICAL)
38
39	- `bundle-barrel-imports` - Import directly, avoid barrel files
40	- `bundle-dynamic-imports` - Use next/dynamic for heavy components
41	- `bundle-defer-third-party` - Load analytics/logging after hydration
42	- `bundle-conditional` - Load modules only when feature is activated
43	- `bundle-preload` - Preload on hover/focus for perceived speed
44
45	### 3. Server-Side Performance (HIGH)
46
47	- `server-cache-react` - Use React.cache() for per-request deduplication
48	- `server-cache-lru` - Use LRU cache for cross-request caching
49	- `server-serialization` - Minimize data passed to client components
50	- `server-parallel-fetching` - Restructure components to parallelize fetches
51	- `server-after-nonblocking` - Use after() for non-blocking operations
52
53	### 4. Client-Side Data Fetching (MEDIUM-HIGH)
54
55	- `client-swr-dedup` - Use SWR for automatic request deduplication
56	- `client-event-listeners` - Deduplicate global event listeners
57
58	### 5. Re-render Optimization (MEDIUM)
59
60	- `rerender-defer-reads` - Don't subscribe to state only used in callbacks
61	- `rerender-memo` - Extract expensive work into memoized components
62	- `rerender-dependencies` - Use primitive dependencies in effects
63	- `rerender-derived-state` - Subscribe to derived booleans, not raw values
64	- `rerender-functional-setstate` - Use functional setState for stable callbacks
65	- `rerender-lazy-state-init` - Pass function to useState for expensive values
66	- `rerender-transitions` - Use startTransition for non-urgent updates
67
68	### 6. Rendering Performance (MEDIUM)
69
70	- `rendering-animate-svg-wrapper` - Animate div wrapper, not SVG element
71	- `rendering-content-visibility` - Use content-visibility for long lists
72	- `rendering-hoist-jsx` - Extract static JSX outside components
73	- `rendering-svg-precision` - Reduce SVG coordinate precision
74	- `rendering-hydration-no-flicker` - Use inline script for client-only data
75	- `rendering-activity` - Use Activity component for show/hide
76	- `rendering-conditional-render` - Use ternary, not && for conditionals
77
78	### 7. JavaScript Performance (LOW-MEDIUM)
79
80	- `js-batch-dom-css` - Group CSS changes via classes or cssText
81	- `js-index-maps` - Build Map for repeated lookups
82	- `js-cache-property-access` - Cache object properties in loops
83	- `js-cache-function-results` - Cache function results in module-level Map
84	- `js-cache-storage` - Cache localStorage/sessionStorage reads
85	- `js-combine-iterations` - Combine multiple filter/map into one loop
86	- `js-length-check-first` - Check array length before expensive comparison
87	- `js-early-exit` - Return early from functions
88	- `js-hoist-regexp` - Hoist RegExp creation outside loops
89	- `js-min-max-loop` - Use loop for min/max instead of sort
90	- `js-set-map-lookups` - Use Set/Map for O(1) lookups
91	- `js-tosorted-immutable` - Use toSorted() for immutability
92
93	### 8. Advanced Patterns (LOW)
94
95	- `advanced-event-handler-refs` - Store event handlers in refs
96	- `advanced-use-latest` - useLatest for stable callback refs
97
98	## How to Use
99
100	Read individual rule files for detailed explanations and code examples:
101
102	```
103	rules/async-parallel.md
104	rules/bundle-barrel-imports.md
105	rules/_sections.md
106	```
107
108	Each rule fi

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