Individual skill

react-best-practices

**IMPORTANT**: Any change to React or Next.js code must read through this skill first. React and Next.js guidelines from Vercel Engineering covering visual instability, layout shifts, CLS, flickering, hydration issues, and font loading.

tasks/fix-visual-stability/environment/skills/react-best-practices/SKILL.md

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Last checked: Nov 9, 2026

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Repository stars (not skill ratings): 1,908
Repository last updated: Nov 4, 2026
License: Apache-2.0

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SKILL.mdcore · 5,282 bytes
rules/_sections.mddoc · 1,554 bytes
rules/_template.mddoc · 631 bytes
rules/advanced-event-handler-refs.mddoc · 1,478 bytes
rules/advanced-use-latest.mddoc · 1,191 bytes
rules/async-api-routes.mddoc · 1,125 bytes
rules/async-defer-await.mddoc · 2,008 bytes
rules/async-dependencies.mddoc · 942 bytes
rules/async-parallel.mddoc · 654 bytes
rules/async-suspense-boundaries.mddoc · 2,506 bytes
rules/bundle-barrel-imports.mddoc · 2,370 bytes
rules/bundle-conditional.mddoc · 937 bytes
rules/bundle-defer-third-party.mddoc · 920 bytes
rules/bundle-dynamic-imports.mddoc · 791 bytes
rules/bundle-preload.mddoc · 1,149 bytes
rules/client-event-listeners.mddoc · 1,968 bytes
rules/client-localstorage-schema.mddoc · 1,950 bytes
rules/client-passive-event-listeners.mddoc · 1,636 bytes
rules/client-swr-dedup.mddoc · 1,159 bytes
rules/js-batch-dom-css.mddoc · 1,898 bytes
rules/js-cache-function-results.mddoc · 1,931 bytes
rules/js-cache-property-access.mddoc · 532 bytes
rules/js-cache-storage.mddoc · 1,651 bytes
rules/js-combine-iterations.mddoc · 753 bytes
rules/js-early-exit.mddoc · 1,129 bytes
rules/js-hoist-regexp.mddoc · 1,028 bytes
rules/js-index-maps.mddoc · 837 bytes
rules/js-length-check-first.mddoc · 1,752 bytes
rules/js-min-max-loop.mddoc · 2,093 bytes
rules/js-set-map-lookups.mddoc · 532 bytes
rules/js-tosorted-immutable.mddoc · 1,782 bytes
rules/rendering-activity.mddoc · 564 bytes
rules/rendering-animate-svg-wrapper.mddoc · 1,179 bytes
rules/rendering-conditional-render.mddoc · 980 bytes
rules/rendering-content-visibility.mddoc · 815 bytes
rules/rendering-hoist-jsx.mddoc · 1,039 bytes
rules/rendering-hydration-no-flicker.mddoc · 2,302 bytes
rules/rendering-svg-precision.mddoc · 588 bytes
rules/rerender-defer-reads.mddoc · 973 bytes
rules/rerender-dependencies.mddoc · 824 bytes
rules/rerender-derived-state.mddoc · 724 bytes
rules/rerender-functional-setstate.mddoc · 2,956 bytes
rules/rerender-lazy-state-init.mddoc · 2,008 bytes
rules/rerender-memo.mddoc · 1,148 bytes
rules/rerender-transitions.mddoc · 1,055 bytes
rules/server-after-nonblocking.mddoc · 2,000 bytes
rules/server-cache-lru.mddoc · 1,353 bytes
rules/server-cache-react.mddoc · 2,228 bytes
rules/server-parallel-fetching.mddoc · 1,554 bytes
rules/server-serialization.mddoc · 996 bytes

Read excerpt


# Vercel React Best Practices

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.

## When to Apply

Reference these guidelines when:

- Refactoring existing React/Next.js code
- Writing new React components or Next.js pages
- Fixing visual instability or layout shift (CLS) issues
- Preventing flickering when reading from localStorage or cookies
- Handling hydration mismatches with client-only data
- Optimizing font loading (FOIT/FOUT prevention)