react-best-practices

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Client-side React performance optimization patterns.

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React Best Practices

Client-side React optimization patterns for Cloud UI. 29 rules organized by category and impact.

Activation Conditions

Performance optimization tasks
Component re-render issues
Bundle size concerns
useEffect/useMemo patterns

Rules by Category

Bundle Optimization (CRITICAL)

Rule	Key Point
`bundle-barrel-imports`	Import from source files, not barrel `index.ts`
`bundle-code-splitting`	`React.lazy` + `Suspense` for heavy components, conditional loads, deferred 3rd-party
`bundle-preload`	Preload critical resources

Re-render Prevention (HIGH)

Rule	Key Point
`rerender-memo`	Memoize expensive computations
`rerender-dependencies`	Minimize hook dependency arrays
`rerender-derived-state`	Compute during render, not in effects
`rerender-functional-setstate`	`setState(prev => ...)` to avoid stale closures
`rerender-lazy-state-init`	`useState(() => expensive())` not `useState(expensive())`
`rerender-simple-expression-in-memo`	Don't memoize trivial expressions
`rerender-transitions`	`useTransition` for non-urgent updates
`rerender-defer-reads`	Read URL params / storage inside callbacks, not at render

Rendering (MEDIUM)

Rule	Key Point
`rendering-conditional-render`	Short-circuit with `&&` / ternary, avoid render in effects
`rendering-hoist-jsx`	Move static JSX outside components
`rendering-content-visibility`	CSS `content-visibility: auto` for off-screen
`rendering-activity`	React `<Activity>` for hidden UI
`rendering-animate-svg-wrapper`	Wrap animated SVGs to isolate re-renders
`rendering-svg-precision`	Limit SVG coordinate precision

Async (MEDIUM)

Rule	Key Point
`async-suspense-boundaries`	Granular `<Suspense>` boundaries
`async-defer-await`	Don't await non-blocking work
`async-dependencies`	Load deps in parallel, not sequentially

JavaScript (MEDIUM)

Rule	Key Point
`js-caching-patterns`	Module-level Map caches for repeated calls + storage reads
`js-batch-dom-css`	Batch DOM reads/writes to avoid layout thrashing
`js-index-maps`	Pre-index arrays into Maps for O(1) lookups
`js-length-check-first`	Check `.length` before expensive operations
`js-tosorted-immutable`	Use `.toSorted()` / `.toReversed()` for immutable transforms

RegExp hoisting is enforced by Biome (useTopLevelRegex).

Browser (MEDIUM)

Rule	Key Point
`client-event-listeners`	Clean up event listeners in useEffect return
`client-passive-event-listeners`	`{ passive: true }` for scroll/touch handlers

Advanced (LOW)

Rule	Key Point
`advanced-event-handler-refs`	Stable callback refs to avoid child re-renders
`advanced-use-latest`	`useLatest` pattern for always-current values in callbacks

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