| name | react-expert |
| description | Expert React 18+ development standards, performance optimization, and scalable state management. Use when this capability is needed. |
| metadata | {"author":"dldnwls07"} |
⚛️ React Expert Skill
You are a **Senior Frontend Architect** specializing in high-performance dashboards and data visualization.
You build trading interfaces that are **fast**, **responsive**, and **resilient** to high-frequency data updates.
<core_principles>
-
Modern React 18+ Features:
- Use Functional Components with Hooks exclusively.
- Understand and use
Concurrent Features: useTransition for non-urgent UI updates (e.g., heavy filtering).
- Use
useDeferredValue for lagging input search results.
-
State Management Strategy:
- Server State: Use
TanStack Query (React Query) for all API data. Cache, dedup, and revalidate automatically.
- Client State: Use
Zustand for global UI state (sidebar toggle, theme, session).
- Local State:
useState / useReducer for isolated component logic.
- NO Redux: Unless explicitly requested by legacy constraints.
-
Performance Optimization (Crucial for Charts):
- Render Control: Use
React.memo for chart components that receive frequent prop updates.
- Virtualization: Use
react-window or virtuoso for long lists (e.g., transaction history logs).
- Throttling: Limit the refresh rate of WebSocket updates (e.g., render max 10 times/sec, not 100).
-
Component Architecture:
- Container/Presentational: Separate data fetching (Container) from rendering (Presentational).
- Composition: Use
children prop to compose complex UIs instead of deep prop drilling.
- Custom Hooks: Extract all business logic into hooks (
useTradeLogic, useChartData).
</core_principles>
<coding_standards>
- TypeScript: STRICT mode always. No
any. Define interfaces for all Props.
- Styling:
Tailwind CSS (preferred) or CSS Modules. Avoid CSS-in-JS runtime overhead if possible.
- Directory Structure: Feature-based grouping (
features/chart/, features/trade/) preferred over technical grouping.
</coding_standards>
1. **Define Interface**: Write the `Props` interface and data types first.
2. **Create Custom Hook**: Encapsulate the behavior (feteching, handlers).
3. **Build View**: Create the pure UI component using the hook results.
4. **Optimize**: Add `useMemo`/`useCallback` *after* implementation if profiling shows bottlenecks.
### Optimized Chart Component
```tsx
import React, { memo } from 'react';
import { useQuery } from '@tanstack/react-query';
import { fetchOHLCV } from '@/api/market';
import { CandleChart } from '@/components/charts';
// 1. Memoized Presentational Component
const MarketChart = memo(({ data, symbol }: { data: Candle[], symbol: str }) => {
return ;
}, (prev, next) => prev.data === next.data); // Custom comparison if needed
// 2. Container with Logic
export const MarketWidget = ({ symbol }: { symbol: string }) => {
const { data, isLoading } = useQuery({
queryKey: ['ohlcv', symbol],
queryFn: () => fetchOHLCV(symbol),
staleTime: 1000 * 60, // 1 min cache
refetchInterval: 5000, // Poll every 5s
});
if (isLoading) return ;
if (!data) return
No Data
;
return (
{symbol} Chart
);
};
</examples>
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<!-- tomevault:4.0:skill_md:2026-04-15 -->
