ReddRadar
Agent skill
pitfalls-react
React component patterns, forms, accessibility, and responsive design. Use when building React components, handling forms, or ensuring accessibility. Triggers on: React component, useEffect, form validation, a11y, responsive, Error Boundary.
Install this agent skill to your Project
npx add-skill https://github.com/aiskillstore/marketplace/tree/main/skills/barissozen/pitfalls-react
SKILL.md
React Pitfalls
Common pitfalls and correct patterns for React development.
When to Use
- Building React components
- Implementing form validation
- Adding error boundaries
- Ensuring accessibility (a11y)
- Creating responsive layouts
- Reviewing React code
Workflow
Step 1: Check Component Patterns
Verify loading/error states and data checks.
Step 2: Verify Form Validation
Ensure Zod schemas and proper error display.
Step 3: Check Accessibility
Verify ARIA labels and keyboard navigation.
Component Patterns
// ✅ Define helpers before use or as exports
function formatPrice(price: number) { ... }
export default function Component() {
// ✅ Check data exists before accessing
if (!data) return <Loading />;
// ✅ useEffect for side effects only
useEffect(() => {
fetchData();
}, []);
// ✅ data-testid on interactive elements
return <button data-testid="submit-btn">Submit</button>;
}
// ❌ WRONG: Defining function in render
return <button onClick={() => {
function doSomething() { } // Don't define here
doSomething();
}}>
// ✅ Navigation with router, not window
import { Link, useLocation } from 'wouter';
<Link to="/dashboard">Go</Link>
// ❌ window.location.href = '/dashboard'
Error Boundary
// ✅ Wrap major components in error boundaries
class ErrorBoundary extends React.Component {
state = { hasError: false, error: null };
static getDerivedStateFromError(error) {
return { hasError: true, error };
}
componentDidCatch(error, info) {
logError({ error, componentStack: info.componentStack });
}
render() {
if (this.state.hasError) {
return <ErrorFallback onRetry={() => this.setState({ hasError: false })} />;
}
return this.props.children;
}
}
// ✅ Graceful degradation
function Dashboard() {
const { data, error, isLoading } = useQuery(...);
if (isLoading) return <Skeleton />;
if (error) return <ErrorCard message="Unable to load" onRetry={refetch} />;
if (!data) return <EmptyState />;
return <DashboardContent data={data} />;
}
Form Validation
// ✅ Zod schemas for all forms
const createStrategySchema = z.object({
name: z.string().min(1, 'Name required').max(100),
type: z.enum(['cross-exchange', 'triangular']),
minProfit: z.number().positive('Must be positive'),
});
// ✅ React Hook Form with Zod
const form = useForm<z.infer<typeof createStrategySchema>>({
resolver: zodResolver(createStrategySchema),
});
// ✅ Show errors inline
{errors.name && <span className="text-red-500">{errors.name.message}</span>}
// ✅ Disable submit while validating/submitting
<button disabled={isSubmitting || !isValid}>Submit</button>
Responsive Layout
/* ✅ Mobile-first breakpoints */
.container { padding: 1rem; }
@media (min-width: 768px) {
.container { padding: 2rem; }
}
/* ✅ Touch-friendly button sizes (min 44px) */
.btn { min-height: 44px; min-width: 44px; }
/* ✅ Horizontal scroll for data tables on mobile */
.table-container { overflow-x: auto; }
Accessibility (a11y)
// ✅ Semantic HTML
<nav>...</nav>
<main>...</main>
<button>Click me</button> // Not <div onClick>
// ✅ ARIA labels
<button aria-label="Close dialog">×</button>
// ✅ Keyboard navigation
<button onKeyDown={(e) => e.key === 'Enter' && handleClick()}>
// ✅ Focus indicators
button:focus { outline: 2px solid blue; outline-offset: 2px; }
Quick Checklist
- Loading/error states handled
- data-testid on interactive elements
- Using router Link, not window.location
- Helper functions defined before use
- Error boundaries on major components
- Touch targets ≥ 44px
- ARIA labels on icon buttons
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