Skill: Create UI Component

Trigger

When the user asks to create a new UI component.

Prerequisites

• Project uses React (or Vue; adjust steps)
• src/components/ or equivalent exists
• Testing framework configured (Jest, Vitest, etc.)
• Styling approach known (Tailwind, CSS Modules, etc.)

Steps

Step 1: Define Component

• Name the component (PascalCase)
• Define its purpose and responsibilities
• Identify parent and child components
• List props and their types
• Identify state requirements

Step 2: Create Component Directory

src/components/{category}/{ComponentName}/
├── {ComponentName}.tsx       # Component implementation
├── {ComponentName}.test.tsx  # Unit tests
├── {ComponentName}.stories.tsx # Storybook story (optional)
└── index.ts                  # Public export

Step 3: Define Props Interface

• Create TypeScript interface for props
• Add JSDoc documentation for complex props
• Set default values where appropriate
• Mark optional props with ?

Step 4: Implement Component

• Use functional component with hooks
• Destructure props in function signature
• Implement rendering logic
• Add error boundary if needed
• Handle loading, error, and empty states

Step 5: Add Accessibility

• Semantic HTML elements used
• ARIA attributes where needed
• Keyboard navigation works
• Focus management for modals/popups
• Color contrast meets WCAG 2.1 AA

Step 6: Add Styling

• Follow project styling approach
• Responsive across breakpoints
• Dark mode support
• Design token usage (no magic numbers)
• No inline styles (except dynamic values)

Step 7: Write Tests

• Renders correctly with default props
• Renders correctly with all prop combinations
• User interactions work (click, type, etc.)
• Accessibility tests pass
• Error states handled

Step 8: Create Export

• Export component from index.ts
• Export props interface

Completion Checklist

• Component renders with default props
• Props interface exported
• Tests pass
• Accessibility: keyboard nav, ARIA, contrast
• No lint/type errors

If Step Fails

• Step 2 (directory): Match existing structure in src/components/ (ui/, features/, layout/)
• Step 5 (a11y): Use aria-label on icon buttons; role only when semantic HTML insufficient
• Step 7 (tests): Run single file: npm test -- ComponentName.test.tsx. Fix type errors first with {{CONFIG.testing.typeCheckCommand}}

Example

Step 1: OrderSummary — displays order total and item count. Props: items, taxRate. Step 4: Functional component, useMemo for total calculation, loading/empty states.