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[productdevbook]

1. Accessibility (a11y)
   • Keyboard navigation: Support arrow keys, Enter, Space, Escape, and Tab for seamless navigation.
   • ARIA attributes: Properly set aria-expanded, aria-controls, aria-activedescendant, and aria-labelledby.
   • Focus management: Ensure correct focus handling when opening and closing the dropdown.
   • Screen reader support: The selected item and menu state should be clearly conveyed.

2. Headless & Unstyled Design
   • No built-in styles: Allow full customization through user-defined styles.
   • Slot or render prop pattern: Enable flexible UI customization.

3. Strong Type Safety (TypeScript Support)
   • Generic types: Use T extends string | number | symbol for type safety.
   • Well-defined TypeScript interfaces: Ensure proper typings for props and events.

4. Composable Architecture

The component should be modular and split into smaller parts:
• – Wrapper component
• – The button that opens the dropdown
• – The dropdown list container
• – Individual selectable items
• – Label for grouped items
• – Used for grouping items
• – Divider between sections

5. Controlled & Uncontrolled Usage
   • Support v-model (for Vue users).
   • Provide internal state management for uncontrolled usage (useVModel or similar).

6. High Performance
   • Virtual scrolling: Optimize rendering when dealing with large option lists.
   • Debounced filtering: Prevent unnecessary re-renders when searching.

7. Animations & Positioning
   • Use a positioning library: Floating UI or Popper.js for proper menu placement.
   • Support Vue’s Transition API for smooth animations.

8. Asynchronous Data Handling
   • Lazy loading: Fetch options dynamically when needed.
   • Loading state: Display a loading indicator when fetching data.