Agent Skills: Qwik Expert

Qwik Expert

qwik and tailwind best practices

When reviewing or writing code, apply these guidelines:

• Use $ suffix for lazy-loaded functions
• Utilize useSignal() for reactive state
• Implement Tailwind CSS classes for styling
• Use @apply directive in CSS files for reusable styles
• Implement responsive design using Tailwind's responsive classes
• Utilize Tailwind's configuration file for customization
• Leverage TypeScript for type safety
• Use Vite's fast HMR for development

qwik city routing

When reviewing or writing code, apply these guidelines:

• Utilize Qwik City for routing when applicable

qwik folder structure

When reviewing or writing code, apply these guidelines:

• Recommended folder structure:

  src/ components/ routes/ global.css root.tsx entry.ssr.tsx public/ tailwind.config.js postcss.config.js vite.config.ts tsconfig.json

qwik functional components preference

When reviewing or writing code, apply these guidelines:

• Always prefer functional components in Qwik files.

qwik js best practices

When reviewing or writing code, apply these guidelines:

• Use $ suffix for lazy-loaded functions
• Utilize useSignal() for reactive state
• Implement useStore() for complex state objects
• Use useResource$() for data fetching
• Implement useTask$() for side effects
• Utilize useVisibleTask$() for browser-only code

qwik js error handling optimization

When reviewing or writing code, apply these guidelines:

• Implement proper error boundaries
• Utilize Qwik City for routing when applicable
• Use Qwik's built-in optimization features
• Implement lazy-loading for improved performance

qwik js folder structure

When reviewing or writing code, apply these guidelines:

• Use the following folder structure:

  src/ components/ routes/ global.css root.tsx entry.ssr.tsx public/ vite.config.ts tsconfig.json

qwik js general preferences

When reviewing or writing code, apply these guidelines:

• Always prefer functional components in Qwik files
• Use TypeScript for type safety
• Leverage Qwik's resumability model for optimal performance
• Minimize client-side JavaScript via lazy loading </instructions>

Consolidated Skills

This expert skill consolidates 1 individual skills:

• qwik-expert

Iron Laws

1. ALWAYS use the $ suffix for event handlers and lazy-loaded functions — without it, Qwik cannot extract them for resumability and forces full hydration.
2. NEVER access browser APIs (window, document, localStorage) in component body code — use useVisibleTask$() to scope browser-only code and prevent SSR errors.
3. ALWAYS use useSignal() for reactive primitive state and useStore() for complex objects — plain variables are not reactive and will not trigger re-renders.
4. NEVER import large client-side libraries at the top level — use dynamic import() or lazy-load via $ to preserve Qwik's zero-JS-on-load advantage.
5. ALWAYS prefer functional components — Qwik's resumability model is designed exclusively for functional component paradigms; class components have no first-class support.

Anti-Patterns

| Anti-Pattern | Why It Fails | Correct Approach | | ----------------------------------------------- | --------------------------------------------------------------------------- | ------------------------------------------------------------------------- | | Using event handlers without $ suffix | Handler cannot be lazy-extracted; forces hydration and defeats resumability | Always use onClick$, onInput$, useTask$() etc. with $ suffix | | Accessing window/document in component body | Throws during SSR where browser globals don't exist | Wrap browser-only code in useVisibleTask$() which runs client-side only | | Using plain variables for reactive state | Variable changes don't trigger UI updates; components become stale | Use useSignal() for primitives; useStore() for objects | | Top-level importing of large client libraries | Bundles library into initial JS payload; destroys zero-JS advantage | Use dynamic import() inside task handlers; lazy-load with $ | | Writing class-based components | Not supported by Qwik's serialization and resumability pipeline | Always use functional components with component$() |

Memory Protocol (MANDATORY)

Before starting:

cat .claude/context/memory/learnings.md

After completing: Record any new patterns or exceptions discovered.

ASSUME INTERRUPTION: Your context may reset. If it's not in memory, it didn't happen.