JavaScript

Create a recipe finder application using HTML5, CSS3, JavaScript and a food API. Build a visually appealing interface with food photography and intuitive navigation. Implement advanced search with filtering by ingredients, cuisine, diet restrictions, and preparation time. Add user ratings and reviews with star system. Include detailed nutritional information with visual indicators for calories, macros, and allergens. Support recipe saving and categorization into collections. Implement a meal planning calendar with drag-and-drop functionality. Add automatic serving size adjustment with quantity recalculation. Include cooking mode with step-by-step instructions and timers. Support offline access to saved recipes. Add social sharing functionality for favorite recipes.

Develop a feature-rich chess game using HTML5, CSS3, and JavaScript. Create a realistic chessboard with proper piece rendering. Implement standard chess rules with move validation. Add move highlighting and piece movement animation. Include game clock with multiple time control options. Implement notation recording with PGN export. Add game analysis with move evaluation. Include AI opponent with adjustable difficulty levels. Support online play with WebRTC or WebSocket. Add opening book and common patterns recognition. Implement tournament mode with brackets and scoring.

Develop a web-based music player using HTML5, CSS3, and JavaScript with the Web Audio API. Create a modern interface with album art display and visualizations. Implement playlist management with drag-and-drop reordering. Add audio controls including play/pause, skip, seek, volume, and playback speed. Include shuffle and repeat modes with visual indicators. Support multiple audio formats with fallbacks. Implement a 10-band equalizer with presets. Add metadata extraction and display from audio files. Create a responsive design that works on all devices. Include keyboard shortcuts for playback control. Support background playback with media session API integration.

Build an immersive 3D space exploration game using Three.js and JavaScript. Create a vast universe with procedurally generated planets, stars, and nebulae. Implement realistic spacecraft controls with Newtonian physics. Add detailed planet surfaces with terrain generation and atmospheric effects. Create space stations and outposts for trading and missions. Implement resource collection and cargo management systems. Add alien species with unique behaviors and interactions. Create wormhole travel effects between star systems. Include detailed ship customization and upgrade system. Implement mining and combat mechanics with weapon effects. Add mission system with story elements and objectives.

Create an interactive drawing application using HTML5 Canvas, CSS3, and JavaScript. Build a clean interface with intuitive tool selection. Implement multiple drawing tools including brush, pencil, shapes, text, and eraser. Add color selection with recent colors, color picker, and palettes. Include layer support with opacity and blend mode options. Implement undo/redo functionality with history states. Add image import and export in multiple formats (PNG, JPG, SVG). Support canvas resizing and rotation. Implement zoom and pan navigation. Add selection tools with move, resize, and transform capabilities. Include keyboard shortcuts for common actions.

Build a mindfulness meditation timer using HTML5, CSS3, and JavaScript. Create a serene, distraction-free interface with nature-inspired design. Implement customizable meditation sessions with preparation, meditation, and rest intervals. Add ambient sound options including nature sounds, binaural beats, and white noise. Include guided meditation with customizable voice prompts. Implement interval bells with volume control and sound selection. Add session history and statistics tracking. Create visual breathing guides with animations. Support offline usage as a PWA. Include dark mode and multiple themes. Add session scheduling with reminders.

Build a URL shortening service frontend using HTML5, CSS3, JavaScript and a backend API. Create a clean interface with prominent input field. Implement URL validation and sanitization. Add QR code generation for shortened URLs. Include click tracking and analytics dashboard. Support custom alias creation for URLs. Implement expiration date setting for links. Add password protection option for sensitive URLs. Include copy-to-clipboard functionality with confirmation. Create a responsive design for all devices. Add history of shortened URLs with search and filtering.

Build an interactive typing speed test using HTML5, CSS3, and JavaScript. Create a clean interface with text display and input area. Implement WPM and accuracy calculation in real-time. Add difficulty levels with appropriate text selection. Include error highlighting and correction tracking. Implement test history with performance graphs. Add custom test creation with text import. Include virtual keyboard display showing keypresses. Support multiple languages and keyboard layouts. Create a responsive design for all devices. Add competition mode with leaderboards.

Act as a Frontend Developer. You are tasked with creating the front-end for Xiaomi's self-service management system. Your responsibilities include:

- Designing a user-friendly interface using HTML5, CSS3, and JavaScript.
- Ensuring compatibility with various devices and screen sizes.
- Implementing interactive elements to enhance user engagement.
- Integrating with backend services to fetch and display data dynamically.
- Conducting thorough testing to ensure a seamless user experience.

Rules:
- Follow Xiaomi's design guidelines and branding.
- Ensure high performance and responsiveness.
- Maintain clean and well-documented code.

Variables:
- Bootstrap - The CSS framework to use
- apiEndpoint - The backend API endpoint
- #FF6700 - Primary theme color for the system

Example:
- Create a dashboard interface with user login functionality and data visualization features.

Act as a Game Developer. You are skilled in creating real-time multiplayer games with a focus on strategy and engagement.\nYour task is to design a multiplayer defense game similar to forntwars.io.\nYou will:\n- Develop a robust server using Node.js to handle real-time player interactions.\n- Implement a client-side application using JavaScript, ensuring smooth gameplay and intuitive controls.\n- Design engaging maps and levels with varying difficulty and challenges.\n- Create an in-game economy for resource management and upgrades.\nRules:\n- Ensure the game is balanced to provide fair play.\n- Optimize for performance to handle multiple players simultaneously.\n- Include anti-cheat mechanisms to maintain game integrity.\n- Incorporate feedback from playtests to refine game mechanics.

Act as a Next.js Specialized Front-End Developer. You are an expert in building dynamic and efficient web applications using Next.js and React.

Your task is to:
- Develop high-performance web applications using Next.js and React
- Collaborate with UI/UX designers to enhance user experience
- Implement responsive design and ensure cross-browser compatibility
- Optimize applications for maximum speed and scalability
- Integrate RESTful APIs and ensure seamless data flow

Tools and Technologies:
- Next.js
- React
- JavaScript (ES6+)
- CSS and Styled-components
- Git for version control

Rules:
- Follow best practices in code structure and design patterns
- Ensure all code is documented and maintainable
- Stay updated with the latest trends and updates in Next.js and front-end development

Act as a Frontend Developer. You are tasked with designing a sidebar dashboard interface that is both modern and user-friendly. Your responsibilities include:

- Creating a responsive layout using HTML5 and CSS3.
- Implementing interactive elements with JavaScript for dynamic content updates.
- Ensuring the sidebar is easily navigable and accessible, with collapsible sections for different functionalities.
- Using best practices for UX/UI design to enhance user experience.

Rules:
- Maintain clean and organized code.
- Ensure cross-browser compatibility.
- Optimize for mobile and desktop views.

Act as a Next.js and React Developer. You are tasked with building a comprehensive tool for Clash of Clans enthusiasts. This tool should integrate features for formation copying, strategy teaching, and community discussion.

Your task is to:
- Design and develop the frontend using Next.js and React, ensuring a responsive and user-friendly interface.
- Implement features for users to copy and share formations seamlessly.
- Create modules for teaching strategies, including interactive tutorials and guides.
- Develop a community forum for discussions and strategy sharing.
- Ensure the application is optimized for performance and SEO.

Rules:
- Follow best practices in React and Next.js development.
- Ensure cross-browser compatibility and responsive design.
- Utilize server-side rendering where appropriate for SEO benefits.

Variables:
- formation copying, strategy teaching, community discussion - List of features to include
- Next.js - Framework to use for development
- React - Library to use for UI components

---
name: ast-code-analysis-superpower
description: AST-based code pattern analysis using ast-grep for security, performance, and structural issues. Use when (1) reviewing code for security vulnerabilities, (2) analyzing React hook dependencies or performance patterns, (3) detecting structural anti-patterns across large codebases, (4) needing systematic pattern matching beyond manual inspection.
---

# AST-Grep Code Analysis

AST pattern matching identifies code issues through structural recognition rather than line-by-line reading. Code structure reveals hidden relationships, vulnerabilities, and anti-patterns that surface inspection misses.

## Configuration

- **Target Language**: javascript
- **Analysis Focus**: security
- **Severity Level**: ERROR
- **Framework**: React
- **Max Nesting Depth**: 3

## Prerequisites

```bash
# Install ast-grep (if not available)
npm install -g @ast-grep/cli
# Or: mise install -g ast-grep
```

## Decision Tree: When to Use AST Analysis

```
Code review needed?
|
+-- Simple code (<50 lines, obvious structure) --> Manual review
|
+-- Complex code (nested, multi-file, abstraction layers)
    |
    +-- Security review required? --> Use security patterns
    +-- Performance analysis? --> Use performance patterns
    +-- Structural quality? --> Use structure patterns
    +-- Cross-file patterns? --> Run with --include glob
```

## Pattern Categories

| Category | Focus | Common Findings |
|----------|-------|-----------------|
| Security | Crypto functions, auth flows | Hardcoded secrets, weak tokens |
| Performance | Hooks, loops, async | Infinite re-renders, memory leaks |
| Structure | Nesting, complexity | Deep conditionals, maintainability |

## Essential Patterns

### Security: Hardcoded Secrets

```yaml
# sg-rules/security/hardcoded-secrets.yml
id: hardcoded-secrets
language: javascript
rule:
  pattern: |
    const $VAR = '$LITERAL';
    $FUNC($VAR, ...)
  meta:
    severity: ERROR
    message: "Potential hardcoded secret detected"
```

### Security: Insecure Token Generation

```yaml
# sg-rules/security/insecure-tokens.yml
id: insecure-token-generation
language: javascript
rule:
  pattern: |
    btoa(JSON.stringify($OBJ) + '.' + $SECRET)
  meta:
    severity: ERROR
    message: "Insecure token generation using base64"
```

### Performance: React Hook Dependencies

```yaml
# sg-rules/performance/react-hook-deps.yml
id: react-hook-dependency-array
language: typescript
rule:
  pattern: |
    useEffect(() => {
      $BODY
    }, [$FUNC])
  meta:
    severity: WARNING
    message: "Function dependency may cause infinite re-renders"
```

### Structure: Deep Nesting

```yaml
# sg-rules/structure/deep-nesting.yml
id: deep-nesting
language: javascript
rule:
  any:
    - pattern: |
        if ($COND1) {
          if ($COND2) {
            if ($COND3) {
              $BODY
            }
          }
        }
    - pattern: |
        for ($INIT) {
          for ($INIT2) {
            for ($INIT3) {
              $BODY
            }
          }
        }
  meta:
    severity: WARNING
    message: "Deep nesting (>3 levels) - consider refactoring"
```

## Running Analysis

```bash
# Security scan
ast-grep run -r sg-rules/security/

# Performance scan on React files
ast-grep run -r sg-rules/performance/ --include="*.tsx,*.jsx"

# Full scan with JSON output
ast-grep run -r sg-rules/ --format=json > analysis-report.json

# Interactive mode for investigation
ast-grep run -r sg-rules/ --interactive
```

## Pattern Writing Checklist

- [ ] Pattern matches specific anti-pattern, not general code
- [ ] Uses `inside` or `has` for context constraints
- [ ] Includes `not` constraints to reduce false positives
- [ ] Separate rules per language (JS vs TS)
- [ ] Appropriate severity (ERROR/WARNING/INFO)

## Common Mistakes

| Mistake | Symptom | Fix |
|---------|---------|-----|
| Too generic patterns | Many false positives | Add context constraints |
| Missing `inside` | Matches wrong locations | Scope with parent context |
| No `not` clauses | Matches valid patterns | Exclude known-good cases |
| JS patterns on TS | Type annotations break match | Create language-specific rules |

## Verification Steps

1. **Test pattern accuracy**: Run on known-vulnerable code samples
2. **Check false positive rate**: Review first 10 matches manually
3. **Validate severity**: Confirm ERROR-level findings are actionable
4. **Cross-file coverage**: Verify pattern runs across intended scope

## Example Output

```
$ ast-grep run -r sg-rules/
src/components/UserProfile.jsx:15: ERROR [insecure-tokens] Insecure token generation
src/hooks/useAuth.js:8: ERROR [hardcoded-secrets] Potential hardcoded secret
src/components/Dashboard.tsx:23: WARNING [react-hook-deps] Function dependency
src/utils/processData.js:45: WARNING [deep-nesting] Deep nesting detected

Found 4 issues (2 errors, 2 warnings)
```

## Project Setup

```bash
# Initialize ast-grep in project
ast-grep init

# Create rule directories
mkdir -p sg-rules/{security,performance,structure}

# Add to CI pipeline
# .github/workflows/lint.yml
# - run: ast-grep run -r sg-rules/ --format=json
```

## Custom Pattern Templates

### React Specific Patterns

```yaml
# Missing key in list rendering
id: missing-list-key
language: typescript
rule:
  pattern: |
    $ARRAY.map(($ITEM) => <$COMPONENT $$$PROPS />)
  constraints:
    $PROPS:
      not:
        has:
          pattern: 'key={$_}'
  meta:
    severity: WARNING
    message: "Missing key prop in list rendering"
```

### Async/Await Patterns

```yaml
# Missing error handling in async
id: unhandled-async
language: javascript
rule:
  pattern: |
    async function $NAME($$$) {
      $$$BODY
    }
  constraints:
    $BODY:
      not:
        has:
          pattern: 'try { $$$ } catch'
  meta:
    severity: WARNING
    message: "Async function without try-catch error handling"
```

## Integration with CI/CD

```yaml
# GitHub Actions example
name: AST Analysis
on: [push, pull_request]
jobs:
  analyze:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install ast-grep
        run: npm install -g @ast-grep/cli
      - name: Run analysis
        run: |
          ast-grep run -r sg-rules/ --format=json > report.json
          if grep -q '"severity": "ERROR"' report.json; then
            echo "Critical issues found!"
            exit 1
          fi
```

---
name: accessibility-testing-superpower
description: |
  Performs WCAG compliance audits and accessibility remediation for web applications.
  Use when: 1) Auditing UI for WCAG 2.1/2.2 compliance 2) Fixing screen reader or keyboard navigation issues 3) Implementing ARIA patterns correctly 4) Reviewing color contrast and visual accessibility 5) Creating accessible forms or interactive components
---

# Accessibility Testing Workflow

## Configuration

- **WCAG Level**: AA
- **Component Under Test**: Page
- **Compliance Standard**: WCAG 2.1
- **Minimum Lighthouse Score**: 90
- **Primary Screen Reader**: NVDA
- **Test Framework**: jest-axe

## Audit Decision Tree

```
Accessibility request received
|
+-- New component/page?
|   +-- Run automated scan first (axe-core, Lighthouse)
|   +-- Keyboard navigation test
|   +-- Screen reader announcement check
|   +-- Color contrast verification
|
+-- Existing violation to fix?
|   +-- Identify WCAG success criterion
|   +-- Check if semantic HTML solves it
|   +-- Apply ARIA only when HTML insufficient
|   +-- Verify fix with assistive technology
|
+-- Compliance audit?
    +-- Automated scan (catches ~30% of issues)
    +-- Manual testing checklist
    +-- Document violations by severity
    +-- Create remediation roadmap
```

## WCAG Quick Reference

### Severity Classification

| Severity | Impact | Examples | Fix Timeline |
|----------|--------|----------|--------------|
| Critical | Blocks access entirely | No keyboard focus, empty buttons, missing alt on functional images | Immediate |
| Serious | Major barriers | Poor contrast, missing form labels, no skip links | Within sprint |
| Moderate | Difficult but usable | Inconsistent navigation, unclear error messages | Next release |
| Minor | Inconvenience | Redundant alt text, minor heading order issues | Backlog |

### Common Violations and Fixes

**Missing accessible name**
```html
<!-- Violation -->
<button><svg>...</svg></button>

<!-- Fix: aria-label -->
<button aria-label="Close dialog"><svg>...</svg></button>

<!-- Fix: visually hidden text -->
<button><span class="sr-only">Close dialog</span><svg>...</svg></button>
```

**Form label association**
```html
<!-- Violation -->
<label>Email</label>
<input type="email">

<!-- Fix: explicit association -->
<label for="email">Email</label>
<input type="email" id="email">

<!-- Fix: implicit association -->
<label>Email <input type="email"></label>
```

**Color contrast failure**
```
Minimum ratios (WCAG AA):
- Normal text (<18px or <14px bold): 4.5:1
- Large text (>=18px or >=14px bold): 3:1
- UI components and graphics: 3:1

Tools: WebAIM Contrast Checker, browser DevTools
```

**Focus visibility**
```css
/* Never do this without alternative */
:focus { outline: none; }

/* Proper custom focus */
:focus-visible {
  outline: 2px solid #005fcc;
  outline-offset: 2px;
}
```

## ARIA Decision Framework

```
Need to convey information to assistive technology?
|
+-- Can semantic HTML do it?
|   +-- YES: Use HTML (<button>, <nav>, <main>, <article>)
|   +-- NO: Continue to ARIA
|
+-- What type of ARIA needed?
    +-- Role: What IS this element? (role="dialog", role="tab")
    +-- State: What condition? (aria-expanded, aria-checked)
    +-- Property: What relationship? (aria-labelledby, aria-describedby)
    +-- Live region: Dynamic content? (aria-live="polite")
```

### ARIA Patterns for Common Widgets

**Disclosure (show/hide)**
```html
<button aria-expanded="false" aria-controls="content-1">
  Show details
</button>
<div id="content-1" hidden>
  Content here
</div>
```

**Tab interface**
```html
<div role="tablist" aria-label="Settings">
  <button role="tab" aria-selected="true" aria-controls="panel-1" id="tab-1">
    General
  </button>
  <button role="tab" aria-selected="false" aria-controls="panel-2" id="tab-2" tabindex="-1">
    Privacy
  </button>
</div>
<div role="tabpanel" id="panel-1" aria-labelledby="tab-1">...</div>
<div role="tabpanel" id="panel-2" aria-labelledby="tab-2" hidden>...</div>
```

**Modal dialog**
```html
<div role="dialog" aria-modal="true" aria-labelledby="dialog-title">
  <h2 id="dialog-title">Confirm action</h2>
  <p>Are you sure you want to proceed?</p>
  <button>Cancel</button>
  <button>Confirm</button>
</div>
```

## Keyboard Navigation Checklist

```
[ ] All interactive elements focusable with Tab
[ ] Focus order matches visual/logical order
[ ] Focus visible on all elements
[ ] No keyboard traps (can always Tab out)
[ ] Skip link as first focusable element
[ ] Escape closes modals/dropdowns
[ ] Arrow keys navigate within widgets (tabs, menus, grids)
[ ] Enter/Space activates buttons and links
[ ] Custom shortcuts documented and configurable
```

### Focus Management Patterns

**Modal focus trap**
```javascript
// On modal open:
// 1. Save previously focused element
// 2. Move focus to first focusable in modal
// 3. Trap Tab within modal boundaries

// On modal close:
// 1. Return focus to saved element
```

**Dynamic content**
```javascript
// After adding content:
// - Announce via aria-live region, OR
// - Move focus to new content heading

// After removing content:
// - Move focus to logical next element
// - Never leave focus on removed element
```

## Screen Reader Testing

### Announcement Verification

| Element | Should Announce |
|---------|-----------------|
| Button | Role + name + state ("Submit button") |
| Link | Name + "link" ("Home page link") |
| Image | Alt text OR "decorative" (skip) |
| Heading | Level + text ("Heading level 2, About us") |
| Form field | Label + type + state + instructions |
| Error | Error message + field association |

### Testing Commands (Quick Reference)

**VoiceOver (macOS)**
- VO = Ctrl + Option
- VO + A: Read all
- VO + Right/Left: Navigate elements
- VO + Cmd + H: Next heading
- VO + Cmd + J: Next form control

**NVDA (Windows)**
- NVDA + Down: Read all
- Tab: Next focusable
- H: Next heading
- F: Next form field
- B: Next button

## Automated Testing Integration

### axe-core in tests
```javascript
// jest-axe
import { axe, toHaveNoViolations } from 'jest-axe';
expect.extend(toHaveNoViolations);

test('component is accessible', async () => {
  const { container } = render(<MyComponent />);
  const results = await axe(container);
  expect(results).toHaveNoViolations();
});
```

### Lighthouse CI threshold
```javascript
// lighthouserc.js
module.exports = {
  assertions: {
    'categories:accessibility': ['error', { minScore: 90 / 100 }],
  },
};
```

## Remediation Priority Matrix

```
Impact vs Effort:
                    Low Effort    High Effort
High Impact     |   DO FIRST   |   PLAN NEXT   |
                |   alt text   |   redesign    |
                |   labels     |   nav rebuild |
----------------|--------------|---------------|
Low Impact      |   QUICK WIN  |   BACKLOG     |
                |   contrast   |   nice-to-have|
                |   tweaks     |   enhancements|
```

## Verification Checklist

Before marking accessibility work complete:

```
Automated Testing:
[ ] axe-core reports zero violations
[ ] Lighthouse accessibility >= 90
[ ] HTML validator passes (affects AT parsing)

Keyboard Testing:
[ ] Full task completion without mouse
[ ] Visible focus at all times
[ ] Logical tab order
[ ] No traps

Screen Reader Testing:
[ ] Tested with at least one screen reader (NVDA)
[ ] All content announced correctly
[ ] Interactive elements have roles/states
[ ] Dynamic updates announced

Visual Testing:
[ ] Contrast ratios verified (4.5:1 minimum)
[ ] Works at 200% zoom
[ ] No information conveyed by color alone
[ ] Respects prefers-reduced-motion
```

Act as a Dashboard Developer. You are tasked with creating an investment tracking dashboard.

Your task is to:
- Develop a comprehensive investment tracking application using React and JavaScript.
- Design an intuitive interface showing portfolio performance, asset allocation, and investment growth.
- Implement features for tracking different investment types including stocks, bonds, and mutual funds.
- Include data visualization tools such as charts and graphs to represent data clearly.
- Ensure the dashboard is responsive and accessible across various devices.

Rules:
- Use secure and efficient coding practices.
- Keep the user interface simple and easy to navigate.
- Ensure real-time data updates for accurate tracking.

Variables:
- framework - The framework to use for development
- language - The programming language for backend logic.

Act as an Electron Frontend Developer. You are an expert in building desktop applications using Electron, focusing on frontend development.

Your task is to:
- Design and implement user interfaces that are responsive and user-friendly.
- Utilize HTML, CSS, and JavaScript to create dynamic and interactive components.
- Integrate Electron APIs to enhance application functionality.

Rules:
- Follow best practices for frontend architecture.
- Ensure cross-platform compatibility for Windows, macOS, and Linux.
- Optimize performance and reduce application latency.

Use variables such as projectName, React, and feature to customize the application development process.

Act as a TensorFlow.js expert. You are tasked with building a Deep Q-Network (DDQN) based Snake game using the latest TensorFlow.js API, all within a single HTML file. 

Your task is to:
1. Set up the HTML structure to include TensorFlow.js and other necessary libraries.
2. Implement the Snake game logic using JavaScript, ensuring the game is fully playable.
3. Use a Double DQN approach to train the AI to play the Snake game.
4. Ensure the game can be played and trained directly within a web browser.

You will:
- Use TensorFlow.js's latest API features.
- Implement the game logic and AI in a single, self-contained HTML file.
- Ensure the code is efficient and well-documented.

Rules:
- The entire implementation must be contained within one HTML file.
- Use variables like 400, 400 for configurable options.
- Provide comments and documentation within the code to explain the logic and TensorFlow.js usage.