---
description: Template collection for creating different types of Cursor rules for .cursor/rules/**/*
alwaysApply: false
---
# Cursor Rule Templates

This file contains templates for creating different types of Cursor rules based on the [PageAI tutorial](https://pageai.pro/blog/cursor-rules-tutorial).

## NOTE: Always apply these templates when creating new rules.
- Always apply when creating new rules

## Template Categories

### 1. Foundational Rules
### 2. Language-Specific Rules
### 3. Framework-Specific Rules
### 4. Domain-Specific Rules
### 5. Workflow Rules

---

## 1. Foundational Rules

### Meta-Rule Template

```markdown
---
description: How to create and maintain Cursor rules
globs: .cursor/rules/*.mdc
alwaysApply: false
---

# Rule Title

## Purpose
Brief description of what this rule accomplishes.

## When to Apply
- When working with [specific files/patterns]
- When [specific conditions are met]
- When [specific goals are pursued]

## Guidelines

### ✅ DO
- Specific action or pattern to follow
- Example with code

### ❌ DON'T
- Anti-pattern to avoid
- Example of what not to do

## Examples

```language
// Good example
goodExample();

// Bad example
badExample();
```

## References
- Link to related rules: [rule-name](mdc:.cursor/rules/rule-name.mdc)
- Link to external docs: [Documentation](https://example.com)
```

### Self-Improvement Template

```markdown
---
description: Guidelines for continuously improving Cursor rules
globs: **/*
alwaysApply: true
---

# Self-Improving Rules

## Rule Improvement Triggers
- New code patterns not covered by existing rules
- Repeated similar implementations across files
- Common error patterns that could be prevented
- New libraries or tools being used consistently

## Analysis Process
- Compare new code with existing rules
- Identify patterns that should be standardized
- Look for references to external documentation
- Check for consistent error handling patterns

## Rule Updates
- **Add New Rules When**: [criteria]
- **Modify Existing Rules When**: [criteria]
- **Deprecate Rules When**: [criteria]

## Quality Checks
- Rules should be actionable and specific
- Examples should come from actual code
- References should be up to date
- Patterns should be consistently enforced
```

---

## 2. Language-Specific Rules

### Python Template

```markdown
---
description: Python development patterns and conventions
globs: **/*.py
alwaysApply: false
---

# Python Development Rules

## Import Organization

```python
# Standard library imports
import os
import re
from pathlib import Path
from typing import Dict, List, Optional

# Third-party imports
import click
from rich.console import Console

# Local imports
from src.config import config
from src.services.protocols import ServiceProtocol
```

## Function Definitions

```python
def function_name(param1: str, param2: Optional[int] = None) -> ReturnType:
    """Docstring describing the function's purpose.
    
    Args:
        param1: Description of parameter
        param2: Optional parameter description
        
    Returns:
        Description of return value
        
    Raises:
        SpecificError: When and why this error occurs
    """
    # Implementation
    return result
```

## Error Handling

```python
try:
    result = process_data(input_data)
except SpecificError as e:
    logger.error(f"Failed to process data: {e}")
    raise
except Exception as e:
    logger.error(f"Unexpected error: {e}")
    raise
```

## Naming Conventions
- Use `snake_case` for functions and variables
- Use `PascalCase` for classes
- Use `UPPER_CASE` for constants
- Use descriptive names that explain purpose
```

### TypeScript Template

```markdown
---
description: TypeScript development patterns and conventions
globs: **/*.{ts,tsx}
alwaysApply: false
---

# TypeScript Development Rules

## Import Organization

```typescript
// Third-party imports
import React from 'react';
import { useState, useEffect } from 'react';

// Local imports
import { ComponentName } from './ComponentName';
import { useCustomHook } from '../hooks/useCustomHook';
```

## Function Definitions

```typescript
// Function declarations
function functionName(param1: string, param2?: number): ReturnType {
  // Implementation
  return result;
}

// Arrow functions for callbacks
const handleClick = (event: React.MouseEvent): void => {
  // Implementation
};
```

## Type Definitions

```typescript
interface UserData {
  id: string;
  name: string;
  email: string;
  createdAt: Date;
}

type UserStatus = 'active' | 'inactive' | 'pending';
```

## Error Handling

```typescript
try {
  const result = await apiCall();
  return result;
} catch (error) {
  console.error('API call failed:', error);
  throw error;
}
```

## Naming Conventions
- Use `camelCase` for functions and variables
- Use `PascalCase` for components and classes
- Use `UPPER_CASE` for constants
- Use descriptive names that explain purpose
```

---

## 3. Framework-Specific Rules

### React Template

```markdown
---
description: React component development patterns
globs: **/*.{tsx,jsx}
alwaysApply: false
---

# React Development Rules

## Component Structure

```tsx
import React from 'react';

interface ComponentProps {
  title: string;
  onAction?: () => void;
}

export const ComponentName: React.FC<ComponentProps> = ({ 
  title, 
  onAction 
}) => {
  // Hooks at the top
  const [state, setState] = useState<StateType>(initialState);
  
  // Event handlers
  const handleClick = () => {
    // Implementation
  };
  
  // Render
  return (
    <div className="component">
      <h1>{title}</h1>
      <button onClick={handleClick}>Action</button>
    </div>
  );
};
```

## Hooks Usage

```tsx
// Custom hooks
const useCustomHook = (param: string) => {
  const [value, setValue] = useState<string>('');
  
  useEffect(() => {
    // Effect implementation
  }, [param]);
  
  return { value, setValue };
};
```

## State Management

```tsx
// Local state for component-specific data
const [localState, setLocalState] = useState<LocalStateType>(initialState);

// Global state for shared data
const { globalState, updateGlobalState } = useGlobalState();
```

## Performance Optimization

```tsx
// Memoize expensive calculations
const expensiveValue = useMemo(() => {
  return expensiveCalculation(data);
}, [data]);

// Memoize callbacks
const handleCallback = useCallback(() => {
  // Implementation
}, [dependencies]);
```
```

---

## 4. Domain-Specific Rules

### API Development Template

```markdown
---
description: API development patterns and conventions
globs: **/api/**/*.{py,ts,js}
alwaysApply: false
---

# API Development Rules

## Endpoint Structure

```python
# Python (FastAPI/Flask)
@app.get("/api/v1/resource/{resource_id}")
async def get_resource(resource_id: str) -> ResourceResponse:
    """Get a specific resource by ID."""
    try:
        resource = await resource_service.get_by_id(resource_id)
        return ResourceResponse(data=resource)
    except ResourceNotFoundError:
        raise HTTPException(status_code=404, detail="Resource not found")
```

```typescript
// TypeScript (Express/Next.js)
app.get('/api/v1/resource/:resourceId', async (req, res) => {
  try {
    const { resourceId } = req.params;
    const resource = await resourceService.getById(resourceId);
    res.json({ data: resource });
  } catch (error) {
    res.status(404).json({ error: 'Resource not found' });
  }
});
```

## Error Handling

```python
# Standard error responses
class APIError(Exception):
    def __init__(self, message: str, status_code: int = 400):
        self.message = message
        self.status_code = status_code

# Error response format
{
  "error": {
    "message": "Error description",
    "code": "ERROR_CODE",
    "details": {}
  }
}
```

## Request/Response Validation

```python
# Request validation
class CreateResourceRequest(BaseModel):
    name: str
    description: Optional[str] = None
    tags: List[str] = []

# Response validation
class ResourceResponse(BaseModel):
    data: Resource
    meta: Optional[Dict[str, Any]] = None
```

## Security

```python
# Authentication
@require_auth
async def protected_endpoint():
    # Implementation

# Rate limiting
@rate_limit(max_requests=100, window=3600)
async def rate_limited_endpoint():
    # Implementation
```
```

---

## 5. Workflow Rules

### Testing Template

```markdown
---
description: Testing patterns and conventions
globs: **/*test*.{py,ts,js}
alwaysApply: false
---

# Testing Rules

## Test Structure

```python
# Python (pytest)
def test_function_name():
    """Test description."""
    # Arrange
    input_data = "test input"
    expected_output = "expected result"
    
    # Act
    result = function_to_test(input_data)
    
    # Assert
    assert result == expected_output
```

```typescript
// TypeScript (Jest)
describe('ComponentName', () => {
  it('should render correctly', () => {
    // Arrange
    const props = { test: 'value' };
    
    // Act
    render(<ComponentName {...props} />);
    
    // Assert
    expect(screen.getByText('expected text')).toBeInTheDocument();
  });
});
```

## Test Organization

```python
# Test file structure
class TestUserService:
    def setup_method(self):
        """Set up test fixtures."""
        self.user_service = UserService()
    
    def test_create_user_success(self):
        """Test successful user creation."""
        # Test implementation
    
    def test_create_user_failure(self):
        """Test user creation failure."""
        # Test implementation
```

## Mocking

```python
# Python mocking
@patch('module.function_name')
def test_with_mock(mock_function):
    mock_function.return_value = "mocked result"
    # Test implementation
```

```typescript
// TypeScript mocking
jest.mock('../api/userApi');
const mockUserApi = userApi as jest.Mocked<typeof userApi>;
```

## Test Data

```python
# Test fixtures
@pytest.fixture
def sample_user():
    return User(
        id="test-id",
        name="Test User",
        email="test@example.com"
    )

@pytest.fixture
def sample_user_data():
    return {
        "id": "test-id",
        "name": "Test User",
        "email": "test@example.com"
    }
```

## Testing Best Practices
- Write tests for both success and failure cases
- Use descriptive test names that explain the scenario
- Follow AAA pattern (Arrange, Act, Assert)
- Mock external dependencies
- Test edge cases and error conditions
- Keep tests independent and isolated
```

---

## Usage Instructions

1. **Copy the appropriate template** for your use case
2. **Customize the content** based on your project's patterns
3. **Add specific examples** from your codebase
4. **Update the frontmatter** with correct description and globs
5. **Save as `.mdc` file** in `.cursor/rules/` directory

## Template Customization Tips

- **Replace placeholder text** with actual project-specific content
- **Add real examples** from your codebase
- **Include common patterns** that your team follows
- **Reference existing rules** using `mdc:` links
- **Keep templates focused** on specific domains or patterns
---
description: Template collection for creating different types of Cursor rules
globs: **/*
alwaysApply: false
---