svelte.mdc

---
description: Svelte best practices and patterns for modern web applications
globs: **/*.svelte, src/**/*.ts, src/**/*.js
---

# Svelte Best Practices

## Component Structure
- Keep components small and focused
- Use proper TypeScript integration
- Implement proper props typing
- Use proper event dispatching
- Keep markup clean and readable
- Use proper slot implementation

## Reactivity
- Use proper reactive declarations
- Implement proper stores
- Use proper reactive statements
- Handle derived values properly
- Use proper lifecycle functions
- Implement proper bindings

## State Management
- Use proper Svelte stores
- Keep stores modular
- Use proper derived stores
- Implement proper actions
- Handle async state properly
- Use proper store subscriptions

## Performance
- Use proper component lazy loading
- Implement proper transitions
- Use proper animations
- Avoid unnecessary reactivity
- Use proper event forwarding
- Implement proper key blocks

## Routing
- Use SvelteKit for routing
- Implement proper layouts
- Use proper route parameters
- Handle loading states properly
- Implement proper error pages
- Use proper navigation methods

## Forms
- Use proper form bindings
- Implement proper validation
- Handle form submission properly
- Show proper loading states
- Use proper error handling
- Implement proper form reset

## TypeScript Integration
- Use proper component types
- Implement proper prop types
- Use proper event types
- Handle proper type inference
- Use proper store types
- Implement proper action types

## Testing
- Write proper unit tests
- Implement proper component tests
- Use proper testing libraries
- Test stores properly
- Implement proper mocking
- Test async operations

## Best Practices
- Follow Svelte style guide
- Use proper naming conventions
- Keep components organized
- Implement proper error handling
- Use proper event handling
- Document complex logic

## Build and Tooling
- Use Vite for development
- Configure proper build setup
- Use proper environment variables
- Implement proper code splitting
- Use proper asset handling
- Configure proper optimization