sveltekit-sse

• Provides an easy way to produce and consume Server-Sent Events (SSE) in SvelteKit applications
• Main purpose is to enable real-time communication between server and client
• Supports both server-side event production and client-side consumption

Key Features:

• Event Production: Simple API to emit events from server routes
• Event Consumption: Client-side API to subscribe to event streams
• Connection Management:
  • Automatic locking mechanism to keep connections alive
  • Cleanup handling when clients disconnect
  • Reconnection support
• Data Transformation:
  • Built-in JSON parsing for incoming messages
  • Custom transformation capabilities
• Customization:
  • Adjustable ping intervals for connection health checks
  • Support for custom headers

Target Audience:

• SvelteKit developers needing real-time features
• Applications requiring server-to-client push notifications
• Use cases where WebSockets would be overkill

Framework Support:

• Primarily designed for SvelteKit
• Server-side compatible with any Node.js environment
• Client-side works with Svelte components

Advanced Use Cases:

• Supports integration with third-party event sources
• Distributed systems friendly (requires external session management)
• Can be combined with database event systems like PostgreSQL notifications

Example Use Cases:

• Real-time updates
• Progress tracking
• Live notifications
• Simple chat applications

Notable Implementation Details:

• Uses a ping mechanism (default 30s interval) to detect disconnected clients
• Provides cleanup hooks for resource management
• Supports connection reuse for multiple subscribers