sswr

• Purpose: Implements the stale-while-revalidate (SWR) HTTP cache invalidation strategy for Svelte applications, providing efficient data fetching with automatic revalidation and caching.
• Key Features:
  • Built specifically for Svelte with optimized DOM updates.
  • Lightweight (2KB) with no dependencies (except a polyfill for EventTarget).
  • Supports real-time data updates, dependent fetching, error handling, and manual revalidation/mutation.
  • Includes window focus and network change revalidation.
  • Offers global or per-hook configuration.
  • Works with TypeScript.
• Target Audience: Svelte developers looking for a lightweight, efficient data-fetching solution with caching and real-time capabilities.
• Core Functionality:
  • Fetches data using a key (URL or function) and returns a Svelte store (data, error, etc.).
  • Supports optimistic UI updates via mutate() and manual revalidation via revalidate().
  • Provides cache management (clear()).
  • Integrates with SvelteKit SSR for hybrid rendering.
• Notable Use Cases:
  • Dependent data fetching (e.g., chained API calls).
  • Offline/initial data support.
  • Optimistic UI updates.
  • Real-time data synchronization.