Svelte 5 - Compiler-First Reactive Framework

Overview

Svelte is a compiler-based reactive UI framework that shifts work from runtime to build time. Unlike React/Vue, Svelte compiles components to highly optimized vanilla JavaScript with minimal overhead. Svelte 5 introduces Runes API for explicit, fine-grained reactivity.

Key Features:

• Runes API: $state, $derived, $effect for explicit reactivity
• Zero runtime overhead: Compiles to vanilla JS
• Built-in state management: No external libraries needed
• SvelteKit: Full-stack framework with SSR/SSG/SPA
• Write less code: Simple, readable component syntax
• Exceptional performance: Small bundles, fast runtime

Installation:

# Create new SvelteKit project
npm create svelte@latest my-app
cd my-app