Svelte

Svelte is a component framework that compiles your code to tiny, framework-less vanilla JS. Svelte 5 (2025) introduces "Runes" for explicit reactivity.

When to Use

• High Performance defaults: Svelte apps are tiny and fast by default.
• Embedded Apps: Great for widgets/embeds because of small bundle size.
• Simplicity: HTML, CSS, and JS in one file, with very little boilerplate.

Quick Start (Runes)

<script>
  let count = $state(0);
  let double = $derived(count * 2);