The Raw Power of Svelte 5 Runes: 70 Components, 25 KB, Full Reactivity

Svelte 5 Runes in Production: What We Learned Building 70+ Components When Svelte 5 shipped runes, the community split in two. One side said "you're just copying React." The other saw the future of reactivity. We just started writing code. 70+ components later, powering HostingSift (a hosting comparison platform), here's what we actually know. What runes are and why you should care Runes are compiler instructions. They look like functions ( $state() , $derived() , $effect() ), but they're not. Svelte transforms them at build time, not at runtime. That's the key difference from React hooks, Vue composables, and everything else out there. In Svelte 4, reactivity was implicit. Write let count = 0 and the compiler decides when to update the DOM. It worked, but it had traps. $: blocks got confusing with complex logic, and the line between "reactive" and "just a variable" was blurry. Runes fix that with explicit signals: <script lang= "ts" > let hostings = $state < Hosting [] > ([]) let load