• A syntax introduced in Svelte 5 that replaces $: reactive statements and store APIs with compiler-level keywords (runes) such as $state, $derived, $effect, etc. Runes are keywords that can only appear in specific positions in the source code, declaring reactive state, derived values, and side-effects directly in the component or module.

1. Related terms: Reactive Manifesto
2. Previous term: Runbook
3. Next term: Runtime
4. Random term: Birthday problem (webglossary.info/random 🎲)