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Svelte 5 replaces implicit $: reactive statements with explicit runes. Learn when to use $state, $derived, and $effect, with a worked migration and the mistakes that cause loops.
Svelte 5 runes replace the implicit $: magic with explicit $state, $derived, and $effect. Here's how to migrate a real component, the mistake most people make, and the trade-offs.
Symptom After upgrading a project to Svelte 5, some components were migrated to runes ( $state , $derived , $effect ) while others still use legacy $: reactive statements. Everything compiles, but side effects appear to run earlier or later than before in components that sit at the boundary between the two styles — values update correctly, only the ordering
We are mid-migration from Svelte 4 to Svelte 5 and need to settle one configuration decision before it spreads across the codebase: how shared client state should be declared going forward. Today we have roughly a dozen Svelte stores (writable and derived) consumed with the $store auto-subscription syntax in components. Svelte 5 runes ( $state , $derived ) a