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Sveltejs Academy · Lesson

Migrating from Svelte 4 to 5

Convert Svelte 4 components to runes with the official migration guide and codemods.

Migration Mindset

Svelte 5 is mostly backward compatible. You can migrate component-by-component.

Official Codemod

Run the migration script to convert legacy syntax automatically.

npx sv migrate svelte-5

All lessons in this course

  1. $state.raw for Non-Reactive State
  2. $derived.by for Complex Derivations
  3. $effect.root for Manual Cleanup
  4. Migrating from Svelte 4 to 5
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