Svelte · Senior · Question 45 of 75

How can you migrate a large Svelte 4 app to Svelte 5 gradually?

✓Correct answer: Components without runes run in legacy mode, so you can migrate file by file; runes-mode and legacy components can be mixed
2All components must be migrated at once
3Svelte 5 can't run Svelte 4 components

Explanation

A component switches to runes mode as soon as it uses a rune, or with <svelte:options runes />.

Further reading

Test yourself

Take the Svelte · Senior quiz: questions and options are shuffled, and you get a review of your mistakes at the end.