Svelte 5 Migration: Experiences and Caveats

A recent update on a complex web application highlights the challenges and best practices for migrating to Svelte 5. The article emphasizes the importance of manual migration over relying on the auto-migration script, particularly when dealing with reactive variable declarations.

Key takeaways include:

* Manually updating components ensures more control and avoids potential issues.

* $effect() runs only client-side, making it unsuitable for server-side rendering (SSR) or prerendering pages.

* $derived() or $derived.by(() => {}) are recommended alternatives to avoid flicker issues.

Source: https://dev.to/kvetoslavnovak/experiences-and-caveats-of-svelte-5-migration-27cp