SvelteKit 3 launches with smoother migrations, stronger type safety, Vite-based config, and improved error handling

SvelteKit 3.0 is now available, bringing polish, better type safety, cleaner defaults, and a migration command that automates much of the upgrade process. Key changes include moving configuration to vite.config.ts, replacing the $lib alias with #lib, improving environment variables, simplifying service workers, and strengthening error handling.

The release focuses less on flashy new features and more on framework maturity, signaling SvelteKit’s push toward stability for production teams. Its upcoming remote functions feature points to a broader trend in web frameworks: tighter, type-safe client-server communication built directly into the developer experience.