What's new in Svelte: December 2023

Svelte Summit Fall 2023 featured talks from across the ecosystem and launches of new Svelte Dev Tools, image optimization, and a preview version of Svelte 5.0. Svelte 5.0 preview includes native support for TypeScript, new runes like $effect.active and $effect.root. SvelteKit has new features like Svelte 5 beta, updated Prettier and prettier-plugin-svelte versions, and support for nodejs20.x via the Vercel adapter. Language Tools has updates in version 108.1.0 and 108.0.0. The article also showcases apps and sites built with Svelte, learning resources, and libraries, tools, and components.