Svelte 4: Updated Performance and Developer Experience

2023/06/22

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The Svelte Team Jun 22, 2023

The Svelte team has announced the stable release of Svelte 4, after months of hard work. Svelte 3 was released more than four years ago, and Svelte 4 takes advantage of the improvements in Node.js and browser APIs that have happened since then. This release is mainly a maintenance release, bumping minimum version requirements and tightening up the design in specific areas. It sets the stage for the next generation of Svelte to be released as Svelte 5.

Svelte is a powerful language that allows developers to easily put together web UIs leveraging the power of HTML, CSS, JS, and the Svelte compiler. Svelte 4 comes with updated performance and developer experience. The release results in smaller and faster hydration code. SvelteKit users can see their compiled output shrink in size by examining the .svelte-kit/output/client/_app/immutable/nodes folder. For example, on kit.svelte.dev, the JS generated across the whole site was reduced in size by 12.7% (126.3 kB to 110.2 kB).

If you're new to Svelte, you can take it for a spin in the interactive tutorial, on StackBlitz, or locally with npm create svelte@latest. Svelte 4 is a great choice for developers who want to keep up with the latest news in the industry. Watch Svelte Radio Live to learn more about this release.