What's new in Svelte, June 2025

6 days ago 2

In addition to advancing the work on Async Svelte, the maintainers have been hard at work introducing long requested features like Attachments.

This month, we’ll share a bit about the new API along with a huge showcase of apps/sites built with Svelte...

Let’s dive in!

What’s new in Svelte and SvelteKit

Attachments are essentially a more flexible and modern version of actions. Read more about their use-cases and improvements over actions in the PR (#1500) or in the Svelte docs ([email protected], [email protected])
Do you have actions you love and want to use them as attachments? The fromAction utility lets you convert actions into attachments ([email protected], #15933)
Generics are now allowed on snippets - improving typing and type hints ([email protected], [email protected], #15915)
The Svelte extension will now allow you to add missing imports on save ([email protected], #2744)
State fields can now be declared inside class constructors ([email protected], #15820)
Svelte is now XHTML compliant and the new fragments: 'html' | 'tree' option adds wider CSP compliance ([email protected], #15538)
Client-side code is now allowed to run at the top-level of universal pages/layouts when SSR is disabled and page options are only boolean or string literals ([email protected], #13684)

For a full list of bug fixes in Svelte, SvelteKit and its adapters, check out their CHANGELOGs here and here.

Whimsy is a small game engine and a fantasy console for making interactive stories
DASHBOT is a 1v1 Space Robot Sprint Battle game for two players - with local and online modes
Kraa is a web-based markdown editor that does things a little differently
Shovel AI is a batch tool for interacting with large amounts of a text data with AI models
md.uy is a collaborative, local-first, peer-to-peer markdown editor
BringYourAI is a browser extension that provides instant codebase context on any AI chat website
Joe Malatesta figured out a way to present his film photos in a digital environment
Notion Avatar is a Notion-style avatar editor with Svelte 5 Runes
ORBITS is your second brain for who you know and who you meet

Featuring Svelte Contributors and Ambassadors

In case you missed it, all the videos from Svelte Summit are released over the course of the next few days on Svelte Society YouTube. More on how that happened in last month’s blog post
Svelte Attachments Are Here And They’re Awesome by Joy of Code
SvelteBench (from Stanislav Khromov) shows how different AI models perform out of the box on Svelte 5 syntax - now updated with Anthropic’s new Claude 4 models
First look at GitHub Copilot Coding Agent - The $40/month AI developer that actually works! by Stanislav Khromov (video)
Truly Native Apps with Svelte? by Paolo Ricciuti

This Week in Svelte

To Watch/Read

Bits UI v2 released - with support for attachments, $props.id(), Shadow DOM, and more
Composably is a content processing plugin for Vite and SvelteKit with typed content + dynamic Svelte components at build time
Svelte Flow is now 1.0 - with Svelte 5 support, TSDoc and a bunch of new features to make interactive flow charts even better
fox ui is a collection UI components built with Tailwind 4 and Svelte 5 - now with a rich text editor
fluid-dnd is a drag and drop library for Vue, React and Svelte
sveltekit-password-protect is a simple utility to add a layer of protection to your websites
sveltekit-image-optimize is a simple utility that helps you create an endpoint of your svelte app that optimizes your images
[email protected] introduces Panels - a fixed-position resizable panel / drawer that separates the debugging UI from flow of your website
nuqs-svelte is an unnoficial Svelte port of nuqs library - a type-safe search params state manager
sv-router is a type-safe SPA router with file-based or code-based routing
svelte-textcircle displays text in a circular layout with customizable animations and styling