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Thanks to the number of folks who have been trying the Svelte 5 release candidates, the maintainers have been hard at work in addressing bugs and implementing performance improvements for the upcoming release. This month, we'll cover the most notable changes along with the many apps, resources and libraries that the community has created over the last few weeks.
What's new in Svelte
Have you been wanting to migrate your project to Svelte 5? Want to test out the migration tool and give the team feedback? Then you should give the svelte-migrate tool a try! npx svelte-migrate svelte-5
is all you need to get started. If you run into any problems, please file an issue.
Here's what else is new...
Legacy components can now be manually instantiated asynchronously with the
sync
option (5.0.0-next.237, #12970)The
each
block is now much better in SSR mode - removing an unnecessary declaration and caching the length of the array before iterating over it (5.0.0-next.242, #13060)A callstack will now appear if an infinite loop is detected - with the last ten effects printed out - in development mode (5.0.0-next.246, #13231)
Projects that use
@sveltejs/enhanced-img
should see a much smaller bundle thanks to module variables being inlined into the template (5.0.0-next.246, #13075)There are now a11y warnings for
<button>
/<a>
elements that are missing an aria-label and content (5.0.0-next.250, #13130)Animations now take into account
zoom
when calculating transforms (5.0.0-next.254, #13317)<svelte:self>
is now deprecated in runes mode. It's not necessary since components can now import themselves (5.0.0-next.256, #13333)svelte-check
, the CLI is used by almost every Svelte project, is now much smaller (repo, post)
Curious to see all that the maintainers have been up to in getting Svelte 5 production ready? Check out the CHANGELOG to see all the fixes - big and small!
What's new in SvelteKit and Language Tools
SvelteKit now suports typed arrays in
load
functions. It's "not something to over-use, since it uses base64 encoding which is 33% larger than the raw data, but useful when you need it"(2.6.0, #12716)Components typed through Svelte 5's
Component
interface get proper intellisense (extensions-109.0.1)
Community Showcase
Apps & Sites built with Svelte
svelte0.dev lets you generate Svelte UIs using
shadcn/ui
via a text promptMini Spreadsheet Component is a great introduction to how reactivity works in Svelte
Poof is a self-destructing notes app that includes features like an optional to do list, email alerts and deleting after a specific date
kunft is a cloud platform for deploying docker containers and apps directly from GitHub
quickprompt is a browser extension to make saving and retrieving ChatGPT prompts easy
Dither is a lo-fi GIF chat app inspired by Return of the Obra Dinn and Meatspac.es
cobalt helps you save anything from your favorite websites: video, audio, photos or gifs
YouTube Looper is a custom loops extension for Youtube videos
LeetLink is a linktree-a-like with customizable themes
WhatChord is a chord finder for piano
AIUI is a web UI for OAI-Compatible APIs
Learning Resources
Featuring Svelte Contributors and Ambassadors
Dockerizing Your SvelteKit Applications: A Practical Guide by Stanislav Khromov
Is Local First the future of web development?, The hidden benefit of upgrading to Svelte 5 - smaller bundle sizes and SvelteKit Streaming Explained: When and How to Use It - Videos by Stanislav Khromov
Svelte 5 - everything about the new APIs with Simon Holthausen at CITYJS CONFERENCE
Learn How To Use Svelte 5 Snippets by Joy of Code
Svelte London - September 2024 feat. maya with "The Joy of Side Projects ✨"
This Week in Svelte
Ep. 74 — Changelog, race and maybeStream, svelte:component obsolete
Ep. 75 — Changelog, $props, $state
Ep. 76 — Changelog, svelte-fsm, script module, trailing slash
Ep. 77 — Changelog, Context API, JSX and Single FIle Components
Ep. 78 — Changelog, Indeterminate checkbox, classes and actions
Svienna 09/2024
How to embrace Zod in your SvelteKit by Sasan Jaghori
Dates an intersection of a romantic story and Dates in JS by Domenik Reitzner
Svelte 5: Why the hell did you do that by Simon Holthausen
To Read
My thoughts on upgrading a ~15,000 LOC project to Svelte 5 by /u/practisingdeeplurk
How to Publish an Unbundled Svelte Package to npm by Matthew Davis
Migrating YouTube Looper to Svelte 5 by Wilker Lucio
Breaking out of Svelte's reactive statements by Zell Liew
Data Visualizations using Svelte and D3 by DataVizSvelte
To Watch
Sveltekit Data Fetching in 2024 Explained by Ben Davis
DB or not DB? and Github issues as CMS? by With Svelte
Crash course on Sveltekit Superforms and Build a Full-stack Ecommerce Platform with Sveltekit, Vendure, Houdinigql, Shadcn-svelte by Lawal Adebola
Libraries, Tools & Components
Tzezar's Datagrid is an easy to use and easy to customize datagrid component
SparklePost is a demo application that implements interface patterns commonly found in native iOS and Android apps, using modern and performant web development techniques
tipex is a customizable rich text editor for SvelteKit; based on TipTap
That's it for this month! Let us know if we missed anything on Reddit or Discord.
Until next time 👋