# What's new in Svelte: December 2024

DevFeed: [What's new in Svelte: December 2024](<https://devfeed.tech/articles/what-s-new-in-svelte-december-2024-3072.md>)

Original publisher: [Read original article](<https://svelte.dev/blog/whats-new-in-svelte-december-2024>)

Author: Dani Sandoval

Published: 2024-12-01T00:00:00Z

Content type: article

Language: en

Sources: [Svelte blog](<https://devfeed.tech/sources/svelte-blog.md>)

Topics: [Svelte](<https://devfeed.tech/topics/svelte.md>), [changelog](<https://devfeed.tech/topics/changelog.md>), [Command-line interface](<https://devfeed.tech/topics/cli.md>), [debug](<https://devfeed.tech/topics/debug.md>), [Web](<https://devfeed.tech/topics/web.md>)

Tags: [bug](<https://devfeed.tech/tags/bug.md>), [bug-fixes](<https://devfeed.tech/tags/bug-fixes.md>), [changelog](<https://devfeed.tech/tags/changelog.md>), [cli](<https://devfeed.tech/tags/cli.md>), [code](<https://devfeed.tech/tags/code.md>), [community](<https://devfeed.tech/tags/community.md>), [debugging](<https://devfeed.tech/tags/debugging.md>), [features](<https://devfeed.tech/tags/features.md>), [release](<https://devfeed.tech/tags/release.md>), [svelte](<https://devfeed.tech/tags/svelte.md>), [web](<https://devfeed.tech/tags/web.md>)

## AI overview

A December 2024 Svelte community newsletter covering Svelte 5 bug-fix releases, recent SvelteKit, Svelte CLI, and language-tool updates, and a showcase of community-built applications and websites.

## Source excerpt

I can't believe it's already the last newsletter of the year! So much has happened in the Svelte community - from two great Svelte Summits to the release Svelte 5 🎉 As we look forward to the next year and watch the Svelte team do 24 features in 24 days, let's dive into what's new in the past month... What's new in Svelte The bugfix versions in 5.1.x and 5.2.x addressed a bunch of issues reported by the community. So if you're noticing anything weird, make sure you upgrade to the latest version and, as always, check out the CHANGELOG for all the bug fixes. The features since last month can be found below: ContentVisibilityAutoStateChangeEvent has been added to element definitions (5.2.5, MDN Docs, #14373) What's new in SvelteKit, Svelte CLI and Language Tools isActionFailure is a new helper method to check if a variable is an instanceof ActionFailure - helpful for debugging parsing of user input (2.8.0, #12878) const load = ... declarations will now be typed automatically (svelte2tsx-0.7.23, #2540) The CLI will now include a jsconfig.json in the 'no type checking' template (0.6.2, #290) When installing dependencies, the CLI will display the package manager's output (0.6.3, #305) A short description will now be shown for each add-on in the CLI menu (0.6.5, #299) Instance types will now be provided automatically in Svelte 5 (svelte2tsx-0.7.23, #2553) A code lens indicator for "runes mode" will now appear atop a file when detected - "legacy mode" when not (language-server-0.17.4, #2554) Community ShowcaseApps & Sites built with Svelte Unsubscribe is an interactive site that makes fun of how hard it is to unsubscribe from things on the internet these days Dealcrane helps technology shoppers find discounts across popular internet shopping sites Raw Web is a search engine for indexing the content of independent, especially personal, websites Jovian Moon's personal site features an interactive rocket ship to fly you straight to Jupiter (or anywhere else you want to go) Font