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sveltejs
svelte
web development for the rest of us
JavaScript88,169 stars5,925 forks1,093 open issuesMITupdated Sep 22, 2026
Project Brief
web development for the rest of us
Language
JavaScript
Community
88,169 stars
Pulse
Actively developed
Last commit
Sep 22, 2026
Written in JavaScript 71% · Svelte 22% · TypeScript 5% · CSS 1% · HTML 1%.
Contribution Paths
The three busiest routes into sveltejs/svelte, read from the open issue queue. Select one to focus it on the map and in the issue list below.
Relay Map
2 contribution areas drawn from 32 open issues and their labels. Select a node to focus the issue list below.
- Other areas, 31 open issues
- Performance, 1 open issue
Open Issues
32 open
- #18850`schedule_effect` dereferences a null `current_batch` (regression in 5.54.0)by ndriupdated Sep 21, 20262 comments
- #18845SSR: a component `bind:` copies the whole page on every retry, and breaks `<select>`by DmitriiNazimovupdated Sep 21, 20262 comments
- #18840Hydration mismatch recovery is intercepted by svelte:boundaryby teemingcupdated Sep 22, 20262 comments
- #18834Chromium: responsive <img> in an {#if}/snippet-only fragment is retained forever — template-document clone adopted into a page-document comment() fragment and backby rickryan26-Botupdated Sep 16, 20260 comments
- #18827A derived read via untrack() inside an effect leaves its child deriveds connected forever (memory leak: unmounted components pinned through page.data)by rickryan26-Botupdated Sep 16, 20260 comments
- #18824Synchronous throw in an awaited expression becomes `null.f`by jkbz64updated Sep 15, 20260 comments
- #18811`forkPreloads` crashing: a speculative render writes the `UNINITIALIZED` sentinel to the DOMby TristanCopleyupdated Sep 11, 20260 comments
- #18802Hydration mismatch in <svelte:head> can remove unrelated stylesheet via skip_nodes()awaiting submitterby toon-van-berkelupdated Sep 10, 20263 comments
- #18799Async component initialization crashes when current_batch is nullby jkbz64updated Sep 9, 20263 comments
- #18781Memory leak: reconnecting a derived after nested state replacement retains unmounted componentsby kmplngjupdated Sep 6, 20261 comments
- #18780Discussion: Improving hydration performance for large listsperfby fbwe425updated Sep 22, 20260 comments
- #18778Plugin source map still not properly chainedby K1DV5updated Sep 5, 20262 comments
- #18773Out-only deferred transition crashes when its outro is aborted from an $effectby dimensiupdated Sep 4, 20260 comments
- #18761Batch created during flush is never scheduled; `#find_earlier_batch` merges later batches into it and part of the UI permanently stops updatingby fig-ambassadorupdated Sep 3, 20260 comments
- #18716No way for a library to opt a `$state` value out of ownership validationby Stadlyupdated Aug 26, 20262 comments
- #18704Svelte Inspector is incompatible with previous Vite transform pluginby adigubaupdated Aug 25, 20260 comments
- #18681Overridable deriveds: under server codegen an override survives dependency changes forever — the documented lifetime silently differs between the two builds of the same universal moduleby urbiconupdated Aug 28, 20261 comments
- #18679Content under container-type: inline disappears.browser specificby halteshupdated Aug 24, 20262 comments
- #18675experimental.async: invariant_violation "Batch has scheduled roots" — $effect.pending() + {#each await …} with bind:this in a branch created after initial renderby Tyler-Petrovupdated Aug 19, 20260 comments
- #18662Async derived Promise.all over remote-query-like thenables loops foreverby kenkunzupdated Aug 18, 20262 comments
- #18660Expose `RenderOutput` from `svelte/server`by Rich-Harrisupdated Aug 31, 20261 comments
- #18649Uncommitted fork() should not affect $effect.pending()by adigubaupdated Aug 20, 20264 comments
- #18643esrap 2.3.3: server codegen emits invalid JS when `@type` JSDoc on `export let` meets a `$:` declarationby Ivaneykoupdated Aug 16, 20262 comments
- #18639using $effect disables animate:flipawaiting submitterby pebbeupdated Aug 14, 20262 comments
- #18624Browser lockup when using reactive remote function with LayerChartby techniqupdated Aug 20, 20261 comments
- #18623Memory leak in 5.55.6 version, detached DOM subtrees retained after destroyby 4eb0daupdated Aug 10, 20261 comments
- #18601perf: use Set for rest-prop exclude lists (server, legacy, exclude_from_object)by ljodeaupdated Aug 16, 20261 comments
- #18583Deprecate `onMount` the way `beforeUpdate` and `afterUpdate` wereby Nic-Polumeyvupdated Sep 3, 202619 comments
- #18565Docs: Document the pattern for explicit dependency tracking across asynchronous boundariesby harrmitchupdated Jul 19, 20260 comments
- #18563Track pause ownership so outro walks can't undo each otherby Nic-Polumeyvupdated Jul 18, 20260 comments
- #18554experimental.async: nested dynamic component mounts twice when swapped while a persistent ancestor renders the outgoing subtree's teleported snippetby Nic-Polumeyvupdated Jul 17, 20262 comments
- #18546`flushSync()` inside a render-phase effect can permanently kill the effect treeawaiting submitterby Deeds67updated Jul 18, 20263 comments
Activity
Latest commit Sep 22, 2026 · the project is actively developed
- fix: avoid reinserting dynamic elements during hydration (#18855)803f59b · Kunpeng Xie · Sep 22, 2026
- Version Packages (#18750)636eaaa · github-actions[bot] · Sep 18, 2026
- fix: remove incorrect special handling of :export pseudo-selectors (#18839)8030ff2 · Rich Harris · Sep 18, 2026
- fix: make Object.hasOwn reactive for state proxies (#18838)a72dc8e · svelte-triage-bot[bot] · Sep 18, 2026
- chore: scope.js stops importing from the analysis visitors (#18787)
Readme
What is Svelte?
Svelte is a new way to build web applications. It's a compiler that takes your declarative components and converts them into efficient JavaScript that surgically updates the DOM.
Learn more at the Svelte website, or stop by the Discord chatroom.
Supporting Svelte
Svelte is an MIT-licensed open source project with its ongoing development made possible entirely by fantastic volunteers. If you'd like to support their efforts, please consider:
Funds donated via Open Collective will be used for compensating expenses related to Svelte's development such as hosting costs. If sufficient donations are received, funds may also be used to support Svelte's development more directly.
Roadmap
You may view our roadmap if you'd like to see what we're currently working on.
Contributing
Please see the Contributing Guide and the svelte package for information on contributing to Svelte.
Is svelte.dev down?
Probably not, but it's possible. If you can't seem to access any .dev sites, check out this SuperUser question and answer.