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sveltejs
svelte
web development for the rest of us
JavaScript87,913 stars5,179 forks1,122 open issuesMITupdated Aug 6, 2026
Project Brief
web development for the rest of us
Language
JavaScript
Community
87,913 stars
Pulse
Actively developed
Last commit
Jul 24, 2026
Written in JavaScript 71% · Svelte 22% · TypeScript 5% · CSS 1% · HTML 1%.
Contribution Paths
No contribution paths to rank yet.
Paths are ranked from labeled open issues. When sveltejs/svelte has more structured issue data, the busiest routes will appear here.
Relay Map
Not enough public issue data to build a meaningful contribution map.
sveltejs/svelte has few or no labeled open issues right now, so there is nothing structurally sound to draw. The issue list below and the repository on GitHub stay the most reliable routes in.
Open Issues
32 open
- #18615SSR: reactive values inside labeled statements are not transformedby baseballyamaupdated Aug 5, 20260 comments
- #18612Async blocker analysis does not see through a factory function in a function bindingby Stadlyupdated Aug 5, 20260 comments
- #18610Async mode: controlled {#each} throws "Cannot read properties of undefined (reading 'e')" when emptied while another batch is pendingby nmontavonupdated Aug 4, 20260 comments
- #18609CSS parser rejects minified `:nth-child` `of` syntax (`2n of.foo`) — REGEX_NTH_OF requires whitespace on both sides of `of`by stephperkupdated Aug 4, 20260 comments
- #18608set_attributes nulls its own $$-prefixed listener bookkeeping, leaking a listener per toggle for spread on* handlers that go function -> undefinedby maarten-nemupdated Aug 3, 20260 comments
- #18607Comments break server-side compilerby mhkellerupdated Aug 2, 20261 comments
- #18601perf: use Set for rest-prop exclude lists (server, legacy, exclude_from_object)by ljodeaupdated Jul 29, 20260 comments
- #18600perf: O(k²) key dedup in spread_props ownKeysby ljodeaupdated Jul 29, 20260 comments
- #18599perf: O(n²) membership in sort_const_tags topological sortby ljodeaupdated Jul 29, 20260 comments
- #18592Logical assignment operators on $state fields always assignby Nic-Polumeyvupdated Jul 28, 20260 comments
- #18584SSR: `onDestroy` callbacks are skipped when the render throwsby Nic-Polumeyvupdated Jul 24, 20260 comments
- #18583Deprecate `onMount` the way `beforeUpdate` and `afterUpdate` wereby Nic-Polumeyvupdated Aug 1, 202616 comments
- #18574`<textarea>` value handling inconsistenciesby brunnerhupdated Jul 23, 20266 comments
- #18568`last_propagated_event` retains the last event's target subtree (detached DOM) until the next delegated eventby randalmurphalupdated Jul 21, 20260 comments
- #18565Docs: Document the pattern for explicit dependency tracking across asynchronous boundariesby harrmitchupdated Jul 19, 20260 comments
- #18563Track pause ownership so outro walks can't undo each otherby Nic-Polumeyvupdated Jul 18, 20260 comments
- #18554experimental.async: nested dynamic component mounts twice when swapped while a persistent ancestor renders the outgoing subtree's teleported snippetby Nic-Polumeyvupdated Jul 17, 20262 comments
- #18546`flushSync()` inside a render-phase effect can permanently kill the effect treeawaiting submitterby Deeds67updated Jul 18, 20263 comments
- #18531`SvelteMap.set` on an existing key notifies `keys()` readers even though the key set didn't changeby Nic-Polumeyvupdated Jul 10, 20260 comments
- #18524experimental.async: batch merging permanently swallows unrelated synchronous UI updates when an earlier async batch never settlesby reinhard-sanzupdated Jul 17, 20261 comments
- #18522`flushSync()` errors when called at top level of script; doesn't work with `$effect.pre`by jacekalmsupdated Jul 10, 20260 comments
- #18503$derived re-executes once per reading effect (memoization lost) when invalidated while another batch is pending (experimental.async)by billpeetupdated Jul 4, 20260 comments
- #18489$derived on a class instance returns a stale value after the effect that incidentally owned it at construction is destroyedby reinhard-sanzupdated Jul 7, 20261 comments
- #18485Error thrown by a $derived re-executing during teardown escapes <svelte:boundary> (and can mask the real error via null effect.b)by Stadlyupdated Jun 29, 20260 comments
- #18471Provide hasContext function with createContextby soleuniverse101updated Jul 12, 20264 comments
- #18469`TypeError: value is not a function` on SSR when nested `{#snippet}` reads `{const x = $derived(await …)}` from parent snippet body via a sync `$derived`by hanszoonsupdated Jul 10, 20262 comments
- #18468When committing a fork derived seem to be read out of order in some cases.awaiting submitterby jjones315updated Jul 17, 20262 comments
- #18465Function call in class: and style: directives are inconsistent with standard attributesby adigubaupdated Jun 25, 20260 comments
- #18462Docs: "Component testing" of "Context" article editsby svewupdated Jun 23, 20260 comments
- #18460docs: move declaration tags from template syntax to basic markupby sacrosancticupdated Jun 28, 20262 comments
- #18451TypeScript error thrown when exported snippets reference a type of a script elementby WarningImHack3rupdated Jun 22, 20265 comments
- #18447Add `defaultValue` to `<select>`by ottomatedupdated Jun 20, 20260 comments
Activity
Latest commit Jul 24, 2026 · the project is actively developed
- Version Packages (#18572)44a7813 · github-actions[bot] · Jul 24, 2026
- chore: Supply chain hardening (#18253)23bc246 · Elliott Johnson · Jul 24, 2026
- fix: call `onerror` and provide a working `reset` when hydrating a failed boundary (#18…3dde011 · Nic Polumeyv · Jul 23, 2026
- fix: preserve select selection with spread attributes (#18561)2bace30 · Floze · Jul 22, 2026
- Version Packages (#18560)b29d700 · github-actions[bot] · Jul 20, 2026
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.