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perf: use Set for rest-prop exclude lists (server, legacy, exclude_from_object)

Status: Open.

#18601 In sveltejs/svelte;

· ljodea opened on Jul 29, 2026

perf: O(k²) key dedup in spread_props ownKeys

Status: Open.

#18600 In sveltejs/svelte;

· ljodea opened on Jul 29, 2026

perf: O(n²) membership in sort_const_tags topological sort

Status: Open.

#18599 In sveltejs/svelte;

· ljodea opened on Jul 29, 2026

Logical assignment operators on $state fields always assign

Status: Open.

#18592 In sveltejs/svelte;

· Nic-Polumeyv opened on Jul 28, 2026

SSR: onDestroy callbacks are skipped when the render throws

Status: Open.

#18584 In sveltejs/svelte;

· Nic-Polumeyv opened on Jul 24, 2026

Deprecate onMount the way beforeUpdate and afterUpdate were

Status: Open.

#18583 In sveltejs/svelte;

· Nic-Polumeyv opened on Jul 24, 2026

<textarea> value handling inconsistencies

Status: Open.

#18574 In sveltejs/svelte;

· brunnerh opened on Jul 22, 2026

last_propagated_event retains the last event's target subtree (detached DOM) until the next delegated event

Status: Open.

#18568 In sveltejs/svelte;

· randalmurphal opened on Jul 21, 2026

Docs: Document the pattern for explicit dependency tracking across asynchronous boundaries

Status: Open.

#18565 In sveltejs/svelte;

· harrmitch opened on Jul 19, 2026

Track pause ownership so outro walks can't undo each other

Status: Open.

#18563 In sveltejs/svelte;

· Nic-Polumeyv opened on Jul 18, 2026

experimental.async: nested dynamic component mounts twice when swapped while a persistent ancestor renders the outgoing subtree's teleported snippet

Status: Open.

#18554 In sveltejs/svelte;

· Nic-Polumeyv opened on Jul 17, 2026

flushSync() inside a render-phase effect can permanently kill the effect tree

awaiting submitterneeds a reproduction, or clarificationneeds a reproduction, or clarification

Status: Open.

#18546 In sveltejs/svelte;

· Deeds67 opened on Jul 14, 2026