fix(react): defer useSignal update to a microtask to avoid scheduling during commit

[RobHannay]

Problem

useSignal (used by useComputed → useDragOperation) calls forceUpdate() synchronously from its signal effect. When the observed signal changes while React is mid-commit, that schedules a synchronous React update from within a React lifecycle method.

This happens in an ordinary scenario: a component reads drag state via useDragOperation() and re-renders during a drag (e.g. to show/highlight a drop zone — the use case the docs describe). At drag end, dnd-kit resets the drag operation (DragOperation.reset() clears sourceIdentifier) inside manager.renderer.rendering.then(...), which runs from the React Renderer's layout effect — i.e. during React's commit/effect phase. The useSignal effect then fires forceUpdate() synchronously, producing:

• Warning: useInsertionEffect must not schedule updates.

Minimal repro shape: any component under DragDropProvider that calls useDragOperation() and re-renders based on source/target logs the warning when a drag ends.

(An earlier version of this description also attributed a NotFoundError: removeChild crash to this path; that turned out to be an application-side issue in how we consumed onDragOver — leaving drag-overs unanswered so OptimisticSortingPlugin reordered DOM the app then also reconciled — not a useSignal bug. This PR is scoped to the warning.)

Fix

Defer the useSignal update to a microtask so it runs after the commit completes instead of scheduling synchronously from within the effect. This mirrors the guard already present in useDeepSignal (queueMicrotask(() => flushSync(forceUpdate))).

useDeepSignal only deferred its sync branch; useSignal's async branch — the one useComputed/useDragOperation use (sync=false) — has the same latent issue, so this defers both branches.

Notes

• No API change; updates are just flushed a microtask later (imperceptible — React already batches).
• Nothing in packages/react calls useSignal/useComputed with sync=true, so the sync-branch change has effectively no blast radius.
• Changeset included (@dnd-kit/react patch).

[changeset-bot]

🦋 Changeset detected

Latest commit: 7d61b68

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 10 packages

Name	Type
@dnd-kit/react	Patch
@dnd-kit/abstract	Patch
@dnd-kit/collision	Patch
@dnd-kit/dom	Patch
@dnd-kit/geometry	Patch
@dnd-kit/helpers	Patch
@dnd-kit/state	Patch
@dnd-kit/vue	Patch
@dnd-kit/solid	Patch
@dnd-kit/svelte	Patch

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