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Title: fix(react-db): add getServerSnapshot to useSyncExternalStore for React 19 SSR #1534

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Title: fix(react-db): add getServerSnapshot to useSyncExternalStore for React 19 SSR #1534

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6 changes: 6 additions & 0 deletions packages/react-db/src/useLiveQuery.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,11 @@ import type {

const DEFAULT_GC_TIME_MS = 1 // Live queries created by useLiveQuery are cleaned up immediately (0 disables GC)

// Module-level constant so React 19 receives a stable object reference for the
// server snapshot. Creating this inside the hook would produce a new reference
// on every render, causing an infinite loop during SSR/hydration.
const SERVER_SNAPSHOT = { collection: null, version: 0 } as const

export type UseLiveQueryStatus = CollectionStatus | `disabled`

/**
Expand Down Expand Up @@ -483,6 +488,7 @@ export function useLiveQuery(
const snapshot = useSyncExternalStore(
subscribeRef.current,
getSnapshotRef.current,
() => SERVER_SNAPSHOT,
)

// Track last snapshot (from useSyncExternalStore) and the returned value separately
Expand Down