feat(core): add sharedSignal for cross-tab state sync#4
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February 11, 2026 17:12
Add sharedSignal(key, initialValue) — a reactive signal that automatically syncs its value across browser tabs via BroadcastChannel. - Broadcasts local .set()/.update() calls to other tabs - Receives remote updates and applies them reactively - Prevents echo loops (remote updates don't re-broadcast) - Supports custom serialize/deserialize for non-JSON types - Falls back to a plain signal when BroadcastChannel is unavailable - close() tears down the channel - 10 new tests including multi-tab, bidirectional, and SSR fallback
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Summary
sharedSignal(key, initial)— a signal that syncs across browser tabs via BroadcastChannel.set()/.update()to broadcast changes, with echo-loop preventionclose()for cleanupTest plan