liveblocks

v3.19.4 Breaking

This release includes breaking changes for platform teams planning a safe upgrade.

Published 1d Developer Productivity

✓ No known CVEs patched

✓ No known CVEs patched in this version

Topics

ai-agents ai-copilot collaboration commenting-system comments crdt

+10 more

liveblocks multiplayer notifications-systems presence react real-time toolkit websockets yjs yjs-provider

Summary

AI summary

Fixed concurrent push ordering, offline delete reappearances, extraneous reconnect updates, and missing deletedItem in LiveObject notifications.

Type	Severity	Summary	CVE
Bugfix
Bugfix	Medium	Fixes out-of-order settlement of concurrent LiveList.push() calls. Fixes out-of-order settlement of concurrent LiveList.push() calls. Source: llm_adapter@2026-06-02 Confidence: high	—
Bugfix	Medium	Prevents reappearing deleted LiveObject keys after client reconnects offline. Prevents reappearing deleted LiveObject keys after client reconnects offline. Source: llm_adapter@2026-06-02 Confidence: high	—
Bugfix	Medium	Reduces excessive update notifications for unchanged LiveObject keys on reconnect. Reduces excessive update notifications for unchanged LiveObject keys on reconnect. Source: llm_adapter@2026-06-02 Confidence: high	—
Bugfix	Medium	Includes removed value (`deletedItem`) in change notification when deleting a nested live value from a LiveObject. Includes removed value (`deletedItem`) in change notification when deleting a nested live value from a LiveObject. Source: llm_adapter@2026-06-02 Confidence: high	—

Full changelog

Fix LiveList.push() so concurrent pushes from multiple clients no longer settle out of order.
Fix a bug where a LiveObject key deleted while a client was offline would reappear on reconnect, preventing the two clients from reconverging.
Fix a bug where reconnecting would emit too many update notifications for LiveObject keys whose values had not actually changed.
Fix a bug where deleting a nested live value from a LiveObject omitted the removed value (deletedItem) from the change notification.

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Realtime infrastructure for multiplayer apps and agents