state syncexpertReddit r/ExperiencedDevs thread with 400+ upvotesMAX
Undo/Redo Stack Divergence in Multiplayer Editing : Merge Correctness Under Concurrent Mutation
TypeScriptYjsMonaco EditorWebSockets
Problem Breakdown
The root defect is that mutation is allowed concurrently from multiple writers while correctness is deferred to a merge step that was never designed with domain semantics in mind. Collaborative editors implement undo as a per-user operation stack, but undo of operation N must transform against all concurrent operations…
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