The Complexity of Concurrent Editing
Building real-time collaborative systems like Figma or Google Docs requires solving conflict resolution across multiple distributed nodes. Traditional Operational Transformation (OT) requires a centralized server to sequence operations, creating bottlenecks.
"Conflict-Free Replicated Data Types (CRDTs) allow distributed clients to edit documents concurrently offline and converge mathematically to the identical state once connected."
Core Components
- Yjs & Automerge: High-performance CRDT libraries implemented in JavaScript and Rust that handle text diffing, tree synchronization, and undo/redo stacks.
- WebSocket Ephemeral Awareness: Broadcasting cursor positions, user presence, and live selections over low-latency binary WebSocket streams.
- Local-First Persistence: Storing document states in browser IndexedDB for instant offline loading and background sync.