Yjs 14 CRDT Patterns

Reference Repositories

• Yjs: CRDT framework for shared editing and offline-first data
• Yjs Protocols: algorithmic grounding for sync and awareness

Upstream Grounding

When conflict semantics, transaction origins, shared-type behavior, update encoding, storage growth, or shared-type APIs affect correctness, use source-backed grounding before relying on memory. If DeepWiki MCP is available, ask a narrow question against yjs/yjs; for sync and awareness algorithms, ask against yjs/y-protocols. If DeepWiki is unavailable or the repo is not indexed, use upstream source or official docs directly. Treat DeepWiki as orientation, then verify decisive details against the locally pinned @y/y types and source before changing code.

Epicenter targets @y/y 14 only. Do not add yjs 13, y-indexeddb, a compatibility reader, a package alias, a dual wire, or a fallback. Existing Yjs 13 code is replacement material, not a compatibility surface.

Skip DeepWiki for stable basics and repo-local patterns already documented below.

Related Skills: See workspace-api for the workspace abstraction built on Yjs.

Transactions, Origins, And Undo