I’ve spent 3+ years fighting the same problems while building DocNode and DocSync, two libraries that do exactly what you describe.

DocSync is a client-server library that synchronizes documents of any type (Yjs, Loro, Automerge, DocNode) while guaranteeing that all clients apply operations in the same order. It’s a lot more than 40 lines because it handles many things beyond what’s described here. For example:

It’s local-first, which means you have to handle race conditions.

Multi-tab synchronization works via BroadcastChannel even offline, which is another source of race conditions that needs to be controlled.

DocNode is an alternative to Yjs, but with all the simplicity that comes from assuming a central server. No tombstones, no metadata, no vector clock diffing, supports move operations, etc.

I think you might find them interesting. Take a look at https://docukit.dev and let me know what you think.