Developer Creates Plexus Framework to Bridge TypeScript Classes with Yjs CRDT

A developer created the Plexus framework to integrate collaborative editing capabilities into an existing large TypeScript object model without rewriting it. The existing model, used across millions of lines of code, was built with classes and MobX for reactivity but needed to become collaborative and local-first. Instead of replacing the model with Yjs's native data structures like Y.Map, Plexus allows developers to keep their original class-based mental model. The framework essentially acts as an adapter layer, letting application code interact with familiar classes while Plexus handles synchronization with the underlying Yjs CRDT engine.