Extending Reactivity to the Server for Local-First Application Development

The Shift in Web Development Focus

The evolution of web development has consistently aimed at creating faster and more efficient applications. While client-side reactivity frameworks have optimized reactivity loops, the presentation suggests that further significant gains are becoming harder to find within this domain alone.

Beyond Client-Side Reactivity

The argument is made that the next frontier for innovation in application development is to extend reactivity to the server. This contrasts with the conventional method of building applications based on data fetching, which often introduces complexities related to network interactions and latency.

The Sync Engine Architecture Model

Under this proposed model, a user's local write instantly updates the client's UI with optimistic state, providing immediate feedback. This change then synchronizes with the server in the background. Subsequently, any relevant changes from the database, whether from the user or others, sync back to the client, updating the store and rendering the final state.

Benefits of Server-Extended Reactivity

This approach aims to abstract away the network, offering substantial performance improvements and a more seamless user experience. By integrating client-side and client-server reactivity, applications can achieve instant UI updates and efficient data consistency across multiple clients.