LiveStore

LiveStore is a TypeScript library that provides a unique approach to building data-intensive, local-first applications for the web and mobile (Expo). It combines the architectural benefits of Event Sourcing with the power and familiarity of SQLite, enhanced by a signals-based reactivity system.

• Event-Driven: Instead of direct state mutation, all changes are captured as immutable, ordered events. This event log forms the definitive history of state transitions and is the single source of truth. This enables undo/redo functionality, auditability, and easier schema migrations.
• Pluggable Synchronization: The event log is the unit of synchronization between clients and the backend. The log is synchronized using a push/pull mechanism with client-side rebasing (similar to Git). LiveStore is agnostic to what syncing provider you use and can work with any backend as long as it can persist an event log.
• Reactive SQLite: LiveStore processes the event log to materialize the application’s state into a local and reactive SQLite database. This database runs in-memory to allow for instant and synchronous queries directly within your components without isLoading states. The database is also persisted in the browser and can be used even when offline.
• Developer Tools: Includes powerful Devtools for inspecting the real-time state database, browsing the event log, analyzing query performance, visualizing the reactivity graph, monitoring sync status, and executing direct SQLite queries. (Note: Devtools access may be sponsor-only post-launch)
• Open Source & Independent: Available under an open source license and developed independently, focusing on sustainable development aligned with user needs.

Resources

• Website
• Documentation
• GitHub
• Examples
• Discord