event-sourcing

What problem does it solve?

Event sourcing models state as a sequence of immutable events rather than mutable state, enabling a complete audit trail and deterministic replay for debugging and recovery.

Core Features & Use Cases

• Immutable state with an action log as the source of truth
• Validation separation from reducers to keep state transitions pure
• Snapshotting and replay mechanisms for scalable long-running systems
• Typified actions and events (discriminated unions) for strong typing in TypeScript
• Applicable to game engines, workflows, and any domain needing auditability and replay

Quick Start

Create an initial state, define a typed action log, and replay a sequence of actions to produce the final state.