ChronoStack
A deterministic event-driven runtime that records state transitions as immutable events, enabling replayable execution and time-travel debugging for modern web systems.
ChronoStack is an experimental deterministic runtime designed to explore replayable execution and state reconstruction in modern web applications.
Modern systems are increasingly asynchronous and event-driven. A single user action can trigger multiple layers of operations such as API calls, background tasks, database mutations, and real-time updates. When issues arise, execution order becomes unclear and reproducing bugs becomes difficult.
ChronoStack approaches this problem at the runtime level.
Instead of mutating state directly, every action is recorded as an immutable event stored in an append-only log. Application state is derived from the event history. Given the same sequence of events, the system deterministically reconstructs the same state.
The current prototype includes:
Persistent event storage (JSON-backed)
Reducer-based deterministic state engine
Versioned state tracking
Replay engine for full state reconstruction
The project will evolve throughout March to include execution metadata, causality tracking, and a visual debugging interface.
ChronoStack aims to improve reproducibility, transparency, and developer observability in modern asynchronous systems.