// Hooks r04

Transition logging

Tap every transition with a single line. Useful in dev, essential in production for replaying user sessions.

Code

log.ts

machine.hook_any_transition(({ from, to, action }) => {
  log.push({ t: Date.now(), from, to, action });
});

// later: replay by walking log and calling .go(name) in order

Notes

Because the graph rejects illegal moves, replaying a captured log either succeeds end-to-end or fails at the exact point your code drifted. Bisecting state-machine bugs becomes a mechanical exercise.