1type State = 'Unknown' | 'Idle' | 'Running' | 'Interrupted'
2type Event = 'SetIdle' | 'SetRunning' | 'SetInterrupted'
3// The local twin of a machine
4const MachineFish = (name: string): Fish<State, Event> => ({
5  // Unique ID
6  fishId: FishId.of('machineFish', name, 0),
7  // Where we start
8  initialState: 'Unknown',
9  // Event subscriptions
10  where: Tag<Event>('machine').withId(name),
11  // Business logic (event reducer)
12  onEvent: (state, event) => {
13    switch (event) {
14      case 'SetIdle': return 'Idle'
15      case 'SetRunning': return 'Running'
16      case 'SetInterrupted': return 'Interrupted'
17      default: break
18    }
19    return state
20  },
21})