Type Alias Subscriptions<State, Message, R, K>

Subscriptions: (state: State) => HashMap.HashMap<K, Subscription<Message, R>>

What a program listens to in a state, by key: the engine starts and stops subscriptions as keys come and go.

- (state: State): HashMap.HashMap<K, Subscription<Message, R>>
- Parameters
  - state: State
  Returns HashMap.HashMap<K, Subscription<Message, R>>