Type alias CommandHandler<S, C, E, K>

CommandHandler<S, C, E, K>: ((data, state, actor?) => Promise<Message<E>[]>)

Type Parameters

S extends State
C extends Messages
E extends Messages
K extends keyof C

Type declaration

- (data, state, actor?): Promise<Message<E>[]>
- Command handlers handle commands and emit events
  - data the command's payload
  - state the state of the artifact handling this command - Empty for systems
  - actor? the actor invoking the command
  Parameters
  - data: Readonly<C[K]>
  - state: Readonly<S>
  - Optional actor: Actor
  Returns Promise<Message<E>[]>

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