Type alias ProjectorReducer<S, E, K>

ProjectorReducer<S, E, K>: ((event, map) => Promise<ProjectionPatch<S>[]>)

Type Parameters

S extends State
E extends Messages
K extends keyof E

Type declaration

- (event, map): Promise<ProjectionPatch<S>[]>
- Projector reducers apply events as "state patches" to the resulting projection map
  - event the committed event being projected
  - map a reference to the resulting projection map
  Parameters
  - event: CommittedEvent<Pick<E, K>>
  - map: ProjectionMap<S>
  Returns Promise<ProjectionPatch<S>[]>

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