Function afterEventBy

afterEventBy<TEvent>(register, fallback?, cleanup?): AfterEvent<TEvent>
Converts a plain event receiver registration function to AfterEvent keeper with a fallback.

The event constructed by fallback will be sent to the registered first receiver, unless register function sends one.
Type Parameters
- TEvent extends any[]
  
  An event type. This is a list of event receiver parameter types.
Parameters
- register: ((this, receiver) => void)
  
  Generic event receiver registration function. It will be called on each receiver registration, unless the receiver's event supply is cut off already.
  - - (this, receiver): void
    - Parameters
      
      this: void
      
      receiver: Generic<TEvent>
      
      Returns void
- fallback: ((this) => TEvent) = AfterEvent$noFallback
  
  A function creating fallback event. When omitted, the initial event is expected to be sent by register function. A receiver registration would lead to an error otherwise.
  - - (this): TEvent
    - Parameters
      
      this: void
      
      Returns TEvent
- cleanup: ((this, reason?) => void) = AfterEvent$noCleanup
  
  A function that will be called once all registered event supplies cut off.
  - - (this, reason?): void
    - Parameters
      
      this: void
      
      Optional reason: unknown
      
      Returns void
Returns AfterEvent<TEvent>
An AfterEvent keeper registering event receivers with the given register function.
- Defined in proc7ts/fun-events/src/after-event.ts:56

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