What the handler does with the result (PayloadTracer effects).
OptionaloperatorsOperators in the chain's pipe(...) whose callback receives the result (filter(r => ...)), with their effects.
OptionalparameterFirst parameter of the receiver, or the variable an awaited or stored result lands in; absent when there is none.
OptionalresultThe result is never read: receiver without parameter, subscribe()
without one, or no effects, and no operator reads it; or a stored result
is never read.
OptionalviaSteps between the creation and the handler: switchMap, firstValueFrom, await.
What receives a creation result, and what it does with it.