Accumulates value, starting with
v0 and applying
f to each emitted item.
If no items are emitted the promise is rejected.
Type of result returned from the accumulator.
Type of items emitted by the observable.
Observable to reduce.
Reduce function called with the accumulated value so far and the current item. Should return a new accumulated value.
Initial accumulator value.
Promise that resolves with the accumulated value.
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