The type of the elements in the source sequence.
The type of the result of the aggregation.
An async-iterable sequence to aggregate over.
The options which contains a callback, with optional seedn and an optional abort signal for cancellation.
A promise with the final accumulator value.
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Applies an accumulator function over an async-iterable sequence, returning the result of the aggregation as a single element in the result sequence. The seed value, if specified, is used as the initial accumulator value. For aggregation behavior with incremental intermediate results, scan.