The type of elements in the source collection.
An async-iterable sequence that contains elements to be counted.
Optional
options: OptionalFindOptions<T>The options for a predicate for filtering, thisArg for binding and AbortSignal for cancellation.
The number of matching elements for the given condition if provided, otherwise the number of elements in the sequence.
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Returns a promise that represents how many elements in the specified async-iterable sequence satisfy a condition otherwise, the number of items in the sequence.