• 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.

    Type Parameters

    • T

      The type of elements in the source collection.

    Parameters

    • source: AsyncIterable<T>

      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.

    Returns Promise<number>

    The number of matching elements for the given condition if provided, otherwise the number of elements in the sequence.

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