import { AsyncSequence } from "../../sequency";
export declare class Count {
    /**
     * Returns the number of elements of this sequence. If `predicate` is present, returns
     * the number of elements matching the given `predicate`.
     *
     * @param {(T) => Promise<boolean> | boolean} predicate
     * @returns {Promise<number>}
     */
    count<T>(this: AsyncSequence<T>, predicate?: (item: T) => Promise<boolean> | boolean): Promise<number>;
}