import { AsyncSequence } from "../../sequency";
export declare class Flatten {
    /**
     * Returns a single flat sequence of all the items from all sequences or iterables.
     *
     * @returns {AsyncSequence<T>}
     */
    flatten<T>(this: AsyncSequence<AsyncSequence<T> | AsyncIterable<T> | Iterable<T>>): AsyncSequence<T>;
}