/**
 * @author Thomas Barnekow
 * @license MIT
 */
import { IterableValueTransform } from '@tsdotnet/linq/dist/IterableTransform.js';
import { XContainer, XElement, XName } from '../internal.js';
/**
 * Returns a function that, for the elements of the source sequence passed to
 * that function, returns the concatenated sequences of descendants of such
 * elements in document order.
 *
 * If a name is provided, the resulting sequence contains only those ancestors
 * having a matching name.
 *
 * @typeParam T The type of the elements contained in the source sequence.
 * @param name The optional name used to filter the sequence of descendants.
 * @returns A function that will return a flat sequence of descendants in
 * document order.
 */
export declare function descendants<T extends XContainer>(name?: XName | null): IterableValueTransform<T, XElement>;
/**
 * Returns a function that, for the elements of the source sequence passed to
 * that function, returns the concatenated sequences of descendants of such
 * elements, including the elements themselves, in document order.
 *
 * If a name is provided, the resulting sequence contains only those elements
 * and descendants having a matching name.
 *
 * @param name The optional name used to filter the sequence of descendants
 * and elements.
 * @returns A function that will return a flat sequence of ancestors, including
 * the elements, in document order.
 */
export declare function descendantsAndSelf(name?: XName | null): IterableValueTransform<XElement, XElement>;