/**
 * Get the index of the node at a client position, or `-1`.
 */
export declare function hitTestNodes(nodes: HTMLElement[] | NodeList, x: number, y: number): number;
/**
 * Find the first element matching a class name.
 */
export declare function findElement(parent: HTMLElement, className: string): HTMLElement;
/**
 * Vertically scroll an element into view if needed.
 *
 * @param area - The scroll area element.
 *
 * @param elem - The element of interest.
 *
 * #### Notes
 * This follows the "nearest" behavior of the native `scrollIntoView`
 * method, which is not supported by all browsers.
 * https://drafts.csswg.org/cssom-view/#element-scrolling-members
 *
 * If the element fully covers the visible area or is fully contained
 * within the visible area, no scrolling will take place. Otherwise,
 * the nearest edges of the area and element are aligned.
 *
 * #### License
 * This function is from the PhosphorJS project and has the following license.
 *
 * Copyright (c) 2014-2016, PhosphorJS Contributors
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * Copyright (c) 2014-2016, PhosphorJS Contributors
 *
 * See here for details:
 * https://github.com/phosphorjs/phosphor/blob/282a8ba6d542ce27ac583a3029f0dbd52d17228f/src/dom/query.ts#L95
 *
 * #### TODO
 * Switch this for importing phosphor's version when the monorepo is used.
 */
export declare function scrollIntoViewIfNeeded(area: HTMLElement, elem: HTMLElement): void;