export declare class DomHelper {
    private static readonly _interactiveSelector;
    /**
     * First interactive descendant of `root`, or `null`. Use to reject interactive content from a
     * container that must stay non-interactive (a `<button>` trigger, a `<label>`).
     */
    static findInteractiveDescendant(root: Element): HTMLElement | null;
    /**
     * True when the target is, or sits inside, interactive content — i.e. something that owns its own
     * click behaviour and whose default action a wrapper must not cancel.
     */
    static isInsideInteractive(target: EventTarget | null): boolean;
    /**
     * Checks whether initial object is located inside specified boundaries
     * @param  {HTMLElement} element The initial element
     * @param  {HTMLElement[]} boundaryElements Parent elements concerned to be valid boundaries
     * @return {boolean} true if initial element is located inside specified boundaries, otherwise false
     */
    static checkElementOutsideSpecifiedBoundaries(element: Element | EventTarget | null, boundaryElements: Array<Element | EventTarget>): boolean;
    static calcHeightBasedOnRows(element: HTMLElement, rows: number): string;
}