import { SyntheticEvent } from 'react';
/**
 * Is this element visible and not within a hidden sub-tree (e.g. hidden tab)?
 * Based on the underlying css 'display' property of all ancestor properties.
 */
export declare function isDisplayed(elem: HTMLElement): boolean;
/**
 * Observe when a dom node's size changes.
 *
 * @param fn - function to be called with the co-ordinates of the node.
 * @param node - The DOM node to observe
 * @param opts - extra options, currently supporting a `debounce` specified in ms.
 * @returns ResizeObserver used to implement this function. Be sure to call disconnect()
 *      on this when finished.
 *
 * Unlike the raw ResizeObserver implementation, this function will not run the
 * callback when the dimensions are both changed to 0 or is changed back from 0
 * to a previous size.  This is to improve performance by avoiding responding to
 * visibility changes.
 *
 * For a hook that conveniently wraps this function see {@link useOnResize}.
 */
export declare function observeResize(fn: (size: DOMRect) => any, node: Element, opts?: {
    debounce?: number;
}): ResizeObserver;
/**
 * Observe when a dom node's visibility changes.
 *
 * @param fn - function that takes a single argument with visibility.
 * @param node - The DOM node to observe
 * @returns ResizeObserver used to implement this function. Be sure to call disconnect() on this
 *      when finished.
 *
 * For a hook that conveniently wraps this function see {@link useOnVisibleChange}.
 */
export declare function observeVisibleChange(fn: (visible: boolean) => any, node: Element): ResizeObserver;
/**
 * Determines whether an element has an ancestor with a specific class name
 */
export declare function elemWithin(target: HTMLElement, className: string): boolean;
/**
 * A convenience handler that will call 'stopPropagation'
 * and 'preventDefault' on an event.
 */
export declare function consumeEvent(e: Event | SyntheticEvent): void;
/**
 * A convenience handler that will 'stopPropagation' on an event.
 */
export declare function stopPropagation(e: Event | SyntheticEvent): void;