export declare const isDomRectEqual: (a: DOMRect, b: DOMRect) => boolean;
/**
 * Observes the bounding client box rectangle of the given element for changes.
 *
 * This solution only works for 2 scenarios, though could be updated to support more
 * (e.g. via polling).
 *
 * MutationObserver will only pick up changes to bounds if they are specified via fixed
 * style rules in the element's attribtues.
 *
 * ResizeObserver will pick up all changes to an element's width and height but will not capture
 * any changes to position.
 *
 * @param element The element to observe the bounding box for (i.e. position, width, height)
 * @param onChange Called every time the bounding box changes.
 * @returns Function which disposes the observers when invoked.
 * @ignore
 */
export declare const observeBounds: (element: Element, onChange: (bounds: DOMRect) => Promise<void> | void) => (() => void);