/**
 * A function that observes an HTMLElement and triggers a callback when new elements are added to it.
 * Does NOT trigger for Angular components or logic, only for neutral HTML elements.
 *
 * @param content - The HTMLElement to watch for element additions
 * @param callbackFn - The callback function to call when a change occurs. Will be called with the closest parent element of all added elements.
 */
export declare const observeElement: (content: HTMLElement, callbackFn: (parentElement: HTMLElement) => void) => MutationObserver;