/**
 * Read a string-valued property from an element, with framework compatibility.
 * Prefers the DOM property (set by Angular/React bindings), and falls back to
 * the attribute when the property is unset.
 */
export declare const readStringProp: <T extends HTMLElement>(el: T, prop: string) => string | undefined;
/**
 * Given a light-DOM child that is assigned to a Shadow DOM <slot> of `host`,
 * find the top-level wrapper element that is directly slotted into `host`.
 * Falls back to climbing parents until reaching `host`.
 */
export declare const findTopLevelSlottedWrapper: (child: HTMLElement, host: HTMLElement, slot?: HTMLSlotElement | null) => HTMLElement;
/**
 * Compare two nodes by their position in the document for stable ordering.
 */
export declare const compareDomOrder: (a: Node, b: Node) => number;
export declare const addScrollToRect: (rect: DOMRect) => DOMRect;
export declare const getElementScrollBoundingClientRect: (element?: HTMLElement | null) => DOMRect | null;
/**
 * Ensures that `rel="noopener noreferrer"` is included when `target="_blank"` is set.
 * noopener prevents the new page from accessing `window.opener`; noreferrer omits the Referer header.
 *
 * @param target - The target attribute value (e.g., "_blank")
 * @param rel - The existing rel attribute value (if any)
 * @returns The rel attribute value with "noopener" and "noreferrer" when target="_blank"
 */
export declare const getSecureRelAttribute: (target: string | undefined, rel: string | undefined) => string | undefined;