/**
 * Core DOM measurement engine.
 * Walks the slotted DOM tree and extracts leaf element positions/sizes
 * to generate shimmer overlay blocks.
 *
 * Based on a well-established technique (getBoundingClientRect overlay skeletons)
 * with prior art from page-skeleton-webpack-plugin (2018)
 * and @findify/skeleton-generator (~2019).
 */
interface BaseInfo {
    x: number;
    y: number;
    width: number;
    height: number;
    borderRadius: string;
}
export interface ElementInfo extends BaseInfo {
    isContainer?: boolean;
    containerBg?: string;
    containerBorder?: string;
    containerShadow?: string;
}
export interface ContainerInfo extends BaseInfo {
    backgroundColor: string;
    border: string;
    boxShadow: string;
}
/**
 * @param piercedRoots collects every open shadow root reached, so the caller can observe
 *   them. MutationObserver does not cross shadow boundaries, so a pierced component
 *   re-rendering its own content is invisible without this.
 */
export declare function extractElementInfo(element: Element, parentRect: DOMRect, pierceShadow?: boolean, piercedRoots?: Set<ShadowRoot>): ElementInfo[];
export declare function extractContainerInfo(element: Element, parentRect: DOMRect): ContainerInfo | null;
/**
 * Stamp the measured row `count` times down the page, offsetting each copy by the row
 * height plus `gap`. Container boxes are re-emitted per copy so repeated cards keep
 * their background, border and shadow.
 */
export declare function replicateRows(blocks: ElementInfo[], containers: ContainerInfo[], { count, gap, rowHeight }: {
    count: number;
    gap: number;
    rowHeight: number;
}): ElementInfo[];
export declare function createResizeObserver(element: Element, callback: () => void): ResizeObserver;
export {};