/**
 * Measures a DOM element's height and keeps it up to date via `ResizeObserver`.
 * Returns a ref callback to attach to the element, plus the latest height.
 *
 * Used by the List renderer to track the column-header row's height so sticky
 * group headers and the sticky-group anchor can position themselves directly
 * underneath it, regardless of variant, custom header content, or hidden
 * headers.
 */
export declare function useElementHeight(): readonly [(el: HTMLElement | null) => void, number];
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