/**
 * Custom hook to calculate label width and dynamically set
 * styles for masking the parent's border behind the label,
 * with support for theme switching via `data-theme`.
 *
 * @param label - The label text (for triggering recomputation when changed).
 * @returns [labelRef, dynamicStyles] - Ref to attach to <label>, and inline CSS vars for styling.
 */
export declare function useLabelStyle(label: string): readonly [import("react").RefObject<HTMLLabelElement | null>, import("react").CSSProperties];