/**
 * Locale-aware number formatting helpers for charts. Mirrors `useChartColor`:
 * a hook that returns memoized formatting functions so chart consumers share one
 * consistent compact-number style instead of hand-rolling `>= 1000 → k` logic.
 *
 * @returns {{ formatCompact: (value: number) => string }} An object exposing
 * `formatCompact`, a locale-aware compact formatter (e.g. `40000 → "40K"`, `40_000_000 → "40M"`).
 * @example Abbreviate a y-axis value
 * ```tsx
 * const { formatCompact } = useChartNumberFormat();
 * formatCompact(40000); // "40K"
 * ```
 */
export declare const useChartNumberFormat: () => {
    formatCompact: (value: number) => string;
};