/**
 * Gets the currently hovered chart ID.
 * Called at tooltip render time to get the latest value.
 */
export declare function getCurrentlyHoveredChartId(): string | null;
/**
 * Hook to manage chart hover state for tooltip display.
 * Ensures only one chart shows its tooltip at a time when using syncId.
 */
export declare function useChartHover(): {
    handleMouseEnter: () => void;
    handleMouseLeave: () => void;
    chartId: string;
};
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