export interface ChartTheme {
    axisLineColor: string;
    gridColor: string;
    tooltipBg: string;
    tooltipFg: string;
    fontFamily: string;
    fontSize: number;
    areaOpacity: number;
}
/** Flush cached token values (call on theme change). */
export declare function clearTokenCache(): void;
/** Returns chart axis/grid/tooltip styling derived from --ov-* tokens. */
export declare function useChartTheme(): ChartTheme;
