/**
 * Get reference line styling
 * @param lineColor Optional custom color for the line
 * @param backgroundColor Background color to ensure contrast against (required for color adjustment)
 */
export declare const getReferenceLineStyle: (lineColor?: string, backgroundColor?: string) => {
    emphasis: {
        disabled: boolean;
    };
    lineStyle: {
        color: string;
        type: readonly [2, 3];
        width: number;
    };
    label: {
        show: boolean;
        position: "start";
        distance: number;
        formatter: (params: {
            name?: string;
            value?: number | string;
        }) => string;
        backgroundColor: string;
        color: string;
        borderWidth: number;
        borderColor: string;
        padding: number[];
        borderRadius: number;
        fontSize: number;
        fontWeight: number;
    };
};
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