import type { FC, HTMLAttributes, ReactNode, Ref } from 'react';
import type { LineChartSeries } from './LineChartContext';
export interface LineChartHoverPopoverRowProps extends HTMLAttributes<HTMLDivElement> {
    ref?: Ref<HTMLDivElement>;
    /** Series whose colour and label feed the row. */
    series: LineChartSeries;
    /** Raw datum value at the active index. `null`/`undefined` renders an em-dash. */
    value?: number | string | null;
    /** Optional value formatter. Defaults to `Number.toLocaleString` / `String`. */
    formatValue?: (value: number | string | null | undefined) => ReactNode;
}
export declare const LineChartHoverPopoverRow: FC<LineChartHoverPopoverRowProps>;