import type { GanttChartFormatter, GanttSegmentData } from '../../types/gantt-chart.js';
export declare const GanttChartTooltipHeader: ({ segment, isDate, formatter, }: {
    segment: Pick<GanttSegmentData, "start" | "end">;
    isDate: boolean;
    formatter?: GanttChartFormatter;
}) => import("react/jsx-runtime").JSX.Element;