import { type ReactNode } from 'react';
/**
 * Data passed to the GaugeChart custom tooltip render function.
 * @public
 */
export interface GaugeChartTooltipItem {
    /**
     * Raw numerical value displayed by the gauge.
     */
    value: number;
    /**
     * Value formatted via the chart's formatter (and unit, if any).
     */
    formattedValue: string;
    /**
     * Colour currently applied to the gauge arc (resolved from explicit
     * `color`, ColorRules or palette).
     */
    color: string | undefined;
    /**
     * Optional `name` provided through the `GaugeChart.Tooltip` slot.
     */
    name: string | undefined;
    /**
     * Optional unit string used by the formatter, when available.
     */
    unit: string | undefined;
}
/**
 * Render function used to customise the body of the GaugeChart tooltip.
 * @public
 */
export type GaugeChartTooltipHandler = (item: GaugeChartTooltipItem) => ReactNode;
/**
 * Props for the GaugeChart.Tooltip slot component
 * @public
 */
export interface GaugeChartTooltipProps {
    /**
     * Optional name to display in the tooltip
     */
    name?: string;
    /**
     * Optional custom tooltip template. When provided, the function is
     * invoked with the current gauge value and its result replaces the
     * default tooltip body. Use `ChartTooltip` atoms (e.g.
     * `ChartTooltip.SeriesItem`) to build a structured layout, or any
     * `ReactNode` for free-form content.
     */
    children?: GaugeChartTooltipHandler;
    /**
     * When `true`, the tooltip is not rendered.
     * @defaultValue false
     */
    hidden?: boolean;
}
/**
 * Internal config shape used after `children` has been remapped to
 * `template`, mirroring the AnnotationsChart tooltip pipeline.
 * @internal
 */
export interface GaugeChartTooltipConfig {
    name?: string;
    /** Map from slot `children` to `template` internally */
    template?: GaugeChartTooltipHandler;
    hidden?: boolean;
}
/**
 * Slot component for Gauge Chart tooltip
 * @public
 */
export declare const Tooltip: {
    (_props: GaugeChartTooltipProps): null;
    displayName: string;
};