export type SafeTooltipItem = {
    name?: unknown;
    dataKey?: unknown;
    value?: number | string | null | undefined;
    color?: unknown;
};
export type TooltipPayload = {
    active?: boolean;
    label?: string | number;
    payload?: readonly SafeTooltipItem[];
    coordinate?: {
        x: number;
        y: number;
    } | null;
};
export declare const toNumberOrNull: (value: unknown) => number | null;
export declare const computeInterpolatedValueForLabel: (allLabels: Array<string | number> | undefined, data: Array<unknown> | undefined, targetLabel: string | number | undefined) => number | null;