export declare const CurveUtils: {
    linear: (coords: Array<{
        x: number;
        y: number;
    }>) => string;
    natural: (coordinates: Array<{
        x: number;
        y: number;
    }>) => string;
    monotoneX: (coordinates: Array<{
        x: number;
        y: number;
    }>) => string;
    stepBefore: (coordinates: Array<{
        x: number;
        y: number;
    }>) => string;
    stepAfter: (coordinates: Array<{
        x: number;
        y: number;
    }>) => string;
};