export declare const curves: {
    linear: import("d3-shape").CurveFactory;
    'linear-closed': import("d3-shape").CurveFactory;
    step: import("d3-shape").CurveFactory;
    'step-before': import("d3-shape").CurveFactory;
    'step-after': import("d3-shape").CurveFactory;
    basis: import("d3-shape").CurveFactory;
    'basis-open': import("d3-shape").CurveFactory;
    'basis-closed': import("d3-shape").CurveFactory;
    bundle: import("d3-shape").CurveBundleFactory;
    cardinal: import("d3-shape").CurveCardinalFactory;
    'cardinal-open': import("d3-shape").CurveCardinalFactory;
    'cardinal-closed': import("d3-shape").CurveCardinalFactory;
    monotone: import("d3-shape").CurveFactory;
};