/// <reference types="d3-shape" />
/**
 * Copyright (c) HashiCorp, Inc.
 * SPDX-License-Identifier: MPL-2.0
 */
import * as shape from 'd3-shape';
type CurveArgs = {
    name: string;
    beta?: number;
    tension?: number;
    alpha?: number;
};
/**
 * A mapping of `string`s to D3 curve factories.
 *
 * This is useful for safely specifying curve functions in templates.
 */
declare const CURVES: {
    [key: string]: shape.CurveFactory | shape.CurveBundleFactory;
};
/**
 * Creates a curve function from a string or argument object.
 *
 * @param [curve] - When a string, looks up the corresponding curve factory and returns it.
 *                  When a `CurveArgs`, looks up the corresponding curve factory based on `curve.name`,
 *                  applies parameters, and returns the resulting curve function.
 * @throws {Error} - When there is no curve factory for the specified curve.
 */
declare const curveFor: (curve?: string | CurveArgs) => shape.CurveFactory | shape.CurveBundleFactory;
export { CurveArgs, CURVES, curveFor };