export type Interpolator = (t: number) => string;

export type Shape = number[][] | string;

export interface Options {
    maxSegmentLength?: number;
    string?: boolean;
    single?: boolean;
}

export function interpolate(fromShape: Shape, toShape: Shape, options?: Options): Interpolator;

export function toCircle(fromShape: Shape, x: number, y: number, r: number): Interpolator;

export function toRect(
    fromShape: Shape,
    x: number,
    y: number,
    width: number,
    height: number,
    options?: Options,
): Interpolator;

export function fromCircle(x: number, y: number, radius: number, toShape: Shape, options?: Options): Interpolator;

export function fromRect(
    x: number,
    y: number,
    width: number,
    height: number,
    toShape: Shape,
    options?: Options,
): Interpolator;

export function separate(fromShape: Shape, toShapeList: Shape[], options?: Options): Interpolator;

export function combine(fromShapeList: Shape[], toShape: Shape, options?: Options): Interpolator;

export function interpolateAll(fromShapeList: Shape[], toShapeList: Shape[], options?: Options): Interpolator;

export function toPathString(ring: Array<[number, number]>): string;

export function splitPathString(pathString: string): string[];