declare module 'polygon-clipping' {
  export type Pair = [number, number];
  export type Ring = Pair[];
  export type Polygon = Ring[];
  export type MultiPolygon = Polygon[];
  type Geom = Polygon | MultiPolygon;
  export function intersection(geom: Geom, ...geoms: Geom[]): MultiPolygon;
  export function xor(geom: Geom, ...geoms: Geom[]): MultiPolygon;
  export function union(geom: Geom, ...geoms: Geom[]): MultiPolygon;
  export function difference(subjectGeom: Geom, ...clipGeoms: Geom[]): MultiPolygon;
}