/**
 * Point-in-polygon and point-to-polygon distance for WGS84 rings, sufficient
 * for "is this point inside / how far is the nearest mapped extent" at the
 * radii gaff-check uses (≤ ~5 km). Distances use a local equirectangular
 * projection — error is negligible at these scales and latitudes.
 */
export type Ring = Array<[number, number]>;
export type Polygon = Ring[];
export type MultiPolygon = Polygon[];
export declare function pointInPolygon(lng: number, lat: number, polygon: Polygon): boolean;
export declare function pointInMultiPolygon(lng: number, lat: number, mp: MultiPolygon): boolean;
/**
 * Distance in metres from a WGS84 point to a multipolygon's boundary;
 * 0 when the point lies inside.
 */
export declare function distanceToMultiPolygon(lng: number, lat: number, mp: MultiPolygon): number;