import { Feature, GeometryObject, Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, FeatureCollection, GeometryCollection } from 'geojson';
import { Units } from '@turf/helpers';

interface Options {
  units?: Units;
  steps?: number;
}

/**
 * http://turfjs.org/docs/#buffer
 */
declare function buffer(
  feature:
    | Feature<GeometryObject>
    | Point
    | LineString
    | Polygon
    | MultiPoint
    | MultiLineString
    | MultiPolygon,
  radius?: number,
  options?: Options
): Feature<Polygon | MultiPolygon> | undefined;
declare function buffer(
  feature: FeatureCollection<GeometryObject> | GeometryCollection,
  radius?: number,
  options?: Options
): FeatureCollection<Polygon | MultiPolygon> | undefined;

export { buffer, buffer as default };