import OlFeature from 'ol/Feature.js';
import OlGeomPoint from 'ol/geom/Point.js';
import OlGeomLine from 'ol/geom/LineString.js';
import { type Extent as OlExtent } from 'ol/extent.js';
/**
 * @param features the features to get the "properties" values from.
 * @param propertyKey the property key to get the value in the features.
 * @returns Distinct values of features for a given property's key.
 */
export declare const getDistinctFeaturesProperties: (features: OlFeature[], propertyKey: string) => unknown[];
/**
 * From points, create lines (0->1, 1->2, 2->3, etc.)
 * @param points points To create the line.
 * @param opt_onLineCreated Optional function to apply effect on each created
 * line.
 * @returns created lines from given points (0->1, 1->2, 2->3, etc.)
 */
export declare const getLinesBetweenPoints: (points: OlFeature<OlGeomPoint>[], opt_onLineCreated?: (line: OlFeature<OlGeomLine>, startPoint: OlFeature<OlGeomPoint>, endPoint: OlFeature<OlGeomPoint>) => void) => OlFeature<OlGeomLine>[];
/**
 * @returns The extent (not empty) of all given features.
 */
export declare const getFeaturesExtent: (features: OlFeature[]) => OlExtent | null;