import { MapFeature } from '../models/models.mapFeature';
/**
 * Returns the unique identifier for a GeoJSON feature.
 *
 * By default, uses the RFC 7946 standard top-level "id" property.
 * If a custom property name is provided, checks that property in both the top-level and the properties object.
 * Throws an error if no identifier is found.
 *
 * @param {MapFeature} feature - The GeoJSON feature object.
 * @param {string} [featureIdProperty='id'] - The property name to use for the identifier (defaults to "id").
 * @returns {string | number} The feature identifier if found.
 * @throws {Error} If the feature does not have an identifier.
 */
export declare function getFeatureId(feature: MapFeature, featureIdProperty?: string): string | number;