/// <reference types="googlemaps" />
import { IGoogleMapsFeature } from '../feature/i-google-maps-feature';
/**
 * Automates and facilitates tracking of geometry features in a data layer.
 *
 * @export
 * @class FeatureTracker
 */
export declare class FeatureTracker {
    /**
     * The list of features that are currently present on the data layer.
     *
     * @type {IGoogleMapsFeature[]}
     */
    readonly list: IGoogleMapsFeature[];
    /**
     * Registeres a feature as added.
     *
     * @param {IGoogleMapsFeature} feature
     */
    add(feature: IGoogleMapsFeature): void;
    /**
     * Unregisteres a removed feature from the tracker.
     *
     * @param {(google.maps.Data.Feature)} feature The feature to remove from the list.
     * @returns {IGoogleMapsFeature} The removed feature or `null` if not found.
     */
    remove(feature: google.maps.Data.Feature): IGoogleMapsFeature;
    /**
     * Unregisteres a removed feature from the tracker.
     *
     * @param {(IGoogleMapsFeature)} feature The feature to remove from the list.
     * @returns {IGoogleMapsFeature} The removed feature or `null` if not found.
     */
    remove(feature: IGoogleMapsFeature): IGoogleMapsFeature;
    /**
     * Unregisteres a removed feature from the tracker.
     *
     * @param {(string | number)} featureId The id of the feature to remove from the list.
     * @returns {IGoogleMapsFeature} The removed feature or `null` if not found.
     */
    remove(featureId: string | number): IGoogleMapsFeature;
    /**
     * @ignore
     */
    remove(featureOrId: string | number | google.maps.Data.Feature | IGoogleMapsFeature): IGoogleMapsFeature;
    /**
     * `true` if the tracker doesn't have any features registered; otherwise `false`.
     *
     * @readonly
     * @type {boolean}
     */
    get isEmpty(): boolean;
    /**
     * `true` if the tracker has at least one registered feature; otherwise `false`.
     *
     * @readonly
     * @type {boolean}
     */
    get hasFeatures(): boolean;
}