import { BehaviorSubject } from 'rxjs';
import { DrawableOverlay } from '../../abstraction/types/abstraction';
import { IGoogleMapsMarker } from '../../modules/marker/i-google-maps-marker';
import { IGoogleMapsPolygon } from '../../modules/polygon/i-google-maps-polygon';
import { IGoogleMapsPolyline } from '../../modules/polyline/i-google-maps-polyline';
import { IGoogleMapsCircle } from '../../modules/circle/i-google-maps-circle';
import { IGoogleMapsData } from '../../modules/data/i-google-maps-data';
import { OverlaysState } from './overlays-state';
/**
 * Tracks the overlays added to and removed from the map for easy access.
 */
export declare class OverlaysTracker {
    readonly markers: IGoogleMapsMarker[];
    readonly polygons: IGoogleMapsPolygon[];
    readonly polylines: IGoogleMapsPolyline[];
    readonly circles: IGoogleMapsCircle[];
    readonly dataLayers: IGoogleMapsData[];
    /**
     * Emits an `OverlaysState` object every time an overlay is added or removed from the map.
     */
    readonly changes: BehaviorSubject<OverlaysState>;
    private map;
    /**
     * Registers an added overlay.
     *
     * @param {DrawableOverlay} overlay The overlay that was added to the map.
     */
    add(overlay: DrawableOverlay): void;
    /**
     * Registers a removed overlay.
     *
     * @param {DrawableOverlay} overlay The overlay that was removed from the map.
     */
    remove(overlay: DrawableOverlay): void;
    private detectCollection;
    private state;
    private reportChanges;
}