import OlMap from 'ol/Map.js';
import OlLayerBase from 'ol/layer/Base.js';
import { LayerGroup, type LayerGroupOptions } from './layer-group.js';
export declare const DefaultLayerBGGroupUid = "olcBackgroundLayerGroupUid";
/**
 * LayerGroup specialized to manage background layers (mostly tiled layers).
 * Each instance must have a unique name (The default name will be valid for the first group).
 * The default position is 0.
 */
export declare class BackgroundLayerGroup extends LayerGroup {
    constructor(map: OlMap, options?: LayerGroupOptions);
    /**
     * @returns the first visible layer, or null if none is visible.
     */
    getFirstVisible(): OlLayerBase | null;
    /**
     * Set one background layer as visible, all others as not visible.
     * DispatchLayerPropertyChanged is called for every changed layer.
     */
    toggleVisible(targetLayerUid: string): void;
}