import { BaseLayer } from './index.common';
import { LayerOptions, TileLayerOptions } from '.';
export declare enum TileSubstitutionPolicy {
    TILE_SUBSTITUTION_POLICY_ALL = 0,
    TILE_SUBSTITUTION_POLICY_VISIBLE = 1,
    TILE_SUBSTITUTION_POLICY_NONE = 2
}
export declare abstract class Layer<T extends NTLayer, U extends LayerOptions> extends BaseLayer<T, U> {
    visibleZoomRange: [number, number];
    refresh(): void;
}
export declare abstract class TileLayer<T extends NTTileLayer, U extends TileLayerOptions> extends Layer<T, U> {
    preloading: boolean;
    synchronizedRefresh: boolean;
    zoomLevelBias: number;
    maxOverzoomLevel: number;
    maxUnderzoomLevel: number;
    tileSubstitutionPolicy: TileSubstitutionPolicy;
    clearTileCaches(all: boolean): void;
    getDataSource(): any;
    getProjection(): any;
}