import { Context as Context$1 } from 'apprt-core/TreeWalker';
import { LayerNode, VisitCodes } from './LayerTraverser.js';
import Layer from '@arcgis/core/layers/Layer';
import Map from '@arcgis/core/Map';
import Collection from '@arcgis/core/core/Collection';
import Sublayer from '@arcgis/core/layers/support/Sublayer';
import WMSSublayer from '@arcgis/core/layers/support/WMSSublayer';

type NotifyReason = "added" | "removed" | "moved";
type Context = Context$1<LayerNode> & {
    change: {
        name: string;
        added?: boolean;
        removed?: boolean;
        moved?: boolean;
    } & ({
        name: "added";
        added: true;
    } | {
        name: "removed";
        removed: true;
    } | {
        name: "moved";
        moved: true;
    });
};
interface LayerObserverOptions {
    map: Map;
    layers: Collection<Layer | Sublayer | WMSSublayer>;
    onlyWatching: boolean;
    notify(layer: LayerNode, context: Context): void;
    filter(layer: LayerNode, context: Context): undefined | boolean | VisitCodes;
}
interface LayerObserver {
    map: Map | undefined;
    layers: Collection<Layer | Sublayer | WMSSublayer> | undefined;
    start(skipInitial?: boolean): void;
    stop(skipCleanup?: boolean): void;
}
declare function createLayerObserver({ map, layers, filter, notify, onlyWatching }?: Partial<LayerObserverOptions>): LayerObserver;

export { createLayerObserver, createLayerObserver as default };
export type { Context, LayerObserver, LayerObserverOptions, NotifyReason };