import { ModificationTree } from '../types';
declare type WatcherCallback = (modificationTree: ModificationTree) => void;
export declare abstract class Observable {
    private static idCounter;
    readonly _observableId: number;
    protected _watchedTargets: {
        [id: string]: {
            target: Observable;
            watcherCount: number;
        };
    };
    protected _watchers: Array<{
        context: any;
        callback: WatcherCallback;
    }>;
    _watchBy(context: any, callback: WatcherCallback): void;
    _stopWatchBy(context: any): void;
    protected _emitValueChange(modificationTree: ModificationTree): void;
    protected _registerChild(field: () => string | string, child: Observable): void;
    protected _unregisterChild(childOrChildId: Observable | string): void;
}
export {};