import * as i0 from "@angular/core";
export declare class WatcherHelper {
    private readonly _watchers;
    getWatchMethod(): (valueGetter: any, valueChangeCallback: any, options: any) => () => void;
    private _isDifferentValues;
    private _toComparable;
    private _checkObjectsFields;
    checkWatchers(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<WatcherHelper, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<WatcherHelper>;
}