import { TrackByFunction } from '@angular/core';
import { Items } from './providers/items';
import * as i0 from "@angular/core";
export declare class ClrDatagridItemsTrackBy<T = any> {
    private _items;
    constructor(_items: Items<T>);
    set trackBy(value: TrackByFunction<T>);
    static ɵfac: i0.ɵɵFactoryDeclaration<ClrDatagridItemsTrackBy<any>, [{ optional: true; }]>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<ClrDatagridItemsTrackBy<any>, "[ngForTrackBy]", never, { "trackBy": "ngForTrackBy"; }, {}, never, never, false, never>;
}