import { TrackByFunction } from '@angular/core';
import { PipeTransform } from '@angular/core';
/**
 *
 * @example
 *
 * <div *ngFor="let item of items; trackBy: 'id' | trackByProp">{{item}}</div>
 * <div *ngFor="let item of items; trackBy: 'index' | trackByProp">{{item}}</div>
 * <div *ngFor="let item of items; trackBy: ['id', 'type'] | trackByProp">{{item}}</div>
 *
 */
export declare class DatoTrackByPropPipe implements PipeTransform {
    transform(propertyNames: 'index'): TrackByFunction<any>;
    transform(propertyNames: string): TrackByFunction<any>;
    transform(propertyNames: string[]): TrackByFunction<any>;
}