import { NgForOf } from '@angular/common';
import * as i0 from "@angular/core";
export declare class TrackByPropDirective<T> {
    private ngFor;
    ngForTrackByProp: keyof T;
    constructor(ngFor: NgForOf<T>);
    static ɵfac: i0.ɵɵFactoryDeclaration<TrackByPropDirective<any>, [{ host: true; }]>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<TrackByPropDirective<any>, "[ngForTrackByProp]", never, { "ngForTrackByProp": { "alias": "ngForTrackByProp"; "required": false; }; }, {}, never, never, true, never>;
}