import { NgForOf } from '@angular/common';
import * as i0 from "@angular/core";
export declare class TrackByIdDirective<T extends {
    id: unknown;
}> {
    private ngFor;
    constructor(ngFor: NgForOf<T>);
    static ɵfac: i0.ɵɵFactoryDeclaration<TrackByIdDirective<any>, [{ host: true; }]>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<TrackByIdDirective<any>, "[ngForTrackById]", never, {}, {}, never, never, true, never>;
}