import { type TrackByFunction } from '@angular/core';
import { type ModelKeyRef, type UniqueModel } from '@dereekb/util';
export declare const TRACK_BY_MODEL_ID: TrackByFunction<UniqueModel>;
export declare function trackByUniqueIdentifier<T extends UniqueModel>(): TrackByFunction<T>;
export declare const TRACK_BY_MODEL_KEY: TrackByFunction<ModelKeyRef>;
export declare function trackByModelKeyRef<T extends ModelKeyRef>(): TrackByFunction<T>;
