import { DICompareFunction } from 'di-controls/types';
import { InputSignal, Provider, Type } from '@angular/core';
/** Uses to implement host with compare function */
export declare abstract class DICompareHost<TModel, TValue extends TModel = TModel> {
    /** Uses to compare two values (useful to compare two objects, for example by id) */
    abstract compareFn: DICompareFunction<TModel, TValue> | InputSignal<DICompareFunction<TModel, TValue>>;
}
/**
 * Provides `DICompareHost` as a component that should be used to compare two values
 *
 * @param useExisting - Existing class that implements `DICompareHost`
 */
export declare function provideCompareHost<T extends DICompareHost<any>>(useExisting: Type<T>): Provider;