/* Copyright IBM Corp. 2018 */
import { Injector } from '@angular/core';
import { Generator } from './../../utils';
import { UnaryFunction } from 'rxjs';
/**
 * Performs a lazy lookup of a dependency via an injector
 *
 * @param aInjector the injector
 * @param aToken   the token
 * @param aDefault an optional default of fallback token
 *
 * @return lazy injection result
 */
export declare function lazyInjector<T, R = T>(aInjector: Injector, aToken: any, aDefault?: T, aTransform?: UnaryFunction<T, R>): Generator<R>;