import { Observable } from 'rxjs';
import { SubscriberSpy } from './subscriber-spy';
import { ObserverSpyConfig } from './observer-spy';
export declare function subscribeSpyTo<T>(observableUnderTest: Observable<T>, config?: ObserverSpyConfig): SubscriberSpy<T>;
export declare function subscribeAndSpyOn<T>(observableUnderTest: Observable<T>): SubscriberSpy<T>;
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