import { SpyObject } from '../mock';
import { Token } from '../token';
/**
 * @internal
 */
export declare abstract class BaseSpectator {
    inject<T>(token: Token<T>): SpyObject<T>;
    /**
     * Execute any pending effects.
     */
    flushEffects(): void;
    runInInjectionContext<T>(fn: () => T): T;
}