import { Observable } from 'rxjs';
/**
 * Create a dummy async observable that emits a single `value` after the specified `delay` and then completes.
 *
 * @param value the value to emit or `-1` to throw an exception instead
 * @param delay delay in milliseconds before the observable should emit
 * @param log optional string array where a simple log messages get appended as the flow of the observable proceeds
 * @category Test Helper
 */
export declare function createAsyncObservable(value: number, delay: number, log?: string[]): Observable<number>;
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