import { Observable } from 'rxjs';
/**
 * Retrieves next emit of an observable in a synchronous operation.
 * Fails if the observable throws an exception, if it completes before emitting
 * or if it is not synchronous.
 *
 * @param observable source observable to get a synchronous emit from
 * @typeParam T type of the observable value
 * @category Test Helper
 */
export declare function getSynchronousEmit<T>(observable: Observable<T>): T;
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