import { Observable } from 'rxjs';
/**
 * Method calls rxjs `lastValueFrom` with empty value `undefined` or provided emptyValue
 * @param source - Observable source to be processed
 * @param emptyValue - Empty value that is returned in case of `EmptyError`
 */
export declare function lastValueFrom<TResult, TEmpty = undefined>(source: Observable<TResult>, emptyValue?: TEmpty): Promise<TResult | TEmpty>;
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