export declare function mergeObservables<TValue, TError extends Error>(...observables: Observable<TValue, TError>[]): Observable<TValue, TError>;
export declare function asyncMap<TInputValue, TOutputValue>(observable: Observable<TInputValue, Error>, mapCallback: (inputValue: TInputValue) => Promise<TOutputValue>): Observable<TOutputValue, Error>;
export declare function flatten<TValue, E extends Error = Error>(observable: Observable<TValue | TValue[] | TValue[][] | TValue[][][], E>, depth?: number): Observable<TValue, E>;