import { ObservableInput, OperatorFunction, ObservedValueOf } from '../types';
export declare function concatMapTo<T, O extends ObservableInput<any>>(observable: O): OperatorFunction<T, ObservedValueOf<O>>;
/** @deprecated */
export declare function concatMapTo<T, O extends ObservableInput<any>>(observable: O, resultSelector: undefined): OperatorFunction<T, ObservedValueOf<O>>;
/** @deprecated */
export declare function concatMapTo<T, R, O extends ObservableInput<any>>(observable: O, resultSelector: (outerValue: T, innerValue: ObservedValueOf<O>, outerIndex: number, innerIndex: number) => R): OperatorFunction<T, R>;