import { IObservable } from '../internal/Observable';
export declare function switchLatest<T>(source: IObservable<IObservable<T>>): IObservable<T>;
export declare const switchMap: {
    <T, K>(mapper: (t: K) => IObservable<T>, source: IObservable<K>): IObservable<T>;
    <T, K>(mapper: (t: K) => IObservable<T>): (source: IObservable<K>) => IObservable<T>;
};