import { type ObservableLike, Observable } from "./Observable.js";
/**
 * Calls the callback function for each value emitted by the observable. The
 * callback function returns a new observable that is flattened to avoid
 * creating an observable of observables.
 *
 * The observable completes when the source observable and all inner observables
 * complete.
 */
export declare function flatMap<T, U>(callback: (value: T) => ObservableLike<U> | PromiseLike<U>): (observable: ObservableLike<T>) => Observable<U>;
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