import { ObservableInput, OperatorFunction, ObservedValueOf } from "rxjs";
import { SUSPENSE } from "@react-rxjs/core";
/**
 * Same behaviour as rxjs' `switchMap`, but prepending every new event with
 * SUSPENSE.
 *
 * @param fn Projection function
 */
export declare const switchMapSuspended: <T, O extends ObservableInput<any>>(project: (value: T, index: number) => O) => OperatorFunction<T, typeof SUSPENSE | ObservedValueOf<O>>;