import { Observable } from 'rxjs';
import { EffectContext, EffectMiddlewareLike } from '../../effects/effects.interface';
/**
 * @deprecated since version 4.0, apply middlewares direcly to the effect Observable chain
 *
 * `use` operator will be deleted in the next major version (v5.0)
 */
export declare const use: <I, O>(middleware: EffectMiddlewareLike<I, O>, effectContext?: EffectContext<any, import("rxjs").SchedulerLike> | undefined) => (source$: Observable<I>) => Observable<O>;
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