import { Observable, OperatorFunction } from 'rxjs';
export declare const mapKeysTo: <R extends Record<string, unknown>, K extends keyof R>(keys: K[]) => OperatorFunction<R, Pick<R, K>>;
export declare const watchKeys: <R extends Record<string, unknown>, K extends keyof R>(keys: K[]) => (stream: Observable<R>) => Observable<Pick<R, K>>;
export declare function observeResize(element: HTMLElement): Observable<ResizeObserverEntry[]>;
export declare const waitForSwitch: <O>(waitForStream: Observable<O>) => <N>(stream: Observable<N>) => Observable<N>;
export declare const deferNextResult: <T>(stream: Observable<T>) => () => Observable<T>;
export declare function idle(): Observable<void>;
export declare function deferIdle<T>(callback: () => Observable<T>): Observable<T>;
export declare const observeMutation: (target: Node, options?: MutationObserverInit) => Observable<MutationRecord[]>;
export declare function observeIntersection(element: HTMLElement, options?: IntersectionObserverInit): Observable<IntersectionObserverEntry[]>;