import { Observable } from 'rxjs/Observable';
import { RenderingContext, SitePage } from './../../api';
import { IsPredicate } from './../predicates/predicates';
export declare const deepDistinctUntilChanged: <T>() => (source: Observable<T>) => Observable<T>;
export declare const pageDistinctUntilChanged: () => (source: Observable<SitePage>) => Observable<SitePage>;
export declare const pageArrayDistinctUntilChanged: () => (source: Observable<SitePage[]>) => Observable<SitePage[]>;
export declare const shareLast: <T>() => (source: Observable<T>) => Observable<T>;
export declare const filterNotNil: <T>() => (source: Observable<T>) => Observable<T>;
export declare const typedPluck: <T, K extends keyof T>(aKey: K) => (source: Observable<T>) => Observable<T[K]>;
export declare const filterString: () => (source: Observable<string>) => Observable<string>;
export declare const filterBoolean: () => (source: Observable<boolean>) => Observable<boolean>;
export declare const filterNumber: () => (source: Observable<number>) => Observable<number>;
export declare const filterObject: () => (source: Observable<object>) => Observable<object>;
export declare const filterArrayOf: <T>(aPredicate: IsPredicate<T>) => (source: Observable<T[]>) => Observable<T[]>;
export declare const pluckApiOrigin: () => (source: Observable<RenderingContext>) => Observable<string>;
export declare const pluckDeliveryOrigin: () => (source: Observable<RenderingContext>) => Observable<string>;
export declare const pluckCurrentPage: () => (source: Observable<RenderingContext>) => Observable<SitePage>;
/**
 * Converts the levels to a valid number value
 */
export declare const opLevels: (source: Observable<string | number>) => Observable<number>;
/**
* Operator to box the layout mode
*/
export declare const opBoxLayoutMode: (source: Observable<string>) => Observable<string>;