import { HttpResponse } from '@angular/common/http';
import { ResourceBase } from '../resource/resource';
/**
 * Enum for response object markers.
 */
export declare enum ResourceCacheItemMarker {
    CACHED = "__cached_response__",
    PREPOPULATED = "__prepopulated_response__"
}
/**
 * Class definition for items on the cache. An item on the cache needs to hold the actual response from the
 * HTTP call, the resource used to make the HTTP call and the action options of the method used for
 * the HTTP call.
 */
export declare class ResourceCacheItem {
    protected _response: HttpResponse<any>;
    protected _resource: ResourceBase;
    protected _ttl: number;
    protected _timestamp: number;
    constructor(_response: HttpResponse<any>, _resource: ResourceBase, _ttl: number);
    /**
     * Gets a clone of the HTTP response we got from the HTTP call.
     * @returns {HttpResponse<any>}
     */
    get response(): HttpResponse<any>;
    /**
     * Gets the resource used for the HTTP call.
     * @returns {ResourceBase}
     */
    get resource(): ResourceBase;
    /**
     * Gets the timestamp the cache item was created at.
     * @returns {number}
     */
    get timestamp(): number;
    /**
     * Gets if the cache item is already stale (exceeded its TTL).
     * @returns {boolean}
     */
    get stale(): boolean;
}
export declare class PrepopulatedResourceCacheItem extends ResourceCacheItem {
    /**
     * Gets a clone of the HTTP response we got from the HTTP call.
     * @returns {HttpResponse<any>}
     */
    get response(): HttpResponse<any>;
}
export declare type ResourceCacheItemPromisable = ResourceCacheItem | Promise<ResourceCacheItem>;