import { HttpClient } from '@angular/common/http';
import { InjectionToken } from '@angular/core';
import { Observable } from 'rxjs';
import { Cache } from './cache';
import { CacheEntryOptions } from './cache-entry-options';
import { CacheOptions } from './cache-options';
import { InitialCacheData } from './initial-cache-data';
export declare const REMOTE_CACHE_CHECKER_ENDPOINT_URL: InjectionToken<string>;
export declare class CacheService {
    private readonly _cache;
    private readonly _platformId;
    private readonly _httpClient?;
    private readonly _cacheOptions;
    private readonly _logger;
    private readonly _remoteCacheCheckInterval;
    readonly enableRemoteCacheCheck: boolean;
    constructor(_cache: Cache, _platformId: Object, _httpClient?: HttpClient | undefined, data?: InitialCacheData, options?: CacheOptions, remoteCacheCheckerEndpointUrl?: string, loggerFactory?: any);
    getItem<T>(key: string): T | null;
    getOrSetSync<T>(key: string, factory: (entryOptions: CacheEntryOptions) => T, options?: CacheEntryOptions): T;
    getOrSetPromise<T>(key: string, factory: (entryOptions: CacheEntryOptions) => Promise<T>, options?: CacheEntryOptions): Promise<T>;
    getOrSet<T>(key: string, factory: (entryOptions: CacheEntryOptions) => Observable<T>, options?: CacheEntryOptions): Observable<T>;
    setItem(key: string, value: Object, options?: CacheEntryOptions): void;
    removeItem(key: string): void;
    clear(): void;
    private checkStorage;
    private logDebug;
    private logError;
    private getOrSetInternal;
    private invokeFactory;
    private setItemInternal;
    private refreshLastAccessTime;
    private prepareCacheEntryOptions;
    private isValid;
}