import { InjectionToken } from '@angular/core';
import { CacheItem } from './cache-item';
import { Storage } from './storage';
export declare const STORAGE_CACHE_KEY_PREFIX: InjectionToken<string>;
export declare const DEFAULT_STORAGE_CACHE_KEY_PREFIX = "_cache_.";
export declare const STORED_VERSION_KEY = "_ngcache_version_";
export declare class CacheLocalStorage implements Storage {
    private readonly _cacheKeyPrefix;
    private _enabled;
    readonly enabled: boolean;
    readonly name: string;
    readonly keys: string[];
    constructor(cacheKeyPrefix?: string);
    setItem(key: string, value: CacheItem): boolean;
    getItem(key: string): CacheItem | undefined;
    removeItem(key: string): void;
    clear(): void;
    _getNgCacheVersion(): string | null | undefined;
    _setNgCacheVersion(ver: string): void;
}