import { Cache } from './cache';
import { CacheItem } from './cache-item';
import { Storage } from './storage';
export declare class MemoryCache implements Cache {
    private readonly _storage?;
    private readonly _store;
    private _storageKeyLoaded;
    readonly storage: Storage | null | undefined;
    readonly keys: string[];
    constructor(_storage?: Storage | undefined);
    init(data?: {
        [key: string]: CacheItem;
    }): void;
    setItem(key: string, value: CacheItem): void;
    getItem(key: string): CacheItem | null | undefined;
    removeItem(key: string): void;
    clear(): void;
}