import { Contact, ContactCache } from '../models';
import { CacheItemState } from '../models/cache-item-state.model';
import { StorageAdapter } from '../models/storage-adapter.model';
export declare class ContactCacheStorage implements ContactCache {
    private LOG_PREFIX;
    private storage;
    private cacheRefreshIntervalMs;
    constructor(storageAdapter: StorageAdapter);
    get(key: string, getFreshValue?: (key: string) => Promise<Contact[]>): Promise<Contact[] | CacheItemState>;
    set(key: string, contacts: Contact[]): Promise<void>;
    private setCacheState;
    delete(key: string): Promise<void>;
    private getRefreshed;
    private getCacheItemKey;
}