import { Pointer } from '../pointer';
/**
 * Optional properties for the cache storage.
 */
export interface CacheProps {
    /**
     * The name of the S3 bucket to use as cache storage.
     */
    bucketName: string;
    /**
     * The name of the service using the cache storage.
     */
    serviceName: string;
}
/**
 * The cache storage class provides helper methods to be used
 * by middleware implementations in order to store and retrieve
 * arbitrary data models in and from the storage cache.
 */
export declare class CacheStorage {
    /**
     * The cache storage properties.
     */
    private props;
    /**
     * Cache storage constructor.
     */
    constructor(props?: CacheProps);
    /**
     * Hashes the key and data to create a unique
     * and stable identifier for the element in the cache.
     * @param key the key of the element to put
     * in the cache.
     * @param data the data to put in the cache.
     * @returns
     */
    private hash;
    /**
     * Inserts a new element in the cache.
     * @param key the key of the element to put
     * in the cache.
     * @param data the data to put in the cache.
     * @returns a pointer to the element in the cache.
     */
    put<T>(key: string, data: any): Promise<Pointer<T>>;
}