/**
 * An interface for cache clients.
 * @template T The type of data being cached.
 */
export interface CacheClient<T> {
    /**
     * Adds a value to the cache for the specified cache key.
     * @param {string} key The cache key.
     * @param {T} value The value to cache.
     * @returns The value added to the cache.
     */
    setCacheValue(key: string, value: T): T;
    /**
     * Retrieves a value from the cache.
     * @param {string} key The cache key.
     * @returns The cache value as {T}, or null if the specified key was not found in the cache.
     */
    getCacheValue(key: string): T | null;
}
/**
 * Minimum configuration options for classes that implement @see CacheClient
 */
export interface CacheOptions {
    /**
     * Enable/disable caching mechanism
     * @default true
     */
    cacheEnabled?: boolean;
    /**
     * Cache timeout (sec)
     * @default 60
     */
    cacheTimeout?: number;
}
/**
 * A cache client that uses the 'memory-cache' library (https://github.com/ptarjan/node-cache).
 * This class is meant to be extended or used as a mixin; it's not meant to be used directly.
 * @template T The type of data being cached.
 * @mixin
 */
export declare class MemoryCacheClient<T> implements CacheClient<T> {
    options: CacheOptions;
    private cache;
    /**
     * Initializes a new instance of @see MemoryCacheClient using the provided @see CacheOptions
     * @param {CacheOptions} options Configuration options
     */
    constructor(options: CacheOptions);
    /**
     * Retrieves a value from the cache.
     * @template T The type of data being cached.
     * @param {string} key The cache key.
     * @returns The cache value as {T}, or null if the specified key is not found in the cache.
     */
    getCacheValue(key: string): T | null;
    /**
     * Adds a value to the cache for the specified cache key.
     * @template T The type of data being cached.
     * @param {string} key The cache key.
     * @param {T} value The value to cache.
     * @returns The value added to the cache.
     */
    setCacheValue(key: string, value: T): T;
}