/**
 * Utility class for caching stable data
 */
export declare class CachedValue<T> {
    private cachedValue;
    private cacheTimestamp;
    private cacheMaxAge;
    private refreshData;
    private refreshPromise;
    /**
     * @constructor
     * @param refreshData function that refresh and return the data
     * @param {number|undefined} cacheMaxAge time in millisecond to expire cache
     */
    constructor(refreshData: (params?: any) => Promise<T>, cacheMaxAge?: number);
    /**
     * @private
     * Validates if internal cache is valid or expired
     */
    private isCacheValid;
    /**
     * Returns cached data if valid or request fresh data if cache is invalid
     * @param params use this params to request data if cache is expired
     */
    getValue(params?: any): Promise<T>;
}