/**
 * Fetches an item from session storage without throwing an exception
 * @param key The key of the item to fetch from session storage
 */
export declare function getItem(key: string): string | null;
/**
 * Inserts an item into session storage without throwing an exception
 * @param key The key of the item to add to session storage
 * @param data The data to put into session storage
 */
export declare function setItem(key: string, data: string): void;