export declare class StorageHelper {
    private static isBrowser;
    /**
     * Saves data to localStorage.
     * Automatically stringifies objects, arrays, booleans, and numbers.
     */
    static set(key: string, value: any): void;
    /**
     * Retrieves data from localStorage.
     * Tries to parse JSON; returns string (or original type) if parsing fails.
     */
    static get<T = any>(key: string): T | string | null;
    /**
     * Removes a specific item.
     */
    static remove(key: string): void;
    /**
     * Clears all local storage.
     */
    static clear(): void;
}
export declare class SessionStorageHelper {
    private static isBrowser;
    /**
     * Saves data to sessionStorage.
     * automatically stringifies objects/arrays.
     */
    static set(key: string, value: any): void;
    /**
     * Retrieves data from sessionStorage.
     * Tries to parse JSON; returns string if parsing fails.
     */
    static get<T = any>(key: string): T | string | null;
    /**
     * Removes a specific item.
     */
    static remove(key: string): void;
    /**
     * Clears all session storage.
     */
    static clear(): void;
}