/**
 * Utility for working with different storages.
 *
 * Built-in 'in-memory' storage fallback.
 */
export declare class DataStorage {
    protected storage?: Storage;
    clear(): void;
    get length(): number;
    get storageObj(): Storage;
    getItem(key: string): string | null;
    getItemArray(key: string): Array<any>;
    getItemBoolean(key: string, defaultValue?: boolean): boolean;
    getItemRecord(key: string): Record<string, any>;
    key(index: number): string | null;
    removeItem(key: string): void;
    setItem(key: string, value: string): void;
    setItemArray(key: string, value: Array<any>): void;
    setItemBoolean(key: string, value: boolean): void;
    setItemRecord(key: string, value: Record<string, any>): void;
}
export declare class LocalDataStorage extends DataStorage {
    get storageObj(): Storage;
}
export declare class SessionDataStorage extends DataStorage {
    get storageObj(): Storage;
}