/**
 * Base Storage Service
 * Abstract base class providing common functionality for all storage implementations
 */
import type { StorageItem } from "../../models/storageItem";
import type { IStorageService } from "./IStorageService";
/**
 * Abstract base class for storage services
 */
export declare abstract class BaseStorageService implements IStorageService {
    protected storageAvailable: boolean;
    protected abstract readonly storageType: string;
    protected storage: Storage | null;
    constructor();
    /**
     * Check if storage is available
     */
    isAvailable(): boolean;
    /**
     * Save a storage item
     */
    abstract save(key: string, value: string): void;
    /**
     * Retrieve a storage item
     */
    abstract retrieve(key: string): StorageItem | null;
    /**
     * Remove a storage item
     */
    abstract remove(key: string): void;
    /**
     * Clear all items
     */
    abstract clear(): void;
    /**
     * Check if storage type is available
     * Reference: MDN Web Docs
     * https://developer.mozilla.org/en-US/docs/Web/API/Web_Storage_API/Using_the_Web_Storage_API
     */
    protected checkAvailability(): boolean;
    /**
     * Get the underlying storage object
     */
    protected abstract getStorage(): Storage | null;
    /**
     * Throw error if storage is unavailable
     */
    protected throwIfUnavailable(): void;
}
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