import * as i0 from "@angular/core";
export declare class StorageService {
    private memoryStore;
    private readonly useLocalStorage;
    private _prefix;
    get prefix(): string;
    set prefix(prefix: string);
    constructor();
    /**
     * Gets an item.
     *
     * @param key Key to identify the item
     * @returns The item (if any) retrieved by the key
     */
    getItem(key: string): string | null;
    /**
     * Gets all items from the storage.
     *
     * @returns All items stored
     */
    getItems(): {
        [key: string]: any;
    };
    /**
     * Stores an item
     *
     * @param key Key to identify the item
     * @param data Data to store
     */
    setItem(key: string, data: string): void;
    /** Removes all currently stored items. */
    clear(): void;
    /**
     * Removes a single item.
     *
     * @param key Key to identify the item
     */
    removeItem(key: string): void;
    /**
     * Is any item currently stored under `key`?
     *
     * @param key Key identifying item to check
     * @returns True if key retrieves an item, false otherwise
     */
    hasItem(key: string): boolean;
    private storageAvailable;
    static ɵfac: i0.ɵɵFactoryDeclaration<StorageService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<StorageService>;
}