import { OnDestroy } from '@angular/core';
import * as i0 from "@angular/core";
/**
 * StorageChangeEvent represents the change event of the storage.
 *
 * @interface
 * @group Public API
 */
export interface StorageChangeEvent {
    /**
     * The key of the item that was changed.
     */
    key: string;
    /**
     * The value of the item before the change.
     */
    oldValue: string | null;
    /**
     * The value of the item after the change.
     */
    newValue: string | null;
}
/**
 * RbStorageService is a service that provides an observable stream of storage change events.
 *
 * @internal
 * @group Services
 */
export declare class StorageService implements OnDestroy {
    #private;
    /**
     * The observable stream of storage change events, shared among subscribers.
     *
     * @readonly
     */
    readonly changes$: import("rxjs").Observable<StorageChangeEvent>;
    /**
     * Creates an instance of RbStorageService.
     *
     * @param {Document} document - the document object provided by Angular's DI.
     */
    constructor(document: Document);
    /**
     * An Angular lifecycle hook that removes the storage event listener.
     *
     * @internal
     */
    ngOnDestroy(): void;
    /**
     * Sets a key-value pair in the local storage and emits a change event.
     *
     * @param {string} key - The key to set
     * @param {string} newValue - The value to set
     */
    setItem(key: string, newValue: string): void;
    /**
     * Gets the value of a key in the local storage.
     *
     * @param {string} key - The key to get the value of
     * @returns {(string | null)} The value of the key or null if it does not exist
     */
    getItem(key: string): string | null;
    /**
     * Removes the value of a key from the local storage and emits a change event.
     *
     * @param {string} key - The key to remove
     */
    removeItem(key: string): void;
    /**
     * Clears all keys from the local storage and emits a change event for each removed key.
     */
    clear(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<StorageService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<StorageService>;
}