import { Observable } from 'rxjs/Observable';
import { AsyncLocalDatabase } from './databases/async-local-database';
import { JSONSchema } from './validation/json-schema';
import { JSONValidator } from './validation/json-validator';
export interface ALSGetItemOptions {
    schema?: JSONSchema | null;
}
export declare class AsyncLocalStorage {
    protected database: AsyncLocalDatabase;
    protected jsonValidator: JSONValidator;
    protected readonly getItemOptionsDefault: {
        schema: null;
    };
    constructor(database: AsyncLocalDatabase, jsonValidator: JSONValidator);
    /**
     * Gets an item value in local storage
     * @param key The item's key
     * @returns The item's value if the key exists, null otherwise, wrapped in an RxJS Observable
     */
    getItem<T = any>(key: string, options?: ALSGetItemOptions): Observable<any>;
    /**
     * Sets an item in local storage
     * @param key The item's key
     * @param data The item's value, must NOT be null or undefined
     * @returns An RxJS Observable to wait the end of the operation
     */
    setItem(key: string, data: any): Observable<boolean>;
    /**
     * Deletes an item in local storage
     * @param key The item's key
     * @returns An RxJS Observable to wait the end of the operation
     */
    removeItem(key: string): Observable<boolean>;
    /**
     * Deletes all items from local storage
     * @returns An RxJS Observable to wait the end of the operation
     */
    clear(): Observable<boolean>;
}