/// <reference types="node" />
import { EventEmitter } from 'events';
export declare abstract class Storage extends EventEmitter {
    abstract length: number;
    abstract keys: Array<string>;
    abstract setItem(key: string, value: any): boolean;
    abstract getItem(key: string): any;
    abstract removeItem(key: string): boolean;
    abstract key(index: number): string;
    abstract clear(): boolean;
}