import type { Element } from './element.js';
export declare class ClassList extends Set<string> {
    private el;
    constructor(className: string, el: Element);
    get value(): string;
    add(s: string): this;
    get length(): number;
    remove(s: string): void;
    toggle(s: string): void;
    replace(s1: string, s2: string): void;
    contains(s: string): boolean;
    toString(): string;
    private _update;
}