import { ValueAccessorBase } from './value-accessor-base';
export declare abstract class ValueAccessorSingle<TValue, TElement extends HTMLElement> extends ValueAccessorBase<TValue, TElement> {
    protected _element: TElement | null;
    get elements(): ReadonlySet<TElement>;
    protected get requiredElement(): TElement;
    attach(el: TElement): void;
    detach(el: TElement): void;
}