import type { ReactiveControllerHost } from 'lit';
import { ToggleableController } from '../togglable.controller';
export type BoundaryControllerHost = ReactiveControllerHost & HTMLElement;
export declare class BoundaryController extends ToggleableController<BoundaryControllerHost> {
    #private;
    constructor(host: BoundaryControllerHost, active?: boolean);
    activate(): void;
    deactivate(): void;
}