import type { Bud } from '@roots/bud-framework';
/**
 * Overlay
 *
 * @returns Set of client script callbacks
 */
export declare const callback: () => Set<(app: Bud) => false | string>;
/**
 * Proxy click interceptor
 *
 * @param app - Bud instance
 * @returns string
 */
export declare const proxyClickInterceptor: (app: Bud) => string | false;
/**
 * Client
 *
 * @param app - Bud instance
 * @returns string
 */
export declare const hmrClient: (app: Bud) => string | false;