/**
 * Direct host box model (`ui-direct-host-box`).
 * Chip hosts opt into `display: contents`; block surfaces keep a real layout box.
 */
import type { ComponentCtor } from './dom-core.types.js';
export declare const INLINE_HOST_CONTENTS: ReadonlySet<string>;
export declare function resolveDirectHostBox(name: string, Ctor: ComponentCtor | null | undefined): 'contents' | 'block';
/** Apply host box to a live DOM element (create / hydrate / resume). */
export declare function applyDirectHostBox(host: HTMLElement, name: string, Ctor: ComponentCtor | null | undefined): void;
/** SSR attrs fragment for host box (only when contents). */
export declare function directHostBoxStyleAttr(name: string, Ctor: ComponentCtor | null | undefined): string | null;