import { AppSurfaceHandle } from './types';
/**
 * Both {@link AppShell} and {@link Window} publish {@link AppSurfaceHandle}
 * here so subtree controls can call {@link useAppSurface} without a ref.
 * `null` outside both so the hook can throw.
 */
export declare const AppSurfaceContext: import('react').Context<AppSurfaceHandle | null>;