/**
 * Serve packaged Web UI (SPA) from disk next to API.
 */
import type { IncomingMessage, ServerResponse } from 'node:http';
/** SPA CSP. File preview uses blob: URLs for video/audio/PDF. */
export declare const SPA_CONTENT_SECURITY_POLICY: string;
/**
 * Resolve default web dist:
 * - YSK_WEB_ROOT env
 * - monorepo apps/web/dist relative to server package
 * - sibling web/dist for packaged installs
 */
export declare function resolveWebRoot(explicit?: string): string | null;
/**
 * Try to serve a static file or SPA index. Returns true if response was written.
 */
export declare function tryServeStatic(req: IncomingMessage, res: ServerResponse, urlPathname: string, webRoot: string | null): boolean;
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