/**
 * Preview UI — local HTTP server for editing store assets after generation.
 *
 * Uses only Node built-ins (http, fs) — no express, no framework, no extra
 * dependencies. Run via the `store-asset-generator-preview` bin command.
 *
 *   $ npx store-asset-generator-preview ./store-assets
 *
 * Serves:
 *   GET  /                      → ui.html
 *   GET  /api/config            → config.json
 *   POST /api/config            → update config.json
 *   GET  /api/mockups           → list of mockup files
 *   GET  /mockups/:relative     → stream a mockup PNG
 *   POST /api/regenerate        → re-render a mockup with new HTML/params
 */
export interface PreviewServerOptions {
    assetsDir: string;
    port?: number;
}
export declare function startPreviewServer(options: PreviewServerOptions): Promise<{
    port: number;
    url: string;
    close: () => void;
}>;
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