/**
 * Local viewer HTTP server — leaf renderer, reads graph.json only.
 * Binds 127.0.0.1 only; no auth; no scanner imports.
 */
export declare const DEFAULT_VIEWER_PORT = 4577;
export interface ViewerServer {
    url: string;
    port: number;
    /** Push a graph to all SSE clients (Story 3.5). */
    broadcastGraph?(graph: unknown): void;
    /** Push scan error to SSE clients. */
    broadcastScanError?(message: string): void;
    close(): Promise<void>;
}
export interface ViewerServerOptions {
    port?: number;
    /** Enable SSE /events endpoint (Story 3.5). */
    sse?: boolean;
}
export declare function startViewerServer(cwd: string, opts?: ViewerServerOptions): Promise<ViewerServer>;