export interface CreateApiServerOptions {
    /** Opt-in TCP listener as `host:port` (or `:port` for all interfaces).
     *  Falls back to `CRTRD_TCP` when unset. Absent → unix socket only. */
    tcp?: string;
}
export interface ApiServer {
    /** Tear down both listeners and unlink the socket file. Double-close safe. */
    close(): Promise<void>;
}
/** Create and start the crtrd API server (A-9). Returns immediately with a
 *  `close()` handle; the listeners bind asynchronously (a unix socket's file is
 *  created on `listen`, so its 0600 chmod happens in the listen callback). A
 *  bind failure or a post-listen accept error is emitted and swallowed — it must
 *  NEVER become an unhandled 'error' that crashes the daemon.
 *
 *  NOTE (correction to the plan's "one http.Server bound twice"): a Node
 *  `net.Server`/`http.Server` binds exactly ONE handle — a second `.listen()`
 *  on the same instance throws `ERR_SERVER_ALREADY_LISTEN`. So the two listeners
 *  are two `http.Server` instances SHARING the same request + upgrade handler
 *  functions (the standard way to bind one logical API to two transports). The
 *  Router and attach bridge are process-wide singletons, so both servers route
 *  into identical state. */
export declare function createApiServer(opts?: CreateApiServerOptions): ApiServer;