/**
 * Announce this bundle's SDK capabilities to the host: immediately, and again
 * whenever the host posts `lightdash:sdk:ready` — whichever side mounts first,
 * the host ends up with a manifest. The host dedupes repeats.
 *
 * One listener per bundle: the manifest is module-constant, so re-creating the
 * transport re-posts instead of stacking duplicate listeners. Returns a
 * cleanup that unregisters the listener.
 */
export declare function announceSdkManifest(targetWindow: Window): () => void;