export type PortalLayer = 'alert' | 'default';
/**
 * Initialize portal containers.
 * This function can be called manually in your app's entry point,
 * or it will be called automatically when the first Portal is rendered.
 *
 * @param rootSelector - Optional root element or selector string.
 *                       Defaults to document.body
 */
export declare function initializePortals(rootSelector?: string | HTMLElement): void;
export declare function getContainer(layer: PortalLayer): HTMLElement | null;
export declare function getRootElement(): HTMLElement | null;
/**
 * Reset portal system state. Only for testing purposes.
 * @internal
 */
export declare function resetPortals(): void;