import { ReactNode } from 'react';
type Listener = () => void;
type Snapshot = {
    content: ReactNode | null;
    owner: symbol | null;
};
export declare const setPortalContent: (next: ReactNode | null) => void;
export declare const setPortalOwner: (next: symbol) => void;
export declare const clearPortalOwner: (id: symbol) => void;
export declare const getPortalSnapshot: () => Snapshot;
export declare const subscribePortal: (listener: Listener) => (() => void);
export {};