import { ReactNode } from 'react';
type PortalHostProps = {
    children: ReactNode;
    pageId: number;
};
export type Operation = {
    type: 'mount';
    key: number;
    children: ReactNode;
} | {
    type: 'update';
    key: number;
    children: ReactNode;
} | {
    type: 'unmount';
    key: number;
};
declare class PortalGuard {
    private nextKey;
    add: (e: ReactNode, id: number | null) => number;
    remove: (key: number) => void;
    update: (key: number, e: ReactNode) => void;
}
/**
 * portal
 */
export declare const portal: PortalGuard;
declare const PortalHost: ({ children }: PortalHostProps) => JSX.Element;
export default PortalHost;