import type { RefObject, ReactNode } from 'react';
import React from 'react';
export interface PubSubRegistry {
    /**
     * starts a connection to an iframe child.
     * Returns a destroy() function that will break the connection.
     */
    connect(ref: HTMLIFrameElement): () => void;
}
export declare const pubsubRegistry: React.Context<PubSubRegistry | undefined>;
export declare function createProvider(pubSubContext: PubSubRegistry): ({ children }: {
    children: ReactNode;
}) => React.JSX.Element;
export declare function usePubSub(): PubSubRegistry | undefined;
export declare function usePubSubIframe(ref?: RefObject<HTMLIFrameElement>): void;