import type { UiUI } from '@teambit/ui';
import type { BitBaseEvent } from './bit-base-event';
import type { Callback } from './types';
type PubOptions = {
    /** forward the event to adjacent windows (including the preview iframe)  */
    propagate?: boolean;
};
export declare class PubsubUI {
    private childApi?;
    private events;
    /**
     * subscribe to events
     */
    sub: (topic: string, callback: Callback) => () => void;
    /**
     * publish event to all subscribers, including nested iframes.
     */
    pub: (topic: string, event: BitBaseEvent<any>, { propagate }?: PubOptions) => void;
    private connectToIframe;
    getPubSubContext(): ({ children }: {
        children: import("react").ReactNode;
    }) => import("react").JSX.Element;
    /**
     * publish event to all subscribers in this window
     */
    private emitEvent;
    /**
     * publish event to nested iframes
     */
    private pubToChild;
    static runtime: import("@teambit/harmony").RuntimeDefinition;
    static dependencies: import("@teambit/harmony").Aspect[];
    static provider([uiUI]: [UiUI]): Promise<PubsubUI>;
}
export {};