/**
 * Please Notice: This file will run in the preview iframe.
 */
import type { BitBaseEvent } from './bit-base-event';
import type { Callback } from './types';
export declare class PubsubPreview {
    private _parentPubsub?;
    private events;
    sub(topic: string, callback: Callback): () => void;
    pub(topic: string, event: BitBaseEvent<any>): void;
    private inIframe;
    private connectToParentPubSub;
    private handleMessageFromParent;
    static runtime: import("@teambit/harmony").RuntimeDefinition;
    static provider(): Promise<PubsubPreview>;
}