import './utils/disposable';
import type { Unsubscribe } from './types';
export declare class MessageBus implements Disposable {
    private readonly tabId;
    private channel;
    private listeners;
    private pendingRequests;
    constructor(channelName: string, tabId: string);
    subscribe<T>(topic: string, fn: (data: T) => void): Unsubscribe;
    publish<T>(topic: string, data: T): void;
    broadcast<T>(topic: string, data: T): void;
    request<T, R>(topic: string, data: T, timeout?: number): Promise<R>;
    respond<T, R>(topic: string, fn: (data: T) => R | Promise<R>): Unsubscribe;
    private handleMessage;
    private postMessage;
    private createMessage;
    private addListener;
    private removeListener;
    [Symbol.dispose](): void;
}