import { Eventer, EventerEventListener, EventerEventResponder } from './Eventer';
export declare type MessengerType = 'master' | 'slave';
export declare type Message = {
    channel: string;
    topic: string;
    data: any;
};
export declare class Messenger extends Eventer {
    private listenTo?;
    private emitTo?;
    private type;
    private channel;
    private linkEstablished;
    private postMessageListenerAttached;
    constructor(listenTo?: Window, emitTo?: Window, type?: MessengerType);
    emit(topic: string, data?: any): void;
    on(topic: string, listener: EventerEventListener): void;
    request(topic: string, data?: any, listener?: EventerEventListener): Promise<any>;
    respond(topic: string, responder: EventerEventResponder): void;
    once(topic: string, listener?: EventerEventListener): Promise<any>;
    establishLinkBetweenSlaveAndMaster(): Promise<void>;
    private setupMaster;
    private setupSlave;
    private setupPostMessageListener;
    protected emitMessage(topic: string, payload: any): void;
    protected receiveMessage(topic: string, payload: any): void;
    private receivePostMessage;
    private emitPostMessage;
    private createPostMessage;
    private checkLink;
    private generateChannelId;
    private isPrivateTopic;
}