import * as iframePhone from "iframe-phone";
import { ClientMessage, ICustomMessagesHandledMap, ISupportedFeaturesRequest, ServerMessage, OnUnloadFunction } from "./types";
import { ManagedState } from "./managed-state";
import { PubSubChannel } from "./pubsub";
export declare const getClient: () => Client;
/**
 * This class is intended to provide basic helpers (like `post()` or `add/removeListener`), maintain client-specific
 * state, and generally be as minimal as possible. Most of the client-specific helpers and logic can be implemented
 * in api.ts or hooks.ts (or both so the client app has choice).
 */
export declare class Client {
    phone: iframePhone.IFrameEndpoint;
    managedState: ManagedState;
    customMessagesHandled: ICustomMessagesHandledMap;
    private listeners;
    private requestId;
    private onUnload;
    constructor();
    getNextRequestId(): number;
    post(message: ClientMessage, content?: any): void;
    addListener(message: ServerMessage, callback: iframePhone.ListenerCallback, requestId?: number): boolean;
    removeListener(message: ServerMessage, requestId?: number, callback?: iframePhone.ListenerCallback): boolean;
    setSupportedFeatures: (request: ISupportedFeaturesRequest) => void;
    setOnUnload: (onUnload?: OnUnloadFunction<{}> | undefined) => void;
    createPubSubChannel(channelId: string, channelInfo?: any): PubSubChannel;
    private connect;
}