import { IWebchatConfiguration, IWebchatState } from "./types/webchat";
import Base from "./client/base";
import Websocket from "isomorphic-ws";
type Unsubscribe = () => void;
interface WebchatEventMap {
    open: undefined;
    closed: undefined;
    error: unknown;
    text: string;
    message: any;
    update: any;
    unknown: any;
}
interface IWebchatPublic {
    state: IWebchatState;
    start: (config: IWebchatConfiguration) => Promise<Websocket>;
    stop: () => void;
    on<K extends keyof WebchatEventMap>(event: K, handler: (data: WebchatEventMap[K]) => void): Unsubscribe;
    on(event: string, handler: (data: any) => void): Unsubscribe;
    off<K extends keyof WebchatEventMap>(event: K, handler: (data: WebchatEventMap[K]) => void): void;
    off(event: string, handler: (data: any) => void): void;
}
declare class Webchat extends Base implements IWebchatPublic {
    state: IWebchatState;
    private connectionUrl;
    private websocket;
    private wsSettings;
    private lastActivityAt;
    private keepAliveInterval;
    private audioContext;
    private micStream;
    private sourceNode;
    private micNode;
    private sinkGain;
    private playbackLead;
    private nextPlaybackTime;
    private pendingSources;
    private downstreamSampleRate;
    private listeners;
    constructor(options: any);
    private params;
    start(config: IWebchatConfiguration): Promise<Websocket>;
    private create;
    stop(): void;
    private keepAlive;
    private setActivity;
    private initAudioWorklet;
    private teardownAudio;
    private float32ToPCM16;
    private pcm16ToFloat32;
    private playPcm;
    on<K extends keyof WebchatEventMap>(event: K, handler: (data: WebchatEventMap[K]) => void): Unsubscribe;
    on(event: string, handler: (data: any) => void): Unsubscribe;
    off<K extends keyof WebchatEventMap>(event: K, handler: (data: WebchatEventMap[K]) => void): void;
    off(event: string, handler: (data: any) => void): void;
    private emit;
}
export type { IWebchatPublic, WebchatEventMap };
export default Webchat;