import { IWebrtcTextSimple } from "../type";
import SignalSimple from "./signal-simple";
export default class WebRtcTextSimple {
    private _peerConnection?;
    private _pcConfig?;
    private _signal?;
    private _imageElement?;
    private buildTextOfferMessage?;
    private buildTextCandidateMessage?;
    private _imageStreamChannel?;
    private readonly _earlyCandidates;
    constructor(option: IWebrtcTextSimple);
    peerConnection(): RTCPeerConnection | undefined;
    setSignal: (signal: SignalSimple) => void;
    get imageStreamChannel(): RTCDataChannel | undefined;
    private _gatherCandidate;
    private _handleCreateOffer;
    initPeer: () => void;
    handleReceiveAnswer: (descriptionInitDict: RTCSessionDescriptionInit) => void;
    handleReceiveCandidate: (candidate: any) => void;
    requestImageChannel: () => void;
}