import { Candidate, Conference, Transport } from './types';
export declare class SdpBuilder {
    #private;
    get lines(): string[];
    join(): string;
    finalize(): string;
    private add;
    private push;
    private addJoined;
    addCandidate(c: Candidate): void;
    addHeader(sessionId: number): void;
    addTransport(transport: Transport): void;
    addSsrcEntry(transport: Transport): void;
    addConference(conference: Conference): void;
    static fromConference(conference: Conference): string;
}