class LocalDataTrack {
  constructor() {
    this.dataChannelMessages = []
    this.builded = false
  }

  build(janusRoom) {
    this.janusRoom = janusRoom
  }

  send(data) {
    if (!this.janusRoom) {
      this.dataChannelMessages.push(data)
    }
    else {
      if (!this.builded) {
        this.janusRoom._dataChannelMessages.push(...this.dataChannelMessages)
        this.dataChannelMessages = []
        this.builded = true
      }
      this.janusRoom._sendData(data)
    }
  }
}

class JanusRoom {
  constructor(newRoom) {
    if (typeof newRoom === 'undefined') {
      throw new Error('need to use build(token, connectOptions)')
    }
    this.janusRoom = newRoom
    JanusRoom.LocalVideoTrack.build(newRoom)
  }
}

room = JanusRoom()
localDataTracks.forEach(localDataTrack => localDataTracks.build(room))