How to use the deltachat-node/constants.DC_MSG_FILE function in deltachat-node

sendMessage (chatId, text, filename, opts) {
    const viewType = filename ? C.DC_MSG_FILE : C.DC_MSG_TEXT
    const msg = this._dc.messageNew(viewType)
    if (filename) msg.setFile(filename)
    if (text) msg.setText(text)
    this._dc.sendMessage(chatId, msg)
  }

function convertContentType (message) {
  const filemime = message.filemime

  if (!filemime) return 'application/octet-stream'
  if (filemime !== 'application/octet-stream') return filemime

  switch (message.msg.viewType) {
    case C.DC_MSG_IMAGE:
      return 'image/jpg'
    case C.DC_MSG_VOICE:
      return 'audio/ogg'
    case C.DC_MSG_FILE:
      const type = mime.lookup(message.msg.file)
      if (type) return type
      else return 'application/octet-stream'
    default:
      return 'application/octet-stream'
  }
}

sendMessage (chatId, text, filename, location) {
    const viewType = filename ? C.DC_MSG_FILE : C.DC_MSG_TEXT
    const msg = this._dc.messageNew(viewType)
    if (filename) msg.setFile(filename)
    if (text) msg.setText(text)
    if (location) msg.setLocation(location.lat, location.lng)
    const messageId = this._dc.sendMessage(chatId, msg)
    return [messageId, this.getMessage(messageId)]
  }

`

const GROUPS = {
  images: {
    values: [C.DC_MSG_GIF, C.DC_MSG_IMAGE]
  },
  video: {
    values: [C.DC_MSG_VIDEO]
  },
  audio: {
    values: [C.DC_MSG_AUDIO, C.DC_MSG_VOICE]
  },
  documents: {
    values: [C.DC_MSG_FILE]
  }
}

const DEFAULT_STATE = {
  id: 'images',
  msgTypes: GROUPS.images.values,
  medias: []
}

export default class Media extends React.Component {
  constructor (props) {
    super(props)
    this.state = DEFAULT_STATE
  }

  componentDidMount () {