How to use the tinode-sdk.topicType function in tinode-sdk

handleHashRoute() {
    var hash = HashNavigation.parseUrlHash(window.location.hash);
    if (hash.path && hash.path.length > 0) {
      // Left-side panel selector.
      if (['register','settings','edit','cred','reset','newtpk','archive','contacts',''].includes(hash.path[0])) {
        this.setState({sidePanelSelected: hash.path[0]});
      } else {
        console.log("Unknown sidepanel view", hash.path[0]);
      }

      // Topic for MessagesView selector.
      if (hash.path.length > 1 && hash.path[1] != this.state.topicSelected) {
        this.setState({
          topicSelected: Tinode.topicType(hash.path[1]) ? hash.path[1] : null
        });
      }
    } else {
      // Empty hashpath
      this.setState({sidePanelSelected: ''});
    }

    // Save validation credentials, if available.
    if (hash.params.method) {
      this.setState({ credMethod: hash.params.method });
    }
    if (hash.params.code) {
      this.setState({ credCode: hash.params.code });
    }

    // Additional parameters of panels.

static prepareSearchableContacts(chatList, foundContacts) {
    let merged = {};

    // For chatList topics merge only p2p topics and convert them to the
    // same format as foundContacts.
    for (const c of chatList) {
      if (Tinode.topicType(c.topic) == 'p2p') {
          merged[c.topic] = {
            user: c.topic,
            updated: c.updated,
            public: c.public,
            private: c.private,
            acs: c.acs
          };
      }
    }

    // Add all foundCountacts if they have not been added already.
    for (const c of foundContacts) {
      if (!merged[c.user]) {
        merged[c.user] = c;
      }
    }

render() {
    let avatar;
    if (this.props.avatar === true) {
      const isGroup = (Tinode.topicType(this.props.topic) == 'grp');
      const iconColor = (isGroup ? 'light-color' : 'dark-color')
        + (Math.abs(stringHash(this.props.topic)) % 16);
      if (this.props.topic && this.props.title && this.props.title.trim()) {
        const letter = this.props.title.trim().charAt(0);
        const className = 'lettertile ' + iconColor;
        avatar = (<div><div>{letter}</div></div>)
      } else {
        const className = 'material-icons ' + iconColor;
        avatar = isGroup ?
          <i>group</i> : <i>person</i>;
      }
    } else if (this.props.avatar) {
      // If avatar image is invalid, show a placeholder.
      avatar = <img src="{this.props.avatar}" alt="avatar">{e.target.onerror = null; e.target.src="/img/broken_image.png"}} /&gt;;
    } else {

mimeType={msg.head ? msg.head.mime : null}
            timestamp={msg.ts} response={isReply} seq={msg.seq}
            userFrom={userFrom} userName={userName} userAvatar={userAvatar}
            sequence={sequence} received={deliveryStatus} uploader={msg._uploader}
            viewportWidth={this.props.viewportWidth}
            showContextMenu={this.handleShowContextMenuMessage}
            onImagePreview={this.handleImagePreview}
            onFormResponse={this.handleFormResponse}
            onError={this.props.onError}
            key={msg.seq} />
        );
      }

      let lastSeen = null;
      const cont = this.props.tinode.getMeTopic().getContact(this.state.topic);
      if (cont && Tinode.topicType(cont.topic) == 'p2p') {
        if (cont.online) {
          lastSeen = formatMessage(messages.online_now);
        } else if (cont.seen) {
          lastSeen = formatMessage(messages.last_seen) + ": " +
            shortDateFormat(cont.seen.when, this.props.intl.locale);
          // TODO: also handle user agent in c.seen.ua
        }
      }
      const avatar = this.state.avatar || true;
      const online = this.props.online ? 'online' + (this.state.typingIndicator ? ' typing' : '') : 'offline';

      component = (
        <div id="topic-view">
          <div id="topic-caption-panel">
            {this.props.displayMobile ?
              <a id="hide-message-view" href="#"> {e.preventDefault(); this.props.onHideMessagesView();}}&gt;</a></div></div>