Photon Chat JavaScript SDK custom authentication

main.js

/// <reference path="photon/Photon-Javascript_SDK.d.ts"/>

class ChatDemo extends Photon.Chat.ChatClient {
  constructor() {
    super(Photon.ConnectionProtocol.Ws, 'MY_APP_ID', '1.0');

    const type = Photon.LoadBalancing.Constants.CustomAuthenticationType.Custom;
    this.setCustomAuthentication('', type, {
      '(string)message': 'some_data',
      '(string)signature':'some_other_data'
    });
  }
}

window.onload = () => {
  new ChatDemo().connectToRegionFrontEnd('EU');
};