function successHandler()

in customer/src/customer/index.js [104:182]
52 lines of code
7 McCabe index (conditional complexity)

function successHandler(chatSession) {
  // chat connected
  windowAny.chatSession = chatSession;
  $('#divSpinner').fadeOut(200);
  $('#chatWrapper').fadeIn(400);

  //Change the incoming data set
  chatSession.incomingItemDecorator = function(item) {
    if (['SYSTEM_MESSAGE'].indexOf(item.displayName) !== -1) {
      item.displayName = 'System Message';
    }
    if (chatSession.transcript.length > 0) {
      var transcriptItem = chatSession.transcript[chatSession.transcript.length - 1];
      if (transcriptItem.transportDetails.direction === 'Incoming') {
        var chatDescription = 'This is a demo of a customer chat experience.';
        var name = transcriptItem.displayName;
        if (
          ['prod', '$LATEST', 'AI Assistant', 'SYSTEM_MESSAGE', 'System Message'].indexOf(name) ===
          -1
        ) {
          chatDescription = 'You are now chatting with ' + name;
        }
        document.getElementById('chatDescription').innerHTML = chatDescription;
      }
    }
    return item;
  };

  chatSession.onIncoming(async function(data) {
    if(
      data['Content'] &&
      typeof data['Content'] === 'string'
    ) {
      if(data['Content'].startsWith('Meeting')) {
        $('span:contains("Meeting")').parent().parent().hide();
        $('.header-wrapper').next().css('visibility', 'visible');
        meeting = JSON.parse(data['Content'].replace('Meeting Info: ', ''));
        setTimeout(() => {
          $('span:contains("Meeting")').parent().parent().hide()
          $('span:contains("Let")').parent().parent().hide();
          $('.header-wrapper').next().css('visibility', 'visible');
        }, 500);
      } else if(data['Content'].startsWith('CustomerAttendee')) {
        $('span:contains("CustomerAttendee")').parent().parent().hide();
        $('.header-wrapper').next().css('visibility', 'visible');
        customerAttendee = JSON.parse(data['Content'].replace('CustomerAttendee Info: ', ''));
        setTimeout(() => {
          $('span:contains("CustomerAttendee")').parent().parent().hide()
          $('span:contains("Let")').parent().parent().hide();
          $('.header-wrapper').next().css('visibility', 'visible');
        }, 500);
      }   
    }

    if (meeting && customerAttendee) {
      domShow('meeting-info');
    }
  });

  chatSession.onChatDisconnected(function(data) {
    console.log('Chat disconnected');
    leave();
  });

  windowAny.connect.ChatInterface.init({
    containerId: 'root',
    headerConfig: {
      isHTML: true,
      render: () => {
        return `
                <div class="header-wrapper">
                  <h2 class="welcome-text">Chat Demo</h2>
                  <p id="chatDescription">This is a demo of interacting with a Lex bot.</p>
                </div>
              `;
      },
    },
  });
}