Ask HN: Why is Microsoft omnichannel (chat widget) over 6MB of JavaScript code?

We where going to add Microsoft omnichannel to our webpage but we discovered that running it, a small chat widget takes up a staggering 6MB of pure javascript code. Anyone known what is going on?

See this example from microsoft.net: https://csimplreslivechatsamples.blob.core.windows.net/$web/AddCustomHeaderButton.html

And the results here: https://i.imgur.com/I77JvjO.png