We're just not there yet. Maybe someday.
If not - then maybe this should help explain how Vanilla JS works ;-) https://en.wikipedia.org/wiki/JavaScript
The only in-built thing really lacking is customizable dialogs, such as HTML modal and modeless dialogs, and starred password input control dialogs.
All of the typical JS packages are available for vanilla-js, like calendar and color pickers.
What's funny is that other developers' ears usually perk up when you mention being a vanilla-js programmer, and often want a demo to see how you can do entire apps without jquery, etc.
in response to https://news.ycombinator.com/item?id=18012334#18017288