[seba_dos1]

It's 2019, most of the stuff that jQuery used to handle is now included in the browser API. For instance, to have "AJAX", simply try window.fetch instead of $.get.

[vertex-four]

Then add a polyfill per api call to support anything but the most recent browsers, if you happen to want your site useable by people with old systems or who are at work.

[seba_dos1]

...which you can selectively serve only to the old browsers :)

[piker]

That sounds trivial.