Can you provide some examples? My experience is that almost any library you end up using is built specifically for React and not vanilla.
with https://github.com/PatrickJS/angular-intercom/blob/master/an...
And that's the small one. There's also https://github.com/CaliStyle/ng-intercom
As another example, consider HTTP. Angular provides its own special HTTP class. With React I just use the standard Fetch API.