Since Angular2 is released, many components are published as npm modules and most them have prefix – ng2- or angular2- like ng2-bootstrap, angular2-tags-input.
After releasing Angular4, all those node modules were faced with serious problem – “Do we have to be renamed to ng4 or angular4???”
Here is an answer written by Igor Minar from Angular Core Team.
http://angularjs.blogspot.com/2016/12/ok-let-me-explain-its-going-to-be.html
“It’s just “Angular””
As you can see here, Angular2 and Angular4 are all Angular.
And Upgrading version is not painful anymore like 2 to 4.
Just do ng upgrade or ncu -u -a.
From now angular components should be ngx-something.